Population Structure and Growth of Walleye in Gregoire, Ethel, and Hilda Lakes, Alberta, 2007 CONSERVATION REPORT SERIES
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Population Structure and Growth of Walleye in Gregoire, Ethel, and Hilda Lakes, Alberta, 2007 Brendan Ganton Alberta Conservation Association 101, 9 Chippewa Rd Sherwood Park, Alberta, Canada T8A 6J7
Report Editors PETER AKU KELLEY KISSNER Alberta Conservation Association 50 Tuscany Meadows Cres NW 101, 9 Chippewa Rd Calgary, AB T3L 2T9 Sherwood Park, AB T8A 6J7 Conservation Report Series Type Data ISBN printed: 978 0 7785 7727 0 ISBN online: 978 0 7785 7728 7 Publication No.: T/197 Disclaimer: This document is an independent report prepared by the Alberta Conservation Association. The authors are solely responsible for the interpretations of data and statements made within this report. Reproduction and Availability: This report and its contents may be reproduced in whole, or in part, provided that this title page is included with such reproduction and/or appropriate acknowledgements are provided to the authors and sponsors of this project. Suggested Citation: Ganton, B.P. 2008. Population structure and growth of walleye in Gregoire, Ethel, and Hilda lakes, Alberta, 2007. Data report, D 2008 006, produced by the Alberta Conservation Association, Sherwood Park, Alberta, Canada. 19 pp + App. Cover photo credit: David Fairless Digital copies of conservation reports can be obtained from: Alberta Conservation Association 101, 9 Chippewa Rd Sherwood Park, AB T8A 6J7 Toll Free: 1 877 969 9091 Tel: (780) 410 1999 Fax: (780) 464 0990 Email: info@ab conservation.com Website: www.ab conservation.com i
EXECUTIVE SUMMARY High angling pressure, coupled with slow growing and late maturing fish, have put Alberta s walleye population under stress. By 1990, many walleye populations in Alberta had declined to a small fraction of their former abundance. To forestall extirpation of these populations and collapse of associated recreational fisheries, Alberta Sustainable Resources Development introduced the Alberta Walleye Management and Recovery Plan (WMRP) in 1995. As part of the WMRP, I conducted gill netting surveys at Gregoire, Ethel, and Hilda lakes during the fall of 2007 to obtain information on the abundance and population structure of walleye in these lakes. Data from Gregoire Lake suggested that in 2007 the walleye population had a broad age class distribution that was moderately unstable. The average walleye reached 500 mm FL at age 14. Male walleye reached maturity at age 4, whereas female walleye reached maturity at age 6. The catch rate of walleye was 11.8 walleye/100 m 2 /24 h. Data from Ethel Lake suggested that in 2007 the walleye population had a broad ageclass distribution that was moderately unstable. The average walleye reached 500 mm FL at age 13. Male walleye reached maturity at age 4, whereas female walleye reached maturity at age 7. The catch rate of walleye was 14.6 walleye/100 m 2 /24 h. Data from Hilda Lake suggested that in 2007 the walleye population had a narrow and unstable age class distribution. The average walleye reached 500 mm FL at age 13. Male and female walleye both reached maturity at age 5. The catch rate of walleye was 15.1 walleye/100 m 2 /24 h. ii
ACKNOWLEDGEMENTS Financial support for this study was provided by the Alberta Conservation Association. Alberta Sustainable Resources Development provided in kind support, campground and sampling facilities. iii
TABLE OF CONTENTS EXECUTIVE SUMMARY... ii ACKNOWLEDGEMENTS... iii TABLE OF CONTENTS... iv LIST OF FIGURES... v LIST OF APPENDICES... vi 1.0 INTRODUCTION...1 2.0 STUDY AREAS...1 2.1 Gregoire Lake...1 2.2 Ethel Lake...2 2.3 Hilda Lake...2 3.0 MATERIALS AND METHODS...6 3.1 Sampling design...6 3.2 Biological data...7 3.3 Data analysis...7 4.0 RESULTS...9 4.1 Capture data...9 4.2 Walleye population structure...9 4.3 Stock assessment summaries...17 5.0 LITERATURE CITED...18 6.0 APPENDICES...20 iv
LIST OF FIGURES Figure 1. Map of Gregoire Lake, Alberta showing sampling sites... 3 Figure 2. Map of Ethel Lake, Alberta showing sampling sites... 4 Figure 3. Map of Hilda Lake, Alberta showing sampling sites... 5 Figure 4. class distribution of walleye from Gregoire Lake, Alberta, 2007... 10 Figure 5. Length at age relationship for walleye from Gregoire Lake, Alberta, 2007.11 Figure 6. at maturity of male walleye from Gregoire Lake, Alberta, 2007... 11 Figure 7. at maturity of female walleye from Gregoire Lake, Alberta, 2007.... 12 Figure 8. class distribution of walleye from Ethel Lake, Alberta, 2007... 13 Figure 9. Length at age relationship for walleye from Ethel Lake, Alberta, 2007... 13 Figure 10. at maturity of male walleye from Ethel Lake, Alberta, 2007.... 14 Figure 11. at maturity of female walleye from Ethel Lake, Alberta, 2007... 14 Figure 12. class distribution of walleye from Hilda Lake, Alberta, 2007... 15 Figure 13. Length at age relationship for walleye from Hilda Lake, Alberta, 2007... 16 Figure 14. at maturity of male walleye from Hilda Lake, Alberta, 2007... 16 Figure 15. at maturity of female walleye from Hilda Lake, Alberta, 2007... 17 v
LIST OF APPENDICES Appendix 1. Appendix 2. Appendix 3. Appendix 4. Appendix 5. Appendix 6. Appendix 7. Appendix 8. Appendix. 9. Appendix 10. Appendix 11. Appendix. 12. Net location, set and inspection times for the survey of Gregoire Lake, Alberta, 2007.... 20 Net location, set and inspection times for the survey of Ethel Lake, Alberta, 2007.... 21 Net location, set and inspection times for the survey of Hilda Lake, Alberta, 2007.... 21 Biological data collected from walleye during the survey of Gregoire Lake, Alberta, 2007... 22 Biological data collected from non target fish species during the survey of Gregoire Lake, Alberta, 2007... 30 Standardized probability density function of walleye catch rate from Gregoire Lake, Alberta, 2007... 38 Biological data collected from walleye during the survey of Ethel Lake, Alberta, 2007... 39 Biological data collected from non target fish species during the survey of Ethel Lake, Alberta, 2007.... 44 Standardized probability density function of walleye catch rate from Ethel Lake, Alberta, 2007... 50 Biological data collected from walleye during the survey of Hilda Lake, Alberta, 2007... 51 Biological data collected from non target fish species during the survey of Hilda Lake, Alberta, 2007..... 56 Standardized probability density function of walleye catch rate from Hilda Lake, Alberta, 2007... 64 vi
1.0 INTRODUCTION Angling pressure on sport fish in Alberta, particularly walleye (Sander vitreus), has been increasing for many years. A large number of licensed anglers, relatively few lakes, and slow growing, late maturing fish have put Alberta s walleye population under stress (Sullivan 2003). By 1990, relatively unrestricted fishing pressure on walleye across Alberta had caused many walleye populations to decline to a small fraction of their former abundance (Sullivan 2003). To recover and protect exploited walleye populations, Alberta Sustainable Resource Development (ASRD) created the Alberta Walleye Management and Recovery Plan (WMRP) in 1995. Under the WMRP, lakes were classified into one of four general categories based on the state of the walleye fishery. The four categories included: collapsed, vulnerable, stable, and trophy (Berry 1995). Using this classification, each lake was assigned a corresponding sport fishing regulation (Sullivan 2003). As part of the WMRP, I conducted gill netting surveys at Gregoire, Ethel, and Hilda lakes during the fall of 2007 to obtain information on the abundance and population structure of walleye in these lakes. The information collected in these surveys will allow ASRD to evaluate the effect of current sport fish regulations on the fisheries at these lakes and will inform future management decisions. Based on WMRP criteria, the walleye fisheries in both Ethel and Gregoire lakes are classified as collapsed, and both lakes are managed (since 1996 for Ethel and 1998 for Gregoire) with a zero walleye possession limit (catch and release only) regulation. The Hilda Lake walleye fishery is currently classified as vulnerable, and since 2004 has been managed with a one walleye possession and 500 mm minimum total length (TL) regulation. 2.0 STUDY AREAS 2.1 Gregoire Lake Gregoire Lake (56 27ʹ N 110 09ʹ W) is located within the Athabasca River drainage, approximately 350 km northeast of Edmonton and 30 km southeast of Fort McMurray, Alberta (Figure 1). It has a surface area of 2,580 ha, a mean depth of 3.9 m and a maximum depth of 7.2 m. It is primarily fed by several small creeks on the southwest 1
and is drained by the Gregoire River, which flows from the southeast into the Clearwater River (Mitchell and Prepas 1990). Gregoire Lake can be accessed from secondary Highway 881 east of Highway 63. There is considerable development around the lake. The Hamlet of Anzac is located on the east shore of the lake and includes a provincial day use area with informal boat launch. The largest recreational development is Gregoire Lake Provincial Park located on the northwest shore. There are three treaty reserves, Gregoire Lake Reserves 176, 176a, and 176b, located on the south and northeast shores. An Amoco in situ oil plant is located within reserve 176 and a large oil sands development (Long Lake Project) is being constructed east of the lake (Swanson and Zurawell 2006). 2.2 Ethel Lake Ethel Lake (54 32ʹ N 110 21ʹ W) is located in the Beaver River drainage, approximately 225 km northeast of Edmonton and 18 km northwest of Cold Lake, Alberta (Figure 2). It has a surface area of 490 ha, a mean depth of 6.6 m and a maximum depth of 30 m. The major inflows to the lake are Marie Creek on the north shore and an unnamed creek that flows in from Hilda Lake on the southwest shore. The lake is drained by Marie Creek on the southeast shore. Ethel Lake can be reached by either Ethel Lake Road or Primrose Lake Road north of Highway 55, which provides access to a provincial recreation area located on the northeast shore of the lake. The recreation area contains 14 campsites, a day use area and a boat launch. There is a small cottage development and a few permanent residences on the northeast side of the lake adjacent to the recreation area (Mitchell and Prepas 1990). 2.3 Hilda Lake Hilda Lake (54 31ʹ N 110 25ʹ W) is located within the Beaver River drainage, approximately 220 km northeast of Edmonton and 20 km northwest of Cold Lake, Alberta (Figure 3). Hilda Lake has a surface area of 356 ha, a mean depth of 6.2 m and a maximum depth of 14 m. It is fed by several small creeks on the west shore and is drained by an outflow on the east shore, which empties into Ethel Lake. The lake is accessed by Ethel Lake Road north of Highway 55, which leads to an unimproved boat launch on the southeast shore. There is a small cottage development on the east side of the lake. 2
Figure 1. Map of Gregoire Lake, Alberta showing sampling sites. Inset is map of Alberta showing the location of the lake within the province. 3
Figure 2. Map of Ethel Lake, Alberta showing sampling sites. Inset is a map of Alberta showing the location of the lake within the province. 4
Figure 3. Map of Hilda Lake, Alberta showing sampling sites. Inset is map of Alberta indicating the location of the lake within the province. 5
3.0 MATERIALS AND METHODS 3.1 Sampling design I examined relative abundance and population structure of walleye in Gregoire, Ethel and Hilda lakes between 11 and 22 September 2007 using a modified (see Sullivan and Park 2004) Fall Walleye Index Netting (FWIN) protocol developed by the Ontario Ministry of Natural Resources (Morgan 2000). Under this protocol, demographic data on walleye populations were collected over a short time period (e.g., 3 d) during the fall season. By ensuring that surveys were completed within a narrow time frame and under moderate water temperatures (10 15 C), the FWIN approach provides snapshots of population structure while minimizing complications associated with long term or seasonal variations in growth and age of fish (Morgan 2000). FWIN catch data were validated as an appropriate index of walleye abundance using population density estimates and angler total catch rate data (Sullivan and Park 2004). I used 1.8 m deep by 61 m long multi panel monofilament gill nets to capture walleye. Each net consisted of eight, 7.6 x 1.8 m panels of different mesh sizes: 25, 38, 51, 64, 76, 102, 127, and 152 mm stretched mesh. Sampling effort was determined by monitoring sampling precision and biological sample size. For this assessment, achieving a 20% level of standard error between catches or a biological sample size of approximately 200 walleye was considered adequate following Morgan (2000). However, the standard error between catches was monitored and if a 20% level was not achieved with the prescribed effort and biological sample size, netting was stopped and the existing level of standard error was used. To ensure uniform catchability, I used a stratified random design to select sampling sites at each lake, using depth zones (shallow 2 5 m and deep 5 15 m) and surface area as strata. I divided the surface of each lake into 1 km 2 sampling units corresponding to a Universal Transverse Mercator (UTM) grid. Each UTM grid was then sub divided into four 0.25 km 2 quadrats. Sampling sites were located within a randomly selected quadrat from a randomly selected UTM grid (i.e., both grids and quadrats were randomly selected). I used bathymetric data to calculate a ratio of surface area between the two depth strata following procedures in Morgan (2000), and 6
used this ratio to allocate number of nets proportionally to the two depth strata. Nets were set in the centre of each randomly selected quadrat, whenever possible, or within 250 m of the centre. To reduce potential sampling bias from variation in the lake habitat, areas along steep gradients, drop offs, or heavy vegetation were avoided. If the desired depth or suitable topography was not found within 250 m of the selected quadrat centre, that quadrat was replaced with the next randomly selected quadrat in the sequence. To reduce effects of local fish depletion, nets were set no less than 500 m apart. For each lake, I set nets on consecutive days. Soak time per net was approximately 24 h (range = 21 27 h) per set period. Based on this sampling design, 18 nets (13 shallow and 5 deep) were set in Gregoire Lake between 11 and 13 September 2007 for an average net soak time of 23.3 h per set period (range = 21.9 26.4 h; Appendix 1). Nine nets (4 shallow and 5 deep) were set in Ethel Lake between 19 and 21 September 2007 for an average net soak time of 23.4 h per set period (range = 22.5 24.8 h; Appendix 2). Nine nets (3 shallow and 6 deep) were set in Hilda Lake between 19 and 21 September 2007 for an average net soak time of 23.8 h per set period (range = 23.2 24.5 h; Appendix 3). 3.2 Biological data I recorded the species and number of all fish caught, and bagged fish separately by mesh size (i.e., by panel) for each net. I collected data on fork length (FL) and TL (± 1 mm), total weight (± 1 g), sex and state of maturity. Fish were described as sexually mature if they appeared able to spawn during the next spawning season (Duffy et al. 2000). To determine age of walleye, I collected otoliths and the first three rays of the left pelvic fin. s were determined according to Mackay et al. (1990). 0 walleye were determined from fork length (FL), with walleye < 130 mm recorded as age 0. 3.3 Data analysis I plotted weight length and length age relationships to identify and investigate any outliers. Outliers were omitted if measurement or recording error was suspected. To aid in classifying the state of the walleye fishery, I examined age class distributions, length at age, and age at maturity relationships from net catches. at maturity was determined as the age at which 50% of fish were mature. Following the WMRP, 7
evaluation of demographic attributes (e.g., growth rate, age at maturity, etc.) was based on fish 500 mm FL. I described growth rate using the von Bertalanffy (1938) growth model: L t = L (1 e K (t t ) 0 where, Lt = length at age t, L = maximum theoretical length that can be attained, K = coefficient of growth, t = age, in years, and t0 = theoretical time, in years, when the fish was size zero. ) L, K, and t0 were calculated using the Fishery Analysis and Simulation Tools ver. 3.0 (Slipke and Maceina 2006). The length at age data were fitted to the growth model by applying the equation independently to each average FL per age class. Following Sullivan (1994) and Berry (1995), walleye length at age data were plotted as FL at a given age. I used a bootstrap technique to estimate mean catch rate of walleye (expressed as fish/100 m 2 /24 h) and associated 95% confidence intervals (CI) following procedures in Haddon (2001) and Sullivan (2004). All data collected were stored in the Fisheries Management Information System (FMIS) maintained by ASRD under Project IDs 7676 (Gregoire Lake), 7701 (Hilda Lake), and 7681 (Ethel Lake). 8
4.0 RESULTS 4.1 Capture data 4.1.1 Gregoire Lake Nets set at Gregoire Lake captured 234 walleye (Appendix 4). Also captured were 83 yellow perch (Perca flavescens), 114 northern pike (Esox lucius), 55 lake whitefish (Coregonus clupeaformis), 62 cisco (Coregonus artedi), 34 white sucker (Catostomus commersoni), eight spottail shiner (Notropis hudsonius), and one trout perch (Percopsis omiscomaycus) (Appendix 5). Estimated catch rate of walleye was 11.8 fish/100 m 2 /24 h (95% CI = 8.7 16.6, n = 18; Appendix 6). 4.1.2 Ethel Lake Nets set at Ethel Lake captured 134 walleye (Appendix 7). Also captured were 101 yellow perch, 134 northern pike, 12 lake whitefish, 26 cisco, and 29 white sucker (Appendix 8). Estimated catch rate of walleye was 14.0 walleye/100 m 2 /24 h (95% CI = 9.0 19.0, n = 9; Appendix 9). 4.1.3 Hilda Lake Nets set at Hilda Lake captured 149 walleye (Appendix 10). Also captured were 139 yellow perch, 48 northern pike, 42 cisco, and 19 white sucker (Appendix 11). Estimated catch rate of walleye was 15.1 walleye/100 m 2 /24 h (95% CI = 10.1 19.8, n = 9; Appendix 12). 4.2 Walleye population structure 4.2.1 Gregoire Lake Walleye from Gregoire Lake displayed a broad age class distribution with a mean (± SE) age of 8.9 ± 0.3 y (n = 233). Based on WMRP criteria, the age class distribution was moderately unstable. Strong year classes were ages 1, 3, 10 and 13, and ages 7, 8, 14 and 18 fish were nearly absent from the catch. Overall, older fish (> 15 y) were poorly represented in the catch (Figure 4). 9
Catch rate (walleye/100 m 2 /24 h) 2.5 2.0 1.5 1.0 0.5 0.0 0 4 8 12 16 20 Figure 4. class distribution of walleye from Gregoire Lake, Alberta, 2007. The Gregoire walleye fishery was likely composed of slow or very slow growing fish. Estimated average maximum size (L ) of walleye from the von Bertalanffy growth function was 509.0 mm, with a growth coefficient K = 0.279, and t0 = 0.82. Based on these estimates, the average walleye from Gregoire Lake would reach 500 mm FL (the WMRP standard size) at age 14. The youngest walleye observed to reach 500 mm FL was age 9 (Figure 5). Gregoire Lake walleye appeared to be early maturing (< 8 y). Of 222 walleye examined in 2007, 42% (n = 93) were mature males and 34% (n = 75) were mature females; the remaining walleye were immature. Male walleye matured at age 4 (Figure 6) and female walleye matured at age 6 (Figure 7). 10
700 600 500 400 300 200 100 0 age and length von Betalanffy growth curve 0 4 8 12 16 20 Figure 5. Length at age relationship for walleye from Gregoire Lake, Alberta, 2007. The von Bertalanffy growth curve is shown by the solid line. K = 0.279, t0 = 0.82, L = 509.0 mm FL, n = 233. Catch rate (walleye/100 m 2 /24 h) 1.5 1.0 0.5 0.0 Immature males Mature males 0 4 8 12 16 20 Figure 6. at maturity of male walleye from Gregoire Lake, Alberta, 2007 (n = 114). 11
Catch rate (walleye/100 m 2 /24 h) 1.5 1.0 0.5 0.0 Immature females Mature females 0 4 8 12 16 20 Figure 7. at maturity of female walleye from Gregoire Lake, Alberta, 2007 (n = 108). 4.2.2 Ethel Lake Walleye from Ethel Lake displayed a broad age class distribution with a mean (± SE) age of 8.5 ± 0.4 y (n = 129). Based on WMRP criteria, the age class distribution was moderately unstable with high catches of ages 4, 9 and 17 walleye, and moderate catches of ages 2 to 6, 10 and 11 walleye. Very few young of year (YOY) and age 1 walleye were caught, and no walleye ages 12 to 15 were captured (Figure 8). The Ethel Lake walleye fishery was likely composed of slow or very slow growing fish. The youngest walleye sampled from Ethel Lake to reach 500 mm FL was age 9. The average walleye was predicted to reach 500 mm FL at approximately age 13 (Figure 9). 12
Catch rate (walleye/100 m 2 /24 h) 3.0 2.5 2.0 1.5 1.0 0.5 0.0 0 4 8 12 16 20 Figure 8. class distribution of walleye from Ethel Lake, Alberta, 2007. Mean (± SE) age was 8.5 ± 0.4 y, n = 129. 700 600 500 400 300 200 100 0 age and length von Betalanffy growth curve 0 4 8 12 16 20 Figure 9. Length at age relationship for walleye from Ethel Lake, Alberta, 2007. The von Bertalanffy growth curve is shown by the solid line. K = 0.188, t0 = 1.232, L = 551.5 mm, n = 129. 13
Ethel Lake walleye appeared to be early maturing (< 8 y). Of 128 walleye examined in 2007, 56% (n = 72) were mature males and 16% (n = 21) were mature females; the remaining walleye were immature. Male walleye matured at age 4 (Figure 10) and female walleye matured at age 7 (Figure 11). Catch rate (walleye/ 100 m 2 /24 h) 2.5 2 1.5 1 0.5 0 Immature males Mature males 0 4 8 12 16 20 Figure 10. at maturity of male walleye from Ethel Lake, Alberta, 2007 (n = 92). Catch rate (walleye/ 100 m 2 /24 h) 2.5 2 1.5 1 0.5 0 Immature females Mature females 0 4 8 12 16 20 Figure 11. at maturity of female walleye from Ethel Lake, Alberta, 2007 (n = 36). 14
4.2.3 Hilda Lake Walleye from Hilda Lake displayed a narrow age class distribution with a mean (± SE) age of 7.1 ± 0.2 y (n = 145). Based on WMRP criteria, the age class distribution was unstable with ages 7, 8 and 9 supporting the fishery. YOY and ages 2, 3 and 5 were less abundant, and there were few fish older than age 9 (Figure 12). Catch rate (walleye/100 m 2 /24 h) 8.0 7.0 6.0 5.0 4.0 3.0 2.0 1.0 0.0 0 4 8 12 16 20 Figure 12. class distribution of walleye from Hilda Lake, Alberta, 2007. Mean (± SE) age was 7.1 ± 0.2 y, n = 145. The Hilda Lake walleye fishery was likely composed of slow or very slow growing fish. The youngest walleye sampled from Hilda Lake to reach 500 mm FL was age 9. The average walleye was predicted to reach 500 mm FL at approximately age 13 (Figure 13). Hilda Lake walleye appeared to be early maturing (< 8 y). Of 135 walleye examined in 2007, 38% (n = 51) were mature males and 47% (n = 64) were mature females; the remaining walleye were immature. Both male and female walleye matured at age 5 (Figures 14 and 15). 15
700 600 500 400 300 200 100 0 age and length von Betalanffy growth curve 0 4 8 12 16 20 Figure 13. Length at age relationship for walleye from Hilda Lake, Alberta, 2007. The von Bertalanffy growth curve is shown by the solid line. K = 0.176, t0 = 1.601, L = 551.5 mm, n = 145. Catch rate (walleye/ 100 m 2 /24 h) 5 4 3 2 1 0 Immature males Mature males 0 4 8 12 16 20 Figure 14. at maturity of male walleye from Hilda Lake, Alberta, 2007 (n = 56). 16
Catch rate (walleye/ 100 m 2 /24 h) 5 4 3 2 1 0 Immature females Mature females 0 4 8 12 16 20 Figure 15. at maturity of female walleye from Hilda Lake, Alberta, 2007 (n = 79). 4.3 Stock assessment summaries Walleye sampled from Gregoire Lake had a broad age class distribution that was moderately unstable. The average walleye reached 500 mm FL at age 14. Male walleye reached maturity at age 4, whereas female walleye reached maturity at age 6. The catch rate of walleye was 11.8 walleye/100 m 2 /24 h. Walleye sampled from Ethel Lake had a broad age class distribution that was moderately unstable. The average walleye reached 500 mm FL at age 13. Male walleye reached maturity at age 4, whereas female walleye reached maturity at age 7. The catch rate of walleye was 14.6 walleye/100 m 2 /24 h. Walleye sample from Hilda Lake had a narrow and unstable age class distribution. The average walleye reached 500 mm FL at age 13. Male and female walleye both reached maturity at age 5. The catch rate of walleye was 15.1 walleye/100 m 2 /24 h. 17
5.0 LITERATURE CITED Berry, D. 1995. Alberta s walleye management and recovery plan. Alberta Fish and Wildlife Division, Edmonton, Alberta, Canada. 32 pp. Duffy, M., J. McNulty, and T. Mosindy. 2000. Identification of sex, maturity and gonad condition of walleye Stizostedion vitreum vitreum. Ontario Ministry of Natural Resources, Thunder Bay, Ontario, Canada. 33 pp. Haddon, M. 2001. Modeling and quantitative methods in fisheries. Chapman and Hall/CRC, Boca Raton, Florida, USA. 406 pp. Mackay, W.C., G.R. Ash, and H.J. Norris. 1990. Fish ageing methods for Alberta. R.L. & R. Environmental Services Ltd., in association with Alberta Fish and Wildlife Division and University of Alberta, Edmonton, Alberta, Canada. 113 pp. Mitchell, P., and E. Prepas. 1990. Atlas of Alberta lakes. University of Alberta Press, Edmonton, Alberta, Canada. 675 pp. Morgan, G.E. 2000. Manual of instructions, Fall Walleye Index Netting (FWIN). Ontario Ministry of Natural Resources, Fish and Wildlife Branch, Peterborough, Ontario, Canada. 37 pp. Slipke, J., and M. Maceina. 2006. Fishery analyses and simulations tools (FAST), version 3.0. Auburn University, Department of Fisheries and Allied Aquacultures, Auburn, Alabama, USA. Sullivan, M.G. 2003. Active management of walleye fisheries in Alberta: dilemmas of managing recovering fisheries. North American Journal of Fisheries Management 23: 1343 1358. Sullivan, M.G. 2004. Computer simulation of sport fishery parameters. Alberta Fish and Wildlife Division, Edmonton, Alberta, Canada. 16 pp. 18
Sullivan, M.G., and D. Park. 2004. Alberta walleye index netting protocols: summary of joint ACA/SRD index netting subcommittee. Alberta Fish and Wildlife Division and Alberta Conservation Association, Edmonton, Alberta, Canada. 13 pp. Swanson, H., and R. Zurawell. 2006. Gregoire Lake water quality monitoring report. Provincial Parks Lake Monitoring Program, Monitoring and Evaluation Branch, Environmental Assurance Division, Alberta Environment, Edmonton, Alberta, Canada. 26 pp. von Bertalanffy, L. 1938. A quantitative theory of organic growth. Human Biology 10: 181 213. 19
6.0 APPENDICES Appendix 1. Net location, set and inspection times for the survey of Gregoire Lake, Alberta, 2007. Set Number Depth stratum UTM Easting UTM Northing Net set date Net Inspection Date Net soak (h) 46 Deep 490350 6257820 11 Sep 2007 12 Sep 2007 23.5 73 Shallow 491390 6260182 11 Sep 2007 12 Sep 2007 24.1 79 Shallow 491969 6257267 11 Sep 2007 12 Sep 2007 26.4 87 Shallow 492417 6255232 11 Sep 2007 12 Sep 2007 25.4 54 Deep 490932 6256219 11 Sep 2007 12 Sep 2007 23.2 98 Shallow 492940 6255236 11 Sep 2007 12 Sep 2007 23.5 59 Deep 491016 6258674 12 Sep 2007 13 Sep 2007 23.4 34 Deep 489987 6257322 12 Sep 2007 13 Sep 2007 23.7 14 Shallow 489106 6257822 12 Sep 2007 13 Sep 2007 23.4 80 Shallow 491933 6257748 12 Sep 2007 13 Sep 2007 22.0 114 Shallow 493958 6255222 12 Sep 2007 13 Sep 2007 21.9 126 Shallow 494955 6256331 12 Sep 2007 13 Sep 2007 22.6 28 Shallow 489482 6259779 13 Sep 2007 14 Sep 2007 22.3 43 Deep 490507 6256288 13 Sep 2007 14 Sep 2007 22.6 63 Shallow 491464 6255389 13 Sep 2007 14 Sep 2007 22.4 93 Shallow 492614 6258292 13 Sep 2007 14 Sep 2007 22.5 107 Shallow 493420 6255238 13 Sep 2007 14 Sep 2007 23.3 116 Shallow 494141 6256318 13 Sep 2007 14 Sep 2007 23.1 20
Appendix 2. Net location, set and inspection times for the survey of Ethel Lake, Alberta, 2007. Set Number Depth stratum UTM Easting UTM Northing Net set date Net Inspection date Net soak (h) 6 Deep 541612 6041701 19 Sep 2007 20 Sep 2007 24.0 8 Deep 541506 6042663 19 Sep 2007 20 Sep 2007 23.1 27 Shallow 542879 6043127 19 Sep 2007 20 Sep 2007 24.8 2 Shallow 540878 6042119 20 Sep 2007 21 Sep 2007 23.2 15 Deep 541951 6043196 20 Sep 2007 21 Sep 2007 23.4 28 Shallow 543145 6043583 20 Sep 2007 21 Sep 2007 23.2 13 Shallow 542010 6042110 21 Sep 2007 22 Sep 2007 23.0 21 Deep 542655 6043056 21 Sep 2007 22 Sep 2007 22.5 22 Deep 542504 6043612 21 Sep 2007 22 Sep 2007 23.0 Appendix 3. Net location, set and inspection times for the survey of Hilda Lake, Alberta, 2007. Set number Depth stratum UTM Easting UTM Northing Net set date Net Inspection date Net soak (h) 8 Deep 536480 6041335 19 Sep 2007 20 Sep 2007 23.3 27 Shallow 537819 6043230 19 Sep 2007 20 Sep 2007 23.8 15 Deep 537073 6042800 19 Sep 2007 20 Sep 2007 24.5 18 Deep 537419 6041826 20 Sep 2007 21 Sep 2007 24.2 14 Shallow 537011 6042410 20 Sep 2007 21 Sep 2007 24.2 20 Deep 537451 6042866 20 Sep 2007 21 Sep 2007 23.9 16 Shallow 537420 6040836 21 Sep 2007 22 Sep 2007 23.6 12 Deep 536956 6041324 21 Sep 2007 22 Sep 2007 23.2 13 Deep 536991 6041909 21 Sep 2007 22 Sep 2007 23.3 21
Appendix 4. Biological data collected from walleye during the survey of Gregoire Lake, Alberta, 2007. Abbreviations: WALL = walleye, M = male, F = female, U = unidentified. WALL 1 476 1,240 M Mature 13 WALL 6 317 320 F Immature 3 WALL 7 509 1,360 M Mature 18 WALL 8 479 1,220 M Mature 13 WALL 10 502 1,580 F Mature 10 WALL 11 482 1,190 M Mature 20 WALL 12 586 2,070 F Mature 17 WALL 13 472 1,110 M Mature 11 WALL 14 502 1,250 F Mature 16 WALL 15 454 940 M Mature 17 WALL 16 499 1,300 M Mature 19 WALL 17 450 1,050 M Mature 8 WALL 18 545 1,930 F Mature 13 WALL 20 557 1,800 F Mature 13 WALL 22 252 170 U Immature 2 WALL 36 350 510 M Mature 3 WALL 39 320 400 F Immature 3 WALL 42 335 440 F Immature 3 WALL 43 390 680 F Immature 4 WALL 44 477 1,250 M Mature 13 WALL 45 433 1,000 M Mature 6 WALL 46 507 1,610 F Mature 10 WALL 47 482 1,300 M Mature 10 WALL 49 538 1,800 F Mature WALL 50 445 1,020 M Mature 10 WALL 56 509 1,530 M Mature 17 WALL 57 500 1,580 F Mature 11 WALL 61 113 13 U Immature 0 WALL 62 190 67 U Immature 1 22
Appendix 4. Continued. WALL 79 322 395 M Immature 3 WALL 80 210 95 F Immature 1 WALL 81 234 127 M Immature 2 WALL 86 328 370 M Immature 3 WALL 87 328 370 U Immature 3 WALL 88 340 450 U Immature 3 WALL 89 375 620 F Immature 4 WALL 90 460 1,190 M Mature 13 WALL 91 465 1,200 M Mature 10 WALL 92 487 1,350 M Mature 12 WALL 93 467 1,220 M Mature 10 WALL 94 492 1,440 M Mature 17 WALL 98 339 420 U Immature 3 WALL 99 330 390 M Immature 3 WALL 100 521 1,730 F Mature 10 WALL 101 365 550 M Immature 3 WALL 102 409 850 M Mature 5 WALL 103 438 1,000 M Mature 7 WALL 104 425 900 M Mature 15 WALL 105 431 1,020 M Mature 10 WALL 106 449 1,437 M Mature 12 WALL 107 450 1,246 M Mature 13 WALL 108 453 1,146 M Mature 9 WALL 109 455 1,029 M Mature 13 WALL 118 550 2,104 F Mature 11 WALL 119 494 1,731 M Mature 11 WALL 123 116 16 U Immature 0 WALL 138 235 133 F Immature 1 WALL 139 201 93 F Immature 1 WALL 140 213 103 F Immature 1 WALL 141 214 106 M Immature 1 23
Appendix 4. Continued. WALL 142 207 101 M Immature 1 WALL 143 220 120 F Immature 1 WALL 144 217 109 F Immature 1 WALL 145 202 97 M Immature 1 WALL 146 205 98 F Immature 1 WALL 147 233 135 M Immature 2 WALL 152 340 469 M Mature 3 WALL 153 312 374 M Mature 3 WALL 154 302 296 F Immature 3 WALL 155 460 1,092 M Mature 10 WALL 156 461 1,229 M Mature 10 WALL 157 483 1,358 M Mature 16 WALL 161 470 1,238 M Mature 10 WALL 162 326 394 F Immature 3 WALL 163 396 728 M Mature 6 WALL 164 469 1,355 F Mature 10 WALL 165 316 343 M Immature 3 WALL 166 470 1,395 F Mature 7 WALL 167 445 1,045 M Mature 6 WALL 168 451 1,047 M Mature 10 WALL 169 381 608 M Mature 6 WALL 172 460 1,073 M Mature 12 WALL 173 433 915 M Mature 9 WALL 174 473 1,212 M Mature 12 WALL 175 448 1,125 M Mature 10 WALL 176 446 1,130 M Mature 11 WALL 177 538 1,991 F Mature 9 WALL 178 485 1,279 M Mature 15 WALL 179 525 1,945 F Mature 10 WALL 180 543 1,933 F Mature 12 WALL 181 496 1,576 M Mature 10 24
Appendix 4. Continued. WALL 182 580 2,362 F Mature 13 WALL 183 489 1,444 F Mature 6 WALL 185 526 1,773 F Mature 11 WALL 186 549 2,017 F Mature 10 WALL 187 520 1,790 F Mature 12 WALL 188 492 1,539 F Mature 10 WALL 189 530 1,717 F Mature 11 WALL 193 568 2,451 F Mature 13 WALL 198 264 183 U Immature 2 WALL 199 485 1,280 M Mature 19 WALL 200 475 1,240 M Mature 17 WALL 201 444 1,090 M Mature 9 WALL 203 100 11 U Immature 0 WALL 206 195 71 F Immature 1 WALL 228 437 927 M Mature 6 WALL 229 268 200 F Immature 2 WALL 230 362 556 M Mature 4 WALL 231 191 88 F Immature 1 WALL 232 225 123 M Immature 1 WALL 247 445 1,186 M Mature 14 WALL 248 345 452 F Immature 3 WALL 249 325 371 F Immature 3 WALL 250 323 399 F Immature 3 WALL 251 311 346 M Immature 3 WALL 252 379 598 M Mature 4 WALL 265 477 1,290 M Mature 13 WALL 266 468 1,199 F Mature 10 WALL 267 466 1,239 M Mature 10 WALL 268 468 1,404 M Mature 13 WALL 271 536 1,813 F Mature 10 WALL 272 465 1,251 M Mature 10 25
Appendix 4. Continued. WALL 273 489 1,249 M Mature 17 WALL 274 471 1,224 M Mature 13 WALL 275 487 1,291 M Mature 15 WALL 276 482 1,290 M Mature 13 WALL 277 525 1,639 F Mature 9 WALL 280 534 2,027 F Mature 10 WALL 281 525 1,594 F Mature 15 WALL 282 532 1,769 F Mature 10 WALL 283 554 2,027 F Mature 13 WALL 284 483 1,488 M Mature 10 WALL 290 215 101 M Immature 2 WALL 291 235 110 F Immature 2 WALL 292 518 1,459 M Mature 19 WALL 294 491 1,391 M Mature 13 WALL 295 451 918 M Mature 5 WALL 296 532 1,770 F Mature 10 WALL 297 535 1,686 F Mature 13 WALL 298 606 2,395 F Mature 13 WALL 299 473 1,051 M Mature 16 WALL 300 491 1,231 M Mature 17 WALL 301 500 1,463 F Mature 9 WALL 302 468 1,193 M Mature 15 WALL 303 538 1,654 F Mature 9 WALL 304 569 2,194 F Mature 13 WALL 307 279 228 F Immature 2 WALL 308 492 1,412 F Mature 11 WALL 310 525 1,508 F Mature 10 WALL 311 523 1,681 M Mature 17 WALL 312 510 1,643 F Mature 10 WALL 313 549 1,829 F Mature 13 WALL 314 538 1,704 F Mature 11 26
Appendix 4. Continued. WALL 315 492 1,430 M Mature 17 WALL 316 513 1,500 F Mature 17 WALL 317 531 1,630 F Mature 16 WALL 318 538 1,810 F Mature 13 WALL 319 540 1,960 F Mature 17 WALL 320 526 1,480 M Mature 20 WALL 321 556 1,830 F Mature 10 WALL 322 545 2,070 F Mature 13 WALL 323 468 1,300 M Mature 16 WALL 325 555 2,124 F Mature 13 WALL 326 583 2,165 F Mature 13 WALL 327 557 2,080 F Mature 13 WALL 328 571 2,174 F Mature 13 WALL 342 206 93 U Immature 1 WALL 346 336 440 F Immature 3 WALL 355 440 1,020 M Mature 10 WALL 356 433 1,010 M Mature 6 WALL 357 401 750 M Mature 4 WALL 358 447 1,100 M Mature 10 WALL 369 195 80 M Immature 1 WALL 370 264 183 M Immature 2 WALL 371 189 72 M Immature 1 WALL 376 323 340 M Immature 3 WALL 384 424 879 M Mature 5 WALL 385 457 1,027 F Immature 5 WALL 392 430 873 F Immature 5 WALL 397 357 501 M Mature 4 WALL 398 535 1,701 F Mature 15 WALL 407 433 954 M Mature 5 WALL 408 512 1,428 F Mature 10 WALL 409 502 1,382 F Mature 12 27
Appendix 4. Continued. WALL 411 554 2,086 F Mature 13 WALL 418 360 510 M Immature 3 WALL 419 510 1,510 F Mature 9 WALL 420 496 1,310 F Mature 9 WALL 421 419 860 F Immature 5 WALL 422 520 1,560 F Mature 11 WALL 423 553 1,980 F Mature 10 WALL 427 563 2,080 F Mature 10 WALL 431 520 1,620 F Mature 16 WALL 432 487 1,330 M Mature 13 WALL 433 451 1,120 F Immature 5 WALL 434 455 1,140 M Mature 17 WALL 437 576 1,890 F Mature 19 WALL 439 557 2,040 F Mature 16 WALL 440 113 12 U Immature 0 WALL 441 462 1,200 M Mature 10 WALL 443 452 1,070 M Mature 9 WALL 444 537 1,830 F Mature 10 WALL 456 255 175 F Immature 3 WALL 457 223 109 F Immature 1 WALL 458 250 165 F Immature 2 WALL 470 315 368 M Immature 3 WALL 476 353 577 F Immature 3 WALL 477 398 702 F Immature 5 WALL 478 415 903 M Mature 5 WALL 479 480 1,303 M Mature 10 WALL 488 438 1,050 M Mature 13 WALL 489 468 1,160 M Mature 13 WALL 490 475 1,270 F Immature 6 WALL 491 480 1,310 M Mature 13 WALL 492 462 1,270 M Mature 13 28
Appendix 4. Continued. WALL 493 446 1,010 M Mature 9 WALL 494 442 1,130 M Mature 10 WALL 495 544 2,020 F Mature 11 WALL 499 571 2,210 F Mature 13 WALL 500 528 1,858 F Mature 10 WALL 501 533 2,112 F Mature 13 WALL 502 545 2,081 F Mature 10 WALL 503 505 1,749 F Mature 10 WALL 504 463 1,377 M Mature 17 WALL 506 210 110 M Immature 1 WALL 509 504 1,540 F Mature 10 WALL 510 327 370 M Immature 3 WALL 511 379 640 M Mature 4 WALL 515 575 2,170 F Mature 13 WALL 519 519 1,489 F Mature 10 WALL 520 585 1,925 F Mature 16 WALL 522 565 2,165 F Mature 16 WALL 541 501 1,487 M Mature 10 WALL 564 533 1,703 F Mature 13 29
Appendix 5. Biological data collected from non target fish species during the survey of Gregoire Lake, Alberta, 2007. Abbreviations: CISC = cisco, LKWH = lake whitefish, NRPK = northern pike, SPSH = spottail shiner, TRPR = trout perch, M = male, F = female, U = unidentified. CISC 4 U Unknown CISC 5 190 93 U Immature CISC 84 200 100 U Immature CISC 85 204 104 M Mature CISC 136 143 43 U Unknown CISC 137 154 52 U Unknown CISC 151 195 107 U Unknown CISC 217 143 35 U Unknown CISC 218 155 48 U Unknown CISC 219 191 111 U Unknown CISC 220 145 45 U Unknown CISC 221 143 37 U Unknown CISC 222 145 42 U Unknown CISC 223 153 46 U Unknown CISC 224 146 46 U Unknown CISC 225 157 50 U Unknown CISC 226 153 46 U Unknown CISC 227 148 41 U Unknown CISC 234 195 104 U Unknown CISC 235 199 102 U Unknown CISC 236 205 122 U Unknown CISC 237 209 128 U Unknown CISC 238 230 159 U Unknown CISC 239 210 152 U Unknown CISC 240 220 178 U Unknown CISC 241 204 126 U Unknown CISC 242 215 146 U Unknown CISC 243 184 89 U Unknown 30
Appendix 5. Continued. CISC 244 189 99 U Unknown CISC 245 144 44 U Unknown CISC 246 188 89 U Unknown CISC 258 200 121 U Unknown CISC 259 246 187 U Unknown CISC 260 246 189 U Unknown CISC 261 196 122 U Unknown CISC 262 251 262 U Unknown CISC 263 229 172 U Unknown CISC 264 225 157 U Unknown CISC 330 90 10 U Unknown CISC 373 188 88 F Mature CISC 374 210 129 M Mature CISC 375 224 156 F Mature CISC 380 187 90 F Mature CISC 391 190 92 F Mature CISC 454 92 9 U Unknown CISC 455 100 11 U Unknown CISC 464 154 44 F Immature CISC 465 148 38 F Immature CISC 466 183 84 M Mature CISC 485 269 255 F Mature CISC 505 91 9 U Immature CISC 508 280 290 F Mature CISC 513 210 140 F Mature CISC 514 270 280 F Mature CISC 526 88 9 U Immature CISC 527 92 10 U Immature CISC 537 148 40 F Immature CISC 538 144 38 U Immature 31
Appendix 5. Continued. CISC 539 137 31 U Unknown CISC 540 146 41 F Immature CISC 546 191 97 M Mature CISC 547 192 91 F Mature LKWH 59 438 1,300 M Mature LKWH 111 502 2,046 M Mature LKWH 112 520 2,197 M Mature LKWH 113 490 1,740 F Mature LKWH 114 498 1,829 F Mature LKWH 120 524 2,070 M Mature LKWH 121 526 2,220 M Mature LKWH 122 534 2,300 M Mature LKWH 190 530 1,381 M Mature LKWH 191 483 1,607 M Mature LKWH 270 431 1,512 F Mature LKWH 285 455 1,386 F Mature LKWH 287 391 1,049 M Mature LKWH 288 502 2,034 M Mature LKWH 359 504 1,880 M Mature LKWH 360 403 940 F Immature LKWH 361 486 1,550 F Mature LKWH 366 438 1,433 F Mature LKWH 410 475 1,680 M Mature LKWH 412 430 1,308 M Mature LKWH 413 453 1,787 F Mature LKWH 414 460 1,594 M Mature LKWH 415 456 1,687 F Mature LKWH 416 506 1,231 M Mature LKWH 417 523 2,403 M Mature LKWH 424 406 1,040 M Mature 32
Appendix 5. Continued. LKWH 425 456 1,400 M Mature LKWH 428 514 2,040 M Mature LKWH 474 503 2,123 M Mature LKWH 497 506 1,790 M Mature LKWH 498 328 550 M Immature LKWH 521 509 2,172 F Mature LKWH 523 483 1,930 F Mature LKWH 545 225 145 M Immature LKWH 553 311 416 U Unknown LKWH 554 320 470 M Immature LKWH 555 232 157 F Immature LKWH 556 282 306 F Immature LKWH 563 330 510 M Immature LKWH 565 329 524 F Immature LKWH 566 320 499 F Immature LKWH 567 434 1,280 M Mature LKWH 568 428 1,094 M Mature LKWH 569 441 1,459 M Mature LKWH 570 467 1,535 M Mature LKWH 571 398 945 M Mature LKWH 572 450 1,420 M Mature LKWH 573 389 868 F Mature LKWH 574 446 1,734 F Mature LKWH 575 495 2,939 F Mature LKWH 576 444 1,582 F Mature LKWH 578 460 1,795 F Mature LKWH 579 497 1,886 M Mature NRPK 9 469 640 F Mature 3 NRPK 23 563 1,150 F Mature 4 NRPK 40 588 1,370 F Mature 4 33
Appendix 5. Continued. NRPK 48 557 960 F Mature 4 NRPK 58 775 3,320 F Mature 8 NRPK 95 756 3,020 F Mature 6 NRPK 96 702 2,440 F Mature 6 NRPK 110 665 1,928 M Mature 7 NRPK 124 509 788 M Mature 4 NRPK 125 570 1,072 F Mature 5 NRPK 126 555 1,105 F Mature 6 NRPK 148 513 990 M Mature 4 NRPK 158 415 595 M Mature 2 NRPK 159 535 960 F Mature 5 NRPK 160 378 382 F Immature 1 NRPK 170 492 749 M Mature 3 NRPK 171 494 816 M Mature 4 NRPK 184 640 1694 F Mature 6 NRPK 194 358 301 F Immature 1 NRPK 195 454 630 M Mature 3 NRPK 196 537 1,000 M Mature 4 NRPK 202 568 970 F Mature 5 NRPK 207 216 77 F Immature 0 NRPK 233 345 276 F Immature 1 NRPK 253 462 682 M Mature 3 NRPK 254 599 1,067 F Mature 6 NRPK 255 497 827 M Mature 4 NRPK 256 432 533 F Mature 2 NRPK 257 616 1,396 F Mature 6 NRPK 269 507 1,006 M Mature 4 NRPK 278 552 1,207 F Mature 4 NRPK 279 658 1,777 F Mature 6 NRPK 306 474 687 M Mature 3 34
Appendix 5. Continued. NRPK 309 630 1,395 F Mature 5 NRPK 324 535 1,010 M Mature 4 NRPK 329 583 1,264 F Mature 5 NRPK 331 543 721 F Mature 5 NRPK 332 430 644 M Mature 3 NRPK 343 590 1,210 F Mature 3 NRPK 344 665 1,770 F Mature 6 NRPK 347 572 968 F Mature 5 NRPK 348 425 572 M Mature 3 NRPK 349 390 418 M Mature 2 NRPK 350 553 1,021 F Mature 3 NRPK 351 525 882 M Mature 4 NRPK 352 477 707 M Mature 3 NRPK 353 439 591 M Mature 2 NRPK 354 478 807 M Mature 3 NRPK 377 661 1,971 F Mature 5 NRPK 378 635 1,617 F Mature 5 NRPK 381 559 1,144 F Mature 5 NRPK 382 495 859 M Mature 3 NRPK 383 555 1,081 F Mature 4 NRPK 386 568 1,195 F Mature 4 NRPK 387 501 848 F Mature 3 NRPK 388 492 725 F Mature 4 NRPK 389 336 255 F Immature 1 NRPK 390 360 332 F Immature 1 NRPK 393 545 1,134 M Mature 4 NRPK 394 547 1,153 F Mature 4 NRPK 395 531 889 F Mature 3 NRPK 396 443 525 M Immature 3 NRPK 399 545 1,063 F Mature 5 35
Appendix 5. Continued. NRPK 400 487 782 F Mature 3 NRPK 401 538 545 F Mature 5 NRPK 402 552 532 F Mature 3 NRPK 403 532 1,000 M Mature 5 NRPK 404 555 1,113 F Mature 5 NRPK 405 473 685 M Mature 4 NRPK 406 567 1093 F Mature 5 NRPK 430 410 490 M Mature 2 NRPK 435 522 780 M Mature 5 NRPK 436 547 1,070 F Mature 3 NRPK 438 765 2,860 F Mature 9 NRPK 442 419 500 M Mature 2 NRPK 445 671 2,100 F Mature 5 NRPK 459 580 1,288 F Mature 4 NRPK 460 587 1,455 F Mature 5 NRPK 461 646 1,154 F Mature 5 NRPK 467 777 3,388 F Mature 8 NRPK 468 333 287 M Mature 1 NRPK 469 478 825 F Mature 2 NRPK 471 418 483 M Mature 2 NRPK 472 397 450 M Mature 2 NRPK 473 514 1,020 M Mature 4 NRPK 480 589 1,326 F Mature 4 NRPK 481 590 1,303 F Mature 5 NRPK 482 515 915 M Mature 4 NRPK 483 518 973 M Mature 4 NRPK 484 867 5,000 F Mature 9 NRPK 496 740 1,650 F Mature 6 NRPK 507 552 990 M Mature 5 NRPK 512 512 890 M Mature 5 36
Appendix 5. Continued. NRPK 516 531 1,000 F Mature 4 NRPK 517 492 800 F Mature 3 NRPK 518 509 880 M Mature 3 NRPK 524 525 853 F Mature 4 NRPK 529 594 1,016 F Mature 4 NRPK 530 521 1,010 F Mature 4 NRPK 542 530 904 F Mature 5 NRPK 543 508 866 M Mature 5 NRPK 544 327 236 M Mature 1 NRPK 549 435 576 M Mature 3 NRPK 550 504 937 F Mature 4 NRPK 551 517 609 M Mature 5 NRPK 552 463 678 F Mature 3 NRPK 557 564 840 F Mature 5 NRPK 558 465 700 F Mature 3 NRPK 559 422 530 F Mature 2 NRPK 560 498 880 M Mature 3 NRPK 561 558 1,260 M Mature 3 NRPK 562 524 880 F Mature 5 NRPK 577 887 4,788 F Mature 10 SPSH 528 90 9 U Unknown TRPR 305 96 9 F Mature 37
Appendix 6. Standardized probability density function of walleye catch rate from Gregoire Lake, Alberta, 2007. Mean = 11.8 walleye/100 m 2 / 24 h, 95% CI = 8.7 16.6, n = 18. Standardized probability density. 1.0 0.8 0.6 0.4 0.2 0.0 0 5 10 15 20 25 Catch rate (walleye/100 m 2 /24 h) 38
Appendix 7. Biological data collected from walleye during the survey of Ethel Lake, Alberta, 2007. Abbreviations: WALL = walleye, M = male, F = female, U = unidentified. WALL 16 295 229 M Immature 3 WALL 20 239 126 M Immature 2 WALL 21 252 163 M Immature 2 WALL 22 330 339 M Immature 4 WALL 23 234 114 M Immature 2 WALL 26 332 348 F Immature WALL 27 414 702 M Mature 8 WALL 28 462 1,115 M Mature 10 WALL 29 443 988 M Mature 9 WALL 30 504 1,354 F Mature 11 WALL 40 405 670 F Immature 5 WALL 41 460 1,037 M Mature 9 WALL 42 437 865 F Mature 7 WALL 43 404 712 M Mature 6 WALL 44 343 421 M Mature 4 WALL 45 351 463 M Mature 4 WALL 46 391 600 F Immature 4 WALL 51 455 1,004 M Mature 9 WALL 52 511 1,439 M Mature 17 WALL 53 538 1,495 F Mature 11 WALL 54 481 1,154 M Mature 9 WALL 58 501 1,528 M Mature 11 WALL 59 465 1,114 M Mature 10 WALL 66 336 366 F Immature 4 WALL 67 261 157 M Immature 3 WALL 68 246 155 M Immature 3 WALL 69 573 1,913 F Mature 11 WALL 73 526 1,412 M Mature 17 WALL 74 449 1,027 M Mature 9 39
Appendix 7. Continued. WALL 75 457 1,033 M Mature 10 WALL 76 454 1,006 M Mature 11 WALL 77 400 639 M Mature 6 WALL 82 468 1,045 M Mature 16 WALL 83 362 483 M Mature 4 WALL 84 399 702 M Mature 7 WALL 85 381 551 M Mature 6 WALL 86 419 833 M Mature WALL 87 377 576 M Mature 6 WALL 88 457 1,084 M Mature 9 WALL 89 475 1,200 M Mature 11 WALL 90 460 1,072 M Mature 9 WALL 93 478 1,209 M Mature 9 WALL 94 442 988 F Mature 5 WALL 95 516 1,471 F Mature 9 WALL 96 514 1,390 M Mature 17 WALL 98 450 994 M Mature 17 WALL 99 466 1,091 M Mature 11 WALL 100 531 1,659 F Mature 9 WALL 101 526 1,690 M Mature 17 WALL 102 584 1,965 F Mature 11 WALL 104 377 551 M Mature 5 WALL 122 443 963 M Mature 10 WALL 136 553 1,914 M Mature 16 WALL 137 520 1,534 F Mature 11 WALL 138 519 1,348 M Mature 17 WALL 139 466 941 M Mature 17 WALL 151 126 U Unknown 0 WALL 164 495 1,230 M Mature 17 WALL 165 554 1,690 F Mature 17 40
Appendix 7. Continued. WALL 181 335 401 F Immature 4 WALL 193 470 1,090 F Mature 9 WALL 194 489 1,140 M Mature 17 WALL 195 499 1,260 M Mature 17 WALL 207 213 100 M Immature 2 WALL 208 330 350 M Immature 4 WALL 209 218 100 M Immature 2 WALL 213 386 600 M Mature 7 WALL 214 382 575 M Mature 5 WALL 215 371 500 M Mature 6 WALL 216 338 390 M Immature 4 WALL 217 310 300 M Immature 4 WALL 221 476 1,238 M Mature 9 WALL 222 369 474 F Immature 6 WALL 223 374 569 F Immature 4 WALL 224 330 368 M Immature 4 WALL 232 512 1,563 F Mature 9 WALL 233 513 1,346 M Mature 17 WALL 234 500 1,194 M Mature WALL 235 511 1,328 M Mature 17 WALL 236 534 1,851 M Mature 10 WALL 257 536 1,590 F Mature 9 WALL 269 530 1,400 M Mature 17 WALL 270 482 1,060 M Mature 17 WALL 278 505 1,600 M Mature 16 WALL 295 400 650 F Immature 5 WALL 296 455 850 F Immature 9 WALL 306 404 620 M Mature 5 WALL 307 351 418 F Immature 4 WALL 308 391 640 M Mature 5 41
Appendix 7. Continued. WALL 314 535 1,450 M Mature 17 WALL 315 435 950 F Mature 6 WALL 316 513 1,325 M Mature 17 WALL 319 590 2,300 F Mature 10 WALL 323 378 513 M Mature 5 WALL 334 455 1,050 M Mature 9 WALL 335 248 150 M Immature 2 WALL 336 300 250 M Immature 3 WALL 343 260 160 M Immature 3 WALL 344 218 125 M Immature 2 WALL 345 353 500 F Immature 4 WALL 346 334 375 M Mature 4 WALL 348 367 599 M Mature 4 WALL 349 380 650 F Immature 4 WALL 350 265 200 M Immature 3 WALL 355 367 525 M Mature 5 WALL 356 389 575 M Mature 5 WALL 357 530 1,550 M Mature 17 WALL 358 500 1,250 M Mature 17 WALL 361 477 1,200 M Mature 9 WALL 362 477 1,250 F Mature 7 WALL 363 490 1,500 F Mature 7 WALL 364 480 1,200 M Mature 17 WALL 365 515 1,600 F Mature 9 WALL 366 542 1,700 F Mature 9 WALL 367 545 1,800 M Mature 17 WALL 374 238 150 M Immature 3 WALL 381 234 125 F Immature 2 WALL 382 495 1,175 M Mature 16 WALL 385 345 450 M Mature 4 42
Appendix 7. Continued. WALL 386 376 550 M Mature 5 WALL 387 312 300 M Immature 4 WALL 388 433 975 M Mature 10 WALL 389 393 650 F Immature 6 WALL 395 335 440 F Immature 4 WALL 396 422 677 M Mature 11 WALL 397 365 470 F Immature 5 WALL 404 444 1,050 M Mature 9 WALL 405 437 950 M Mature 6 WALL 406 506 1,475 F Mature 9 WALL 407 472 1,175 M Mature WALL 408 512 1,425 F Mature 10 WALL 409 488 1,225 M Mature 9 WALL 412 539 1,675 M Mature 11 43
Appendix 8. Biological data collected from non target fish species during the survey of Ethel Lake, Alberta, 2007. Abbreviations: CISC = cisco, NRPK = northern pike, LKWH = lake whitefish, WHSC = white sucker, YLPR = yellow perch, M = male, F = female, U = unidentified. CISC 18 371 680 M Mature CISC 19 360 773 M Mature CISC 97 398 925 U Unknown CISC 135 357 740 F Mature CISC 156 367 800 F Mature CISC 178 383 800 M Mature CISC 202 100 10 U Unknown CISC 203 104 10 U Unknown CISC 204 107 14 U Unknown CISC 205 104 11 U Unknown CISC 241 357 764 M Mature CISC 249 420 1,209 F Mature CISC 256 452 1,374 F Mature CISC 280 418 1,260 F Mature CISC 333 399 955 M Mature CISC 372 100 10 U Immature CISC 373 102 10 M Immature CISC 384 233 150 M Immature CISC 394 221 150 M Immature LKWH 144 530 2,519 M Mature LKWH 145 561 2,619 M Mature LKWH 146 458 1,288 M Mature LKWH 148 528 2,283 F Mature LKWH 279 501 1,940 F Mature LKWH 317 573 2,400 M Mature LKWH 320 504 1,900 M Mature LKWH 321 548 2,150 F Mature LKWH 393 285 350 M Immature LKWH 413 505 2,040 F Mature 44
Appendix 8. Continued. LKWH 414 520 2,275 F Mature LKWH 415 495 1,925 F Mature NRPK 1 618 1,556 F Mature 6 NRPK 2 548 1,056 F Mature 4 NRPK 24 424 568 F Mature 2 NRPK 31 427 545 F Mature 3 NRPK 32 490 626 M Mature 4 NRPK 33 390 404 M Mature 2 NRPK 34 402 432 M Mature 2 NRPK 35 459 475 M Mature 3 NRPK 36 479 785 F Mature 2 NRPK 37 443 586 M Mature 3 NRPK 38 425 542 F Mature 3 NRPK 39 480 739 F Mature 4 NRPK 47 573 1,220 F Mature 5 NRPK 48 452 395 M Mature 3 NRPK 49 471 703 M Mature 3 NRPK 50 514 911 F Mature 4 NRPK 55 725 2,850 M Mature 8 NRPK 70 458 728 F Mature 3 NRPK 71 645 1,558 F Mature 6 NRPK 78 470 782 M Mature 3 NRPK 79 456 592 F Mature 3 NRPK 80 536 1,151 F Mature 4 NRPK 91 516 847 M Mature 4 NRPK 92 538 1,206 F Mature 3 NRPK 103 429 612 M Mature 3 NRPK 105 573 1,296 F Mature 6 NRPK 106 535 1,221 M Mature 6 NRPK 107 520 713 M Mature 5 NRPK 108 376 591 M Mature 3 45