Tanner crab Chinoecetes bairdi Popula.on in the Kodiak District of the Westward Region. Kally Spalinger
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1 Tanner crab Chinoecetes bairdi Popula.on in the Kodiak District of the Westward Region Kally Spalinger
2 2
3 Methods R/V Resolu.on, 92 feet 4-Eastern oler trawl is towed for 1. nmi A subsample is taken to determine species composi.on Commerciallyimportant species are measured 3
4 4
5 5
6 Purpose Focused on collec.ng data from commercially important species Provide abundance, density, and length/sex data to state and federal managers: Tanner crab Pollock, Pacific cod Rock sole, skates 6
7 216 Summary - Kodiak 29 successful hauls 142 species iden.fied 26,359 fish measured 27,834 shellfish measured 24,645 Tanner crab measured Catch (kg) 7, 6, 5, 4, 3, 2, 1, Top 5 species caught by weight, arrowtooth flounder flathead sole walleye pollock Species Tanner crab sunflower sea star 7
8 Number of crab (millions) Tanner crab abundance - Kodiak Males Females Year 8
9 Kodiak District Overview Male size frequencies and shell condi.ons Legal male distribu.on Harvest strategy Fishery performance and exploita.on rate 9
10 Carapace Width 1
11 Kodiak District male Tanner crab size frequency Number of male Tanner crabs 3,5, 3,, 2,5, 2,, 1,5, 1,, 5, Survey Year Carapace Width (mm)
12 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 3,5, 3,, 2,5, 2,, 1,5, 1,, 5, Survey Year Carapace Width (mm)
13 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 3,5, 3,, 2,5, 2,, 1,5, 1,, 5, Survey Year Carapace Width (mm)
14 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 3,5, 3,, 2,5, 2,, 1,5, 1,, 5, Survey Year Fishery Opened Carapace Width (mm)
15 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 1,, 9,, 8,, 7,, 6,, 5,, 4,, 3,, 2,, 1,, Carapace Width (mm) Survey Year Fishery Opened 15
16 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 1,, 9,, 8,, 7,, 6,, 5,, 4,, 3,, 2,, 1,, Carapace Width (mm) Survey Year Fishery Opened 16
17 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 1,, 9,, 8,, 7,, 6,, 5,, 4,, 3,, 2,, 1,, Carapace Width (mm) Survey Year Fishery Opened 17
18 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 25,, 2,, 15,, 1,, 5,, Survey Year Fishery Opened Carapace Width (mm)
19 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 25,, 2,, 15,, 1,, 5,, Survey Year Fishery Opened Carapace Width (mm)
20 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 25,, 2,, 15,, 1,, 5,, Survey Year Fishery Opened Carapace Width (mm)
21 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 25,, 2,, 15,, 1,, 5,, Survey Year Fishery Opened Fishery Closed Carapace Width (mm)
22 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 25,, 2,, 15,, 1,, 5,, Survey Year Fishery Opened Fishery Closed Carapace Width (mm)
23 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 25,, 2,, 15,, 1,, 5,, Survey Year Fishery Opened Fishery Closed Carapace Width (mm)
24 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 25,, 2,, 15,, 1,, 5,, Survey Year Fishery Opened Fishery Closed Carapace Width (mm)
25 Kodiak District male Tanner crab size frequency Fishery Closed 2 Number of male Tanner crabs 25,, 2,, 15,, 1,, 5,, Survey Year Fishery Opened Fishery Closed Carapace Width (mm)
26 Molting crab Old shell New shell (still soft) Empty molted crab shells washed up on beach 26
27 New shell Old shell Very old shell 27
28 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency - 26 Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 28
29 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency - 27 Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 29
30 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency - 28 Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 3
31 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency - 29 Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 31
32 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency - 21 Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 32
33 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 33
34 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 34
35 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 35
36 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 36
37 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 37
38 Male Tanner crab shell condi.on ,, Male Tanner crab size frequency Number of crab 6,, 5,, 4,, 3,, mature legal Soft/New pliable New Old Very old/very very old 2,, 1,, Carapace width (mm) 38
39 39
40 Number of crabs (millions) Total male abundance Fishery closed Year 4
41 Number of crabs (millions) Total male abundance Fishery closed Year 41
42 Number of crabs (millions) Total male abundance Fishery closed Year 42
43 Number of crabs (millions) Total male abundance Fishery closed Year 43
44 Number of crabs (millions) Total male abundance Fishery closed Year 44
45 Number of crabs (millions) Total male abundance Fishery closed Year 45
46 Number of crabs (millions) Total male abundance Fishery closed Year 46
47 Number of crabs (millions) Total male abundance Fishery closed Year 47
48 Number of crabs (millions) Total male abundance Fishery closed Year 48
49 Number of crabs (millions) Total male abundance Fishery closed Year 49
50 Number of crabs (millions) Total male abundance Fishery closed Year 5
51 Harvest Strategy Stair-step harvest regime 51
52 Harvest Strategy Stair-step harvest regime Area Swept Abundance Index number of crab caught x station area = station abundance (net width x tow length) 52
53 Harvest Strategy Stair-step harvest regime 53
54 Harvest Strategy Stair-step harvest regime Area Swept Abundance Index number of crab caught x station area = station abundance (net width x tow length) 1. Must be above mature male threshold (115 mm) 54
55 Harvest Strategy Stair-step harvest regime Area Swept Abundance Index number of crab caught (net width x tow length) x station area = station abundance 1. Must be above mature male threshold (115 mm) 2. Two harvest regime tiers a) Lower rate if below long term average b) Higher rate if above long term average 55
56 Harvest Strategy Stair-step harvest regime Area Swept Abundance Index number of crab caught (net width x tow length) x station area = station abundance 1. Must be above mature male threshold (115 mm) 2. Two harvest regime tiers a) Lower rate if below long term average b) Higher rate if above long term average 3. - a) Harvest rate from 2 applied to molting mature males 56
57 Harvest Strategy Stair-step harvest regime Area Swept Abundance Index number of crab caught (net width x tow length) x station area = station abundance 1. Must be above mature male threshold (115 mm) 2. Two harvest regime tiers a) Lower rate if below long term average b) Higher rate if above long term average 3. - a) Harvest rate from 2 applied to molting mature b) 3% cap on legal males calculated 57
58 Harvest Strategy Stair-step harvest regime Area Swept Abundance Index number of crab caught (net width x tow length) x station area = station abundance 1. Must be above mature male threshold (115 mm) 2. Two harvest regime tiers a) Lower rate if below long term average b) Higher rate if above long term average 3. GHL determined by the smaller of: a) Harvest rate from 2 applied to molting mature b) 3% cap on legal males calculated 58
59 Precautionary Measures Halving of calculated GHL after a closure Protects stock from survey error Minimum GHL requirements Promotes more manageable fisheries 59
60 Kodiak District Fishery Harvest 2,5, 6 2,, GHL Pounds Harvested 5 Pounds of crab 1,5, 1,, 5, Fishery Closed CPUE Fishery Closed Number of crab per pot Fishery Season 6
61 1 Legal male Tanner crab abundance - Kodiak Number of crab (millions) Legal Males Harvested Males Year 61
62 1 Legal male Tanner crab abundance - Kodiak Number of crab (millions) Legal Males Harvested Males 37% of legal males removed each year Year 62
63 1 Legal male Tanner crab abundance - Kodiak 8 Legal Males Number of crab (millions) Harvested Males 37% of legal males removed each year fishery reopened with new harvest strategy 9% of legal males removed each year Year 63
64 12 Male Tanner crab abundance - Kodiak 1 Number of crab (millions) Total Males Mature Males Legal Males Harvested Males Year 64
65 12 Male Tanner crab abundance - Kodiak 1 Number of crab (millions) Total Males Mature Males Legal Males Harvested Males Year 65
66 12 Male Tanner crab abundance - Kodiak 1 Number of crab (millions) Total Males Mature Males Legal Males Harvested Males Year 66
67 12 Male Tanner crab abundance - Kodiak 1 Total Males Number of crab (millions) Mature Males Legal Males Harvested Males -93% -9% Year 67
68 12 Male Tanner crab abundance - Kodiak 1 Total Males Number of crab (millions) Mature Males Legal Males Harvested Males -93% -9%?? Year 68
69 Summary Managers rely on survey abundance es.mates when discussing poten.al fishery openings Confident that the survey is capturing trends and variability in local Tanner crab popula.ons Harvest strategy provides reasonable recommenda.ons and a star.ng point for sebng harvest levels However, large numbers of crab seen as juveniles are not retained in the popula.on to legal size 69
70 216 Resolu.on crew Thank You! Denis Cox, Kurt Pedersen, Gary Wilson Collin Hakkinen, Sherry Barker, Joy Brooks Mark S.chert, Nathaniel Nichols, Kayla Bevaart, Kim Phillips 7
71 Thank You! Questions? 71
72 165 W 16 W 155 W 15 W Cape Douglas Ivanof Bay P S E A Cold Bay 56 N A L A S K I S KO A Castle Cape Akutan Bay D I AK I. 56 N B E R I N G E N N A 58 N 58 N Mount Douglas U L Afognak Island False Pass AKUTAN I. G U L F 54 N 54 N ALASKA Pavlof Bay O F A L A S K A UNALASKA I. Unalaska Bay 165 W 16 W 155 W 15 W 72
73 12,, 1,, Tanner crab abundance index - Kodiak Total Females Kodiak Number of crab 8,, 6,, 4,, Mature Females Female Tanner 2,, crab Year EsMmated number of female Tanner crabs 4,, 3,5, 3,, 2,5, 2,, 1,5, 1,, 5, 216 Kodiak Female Tanner crabs Juvenile Newshell Adult Oldshell Adult Carapace Width (mm) 73
74 Long term What s Next? Large scale oceanographic processes Ocean acidifica.on, temperature change Ecological processes Predator/prey rela.onships Short term Current focus: improving abundance es.mates related to sebng harvest quotas Uncertainty with area-swept abundance 74
75 Area-Swept Assump.ons 1. Net performance is constant 2. All crabs in the trawl path are captured 3. Crabs are evenly distributed throughout survey stations Improve estimates of area considered through bottom mapping Use bottom cameras to map crab locations on habitats 75
76 Area-Swept Assump.ons 1. Net performance is constant 2. All crabs in the trawl path are captured 3. Crabs are evenly distributed throughout survey stations Improve estimates of area considered through bottom mapping CHK CHL CHK CHL Chiniak Bay CHF CHG CHF CHG 76
77 Special projects Improve methods to provide beler informa.on to managers BiLer crab Mul.ple tows Net monitoring Research plakorm for other projects/agencies Collect data and specimens when requested Chela heights Female crab Juvenile fish Stomachs 77
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