Use of SLICE to Reduce Infestations of Salmincola californiensis in Rainbow Trout Oncorhynchus mykiss
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1 Use of SLICE to Reduce Infestations of Salmincola californiensis in Rainbow Trout Oncorhynchus mykiss Presented at: 62 nd Annual Northwest Fish Culture Conference December 6-8, Victoria, BC Niccole Wandelear, Jim Bowker and Dan Carty USFWS AADAP Program Bozeman, MT
2 Introduction SLICE - aquaculture feed premix 0.2% emamectin benzoate (EB) Sponsor Merck Animal Health EB developed for the control of sea lice Tested extensively environmental safety, efficacy, and tolerance Atlantic salmon, rainbow trout, and brown trout Fed to fish, absorbed from gut and distributed to a variety of tissues Binds to ion channels of nerve cells and disrupts transmission of nerve impulses which results in paralysis and death of parasite Excreted slowly extended period of protection (up to 9 wks) Approved in UK, Europe, Norway, Chile, and Canada Approved dosage 50 µg EB/kg fish bw/d for 7 consecutive days
3 Introduction Also shown to effectively reduce Rainbow trout Argulus coregoni Hakalahti et al. (2004) Brook trout Salmincola edwardsii Duston and Cusack (2002) Anticipate that EB will also be effective against S. californiensis Interest by many to gain approval in U.S. Requires data to support efficacy and safety Salmincola edwardsii Salmincola californiensis Conducted field efficacy trials on rainbow trout infested with S. californiensis Study conducted under a FDA-accepted protocol Argulus coregoni
4 Study Objectives At the end of each study Demonstrate a significant difference in mean abundance of adult, female S. californiensis between treated and control groups (P < 0.05) AND, Achieve percent reduction in mean abundance is 90% (treated tanks relative to control tanks) Standard for terrestrial parasiticides No standard established for fish parasiticides
5 Study Objectives Additional criteria: Infestation level in control tanks 50% of baseline infestation established in the reference population (pretreatment) Dose administered must be ± 20% of target (50 μg EB/kg fish/d)
6 Studies Conducted All female populations: SeaPac of Idaho Magic Springs Hatchery, Hagerman, ID June 2010 Fish size 31.6 cm; 400 g Clear Springs Foods #1 Snake River Research Facility, Buhl, ID June 2010 Fish size 36.2 cm; 645 g Clear Springs Foods #2 Snake River Research Facility, Buhl, ID October 2010 Fish size 33.9 cm; 517 g Mixed-sex population: Missouri Dept of Conservation Maramec Spring Hatchery, St. James, MO May 2011 Fish size 48.4 cm; 1474 g
7 Reference Population Suitable population determined by examining 30 fish Criteria: Prevalence 70% Mean abundance 3 parasites/fish Magic Springs Prevalence 93% Mean abundance 5.5 ± 4.4 Clear Springs #1 Prevalence 100% Mean abundance 7.9 ± 7.9 Clear Springs #2 Prevalence 100% Mean abundance 7.3 ± 6.0 Maramec Spring Prevalence 77% Mean abundance 6.6 ± 12.6
8 Experimental Design Treatment conditions Two (treated and control) Randomly assigned Magic 10 tanks (5 treated, 5 control) Clear Springs #1 & #2 8 tanks (4 treated, 4 control) Maramec Spring 6 boxes (3 treated, 3 control) Randomly allocated 20 fish/tank Treatment period 7 d Post-treatment period Magic 30 d Clear Springs #1 30 d Clear Springs #2 42 d Maramec Spring 42 d Fed fish 0.5 or 1.0 % bw (twice daily)
9 Data Collection Pre-study level of infestation Counted parasites on 30 fish Samples (n = 9) sent to LaCrosse FHC Definitive identification Baseline fish health evaluations 20 fish Mortality and behavior Daily Feeding behavior Daily 5 point ordinal scale (0 = not eating; 4 = ~100% of the feed ration) Water quality Water temp and DO Daily Hardness, alkalinity, ph Two times during each study
10 Data Collection Feed samples for dose verification 3 samples from medicated feed bag 1 sample from control feed bag End of study level of infestation Counted parasites on all live fish Fish sedated with MS-222 Number of fish/tank ranged from 12 to 20
11 Data Analysis Mean parasite abundance Nested ANOVA (P 0.05; two sided) % reduction in abundance Based on geometric means Treated tanks relative to control tanks Mortality Proc Glimmix (P 0.05)
12 Results In all studies: Fish behavior was normal Feeding behavior was nearly identical in treated & control tanks Treatment period all tanks ate 50-75% of feed Posttreatment period all tanks ate % of feed Water temperature, C Dissolved oxygen, mg/l Hardness, mg/l CaCO 3 Alkalinity, mg/l CaCO 3 Mean analytically verified dose in treated feed was µg/kg fish/d (2 16% below target) No EB detected in control feed
13 Mean Abundance Mean Mean Abundance (number/fish) Magic CS #1 CS#2 Maramec (P Magic < 0.001) (P CS = 0.001) #1 (P CS#2 < 0.001) (P Maramec = 0.017) Reference Population Reference Control Tanks Population Treated Tanks
14 Relative Frequency (%) Parasite Frequency (controls) Magic (N = 90 fish) CS #1 (N = 81 fish) CS #2 (N = 68 fish) Maramec (N = 42 fish) Number of parasites/fish
15 Relative Frequency (%) Parasite Frequency (treated) Magic (N = 83 fish) CS #1 (N = 77 fish) CS #2 (N = 62 fish) Maramec (N = 51 fish) Number of parasites/fish
16 Percent Reduction Magic Springs 79% 30 d post-treatment period Clear Springs #1 83% 30 d post-treatment period Clear Springs #2 96% 42 d post-treatment period Maramec 90% 42 d post-treatment period Control Treated
17 Prevalence Mean Prevalence (%) Magic CS #1 CS#2 Maramec Magic CS #1 CS#2 Maramec Reference Population Reference Population Control Tanks Treated Tanks * No stats run
18 Mortality Trial Magic Clear Springs #1 Clear Springs #2 Maramec * Mean (range) cumulative mortality (%) Treated tanks Control tanks (5 25) (0 5) (0 10) (0 5) (10 40) (0 30) (0 5) (0 7) P-value * Fish escapement during post-treatment
19 Summary Significant difference in mean abundance between treated and control tanks in all 4 studies A 90% reduction was met in 2 of 4 studies Infestation prevalence decreased substantially in all treated tanks, but remained near pre-study levels in control tanks Fish did not eat all feed offered during treatment period EB dose administered was within ± 20% of target
20 Discussion Numerous factors contributed to failure to meet 90% reduction: FDA standard brought over from terrestrial side Mean abundance skewed by 1 2 fish in each treated tank Treating individuals vs. population Continual exposure to parasites Post-treatment period duration
21 Discussion Higher mortality in treated tanks in 2 of 4 studies Differences were not statistically significant Mortality occurred in both treatment groups Not due to emamectin benzoate Roy et al no mortality in ATS and RBT when fed 7- fold higher dose Likely caused by infestation stress
22 Conclusions SLICE was effective Reducing S. californiensis infestations in male & female rainbow trout Greater level of reduction likely after a 42 d compared with a 30 d post-treatment period Future studies conducted with > 42 d post-treatment period Identify when maximum efficacy is achieved Determine period of protection
23 Status Report for each study submitted to FDA for review Requested effectiveness technical section be considered complete Submitted manuscript to North American Journal of Aquaculture
24 Acknowledgements SeaPac of Idaho Magic Springs Ken Ashley Jim Schaffer Tom Van Tassel Clear Springs Foods Scott LaPatra Bill Shewmaker Robin Burkhart Missouri DOC Maramec Spring Wesley Swee Entire hatchery staff Rangen Feeds Doug Ramsey Merck Animal Health Palma Jordan Richard Endris USFWS Eric Leis LaCrosse FHC Bonnie Johnson - AADAP Dave Erdahl - AADAP Tom Bell - AADAP
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