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Pilot Field Trial to Evaluate SLICE (0.2% Emamectin Benzoate)–Medicated Feed to Reduce a Natural Infestation of Salmincola californiensis in Freshwater‐Reared Rainbow Trout
Author(s) -
Gunn Carolyn,
Carty Daniel,
Walker Peter G.,
Colburn Patricia A.,
Bowker James D.
Publication year - 2012
Publication title -
north american journal of aquaculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.432
H-Index - 41
eISSN - 1548-8454
pISSN - 1522-2055
DOI - 10.1080/15222055.2012.676015
Subject(s) - biology , rainbow trout , infestation , broodstock , raceway , emamectin benzoate , fishery , veterinary medicine , trout , zoology , aquaculture , toxicology , fish <actinopterygii> , ecology , botany , pesticide , medicine , physics , finite element method , thermodynamics
Salmincola spp. infestations can adversely affect freshwater‐reared salmonids. Control methods tested to date have had limited success; consequently, we conducted a pilot field trial to evaluate SLICE (0.2% emamectin benzoate [EB])–medicated feed to reduce a natural infestation of S. californiensis in freshwater‐reared rainbow trout Oncorhynchus mykiss . Before the trial started, 96 of 1,500 rainbow trout broodstock held in a flow‐through raceway were impartially captured, sedated, uniquely tagged, and returned to the raceway. Pretreatment S. californiensis infestation prevalence and intensity were 97% and 10.4 ± 7.6 (mean ± SD) adult female parasites per fish, respectively. Treatment was administered at 50 μg EB·kg fish −1 ·d −1 for 7 d. By the end of the trial (43 d posttreatment), infestation prevalence and intensity had decreased to 32% and 1.6 ± 1.1 adult female parasites per fish, respectively. These results suggest that SLICE‐medicated feed can be used to reduce natural infestations of S. californiensis in freshwater‐reared rainbow trout.