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Diets for the intensive culture of Arctic grayling in Montana



Diets for the intensive culture of Arctic grayling in Montana



Progressive Fish-Culturist, 522: 88-91



A trial was conducted to evaluate the performance of Arctic grayling (Thymallus arcticus) fed one of four commercial diets - BioKyowa, Silvercup, BioDiet, and Soft-moist-or an open-formula diet series of the U.S. Fish and Wildlife Service. The study was divided into two parts, a 14-d starter period and a 63-d growth period. At the end of the starter period, Arctic grayling fed the BioKyowa diet had significantly better weight gain, survival, total length, and feed conversion (amount fed, kg/weight gain, kg) than did fish fed the other diets (P < 0.05). Survival ranged from 6 to 26% for fish fed Silvercup, BioDiet, Soft-moist, and the open-formula diet series, but averaged about 81% for fish fed the BioKyowa diet. At the end of the growth phase, Arctic grayling fed the BioKyowa diet had significantly better (P < 0.05) weight gain, increase in total length, and feed conversion than did fish fed the other diets. Survival of fish fed the BioKyowa, BioDiet, or the open-formula diet series was 78-89% . Cost of feed per kilogram of fish produced with the BioKyowa diet was US$18.90 compared with $0.84-3.17 for the other feeds. Culturists of Arctic grayling must determine if growth and survival are more important than feed cost in the intensive propagation of this species.

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Accession: 002072202

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DOI: 10.1577/1548-8640(1990)052<0088:DFTICO>2.3.CO;2



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