Premium
A Preliminary Study on the Dietary Protein Requirement of Larval Japanese Flounder Paralichthys olivaceus
Author(s) -
Bai Sungchul C.,
Cha YoungTaeg,
Wang Xiaojie
Publication year - 2001
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 - 10.1577/1548-8454(2001)063<0092:apsotd>2.0.co;2
Subject(s) - paralichthys , olive flounder , biology , flounder , zoology , composition (language) , hatching , larva , fish meal , weight gain , food science , fishery , live food , body weight , fish <actinopterygii> , aquaculture , ecology , endocrinology , linguistics , philosophy
This experiment was conducted to estimate the dietary protein requirement of larval Japanese flounder Paralichthys olivaceus (also known as the olive flounder) and to examine the effects of a commercial diet and three experimentally developed microparticulate diets (MPDs) on their growth and body composition. Larvae were fed four MPDs for 75 d beginning 8 d after hatching (DAH); fish in these experimental diets were also concurrently fed live feeds until 45 DAH, as is the normal procedure in commercial hatcheries. One MPD was a commercial diet (CD) of marine fish in which crude protein ranged from 55.8% to 61.2% (dry weight basis; varied with pellet size); the three laboratory‐prepared diets based on Japanese flounder muscle contained either 40% (D 40 ), 50% (D 50 ), or 60% (D 60 ) crude protein. At 83 DAH, body weights and lengths of fish fed diet D 60 were not significantly different from those fed diet CD. Fish fed diet CD had significantly greater body weights and lengths than those fed diets D 40 and D 50 . Percent survival and whole‐body compositions of moisture, protein, and ash were not influenced by dietary treatments during the 75‐d experimental period. Although whole‐body fatty acid composition generally was not significantly different among diet treatments, fish fed diet CD had significantly greater α‐linolenic acid (C18:3ω3) by the end of the experiment. The results suggest that the optimum dietary protein level for maximum growth and survival of Japanese flounder larvae should be 60% or more. The experimentally developed MPD therefore shows potential utility, and additional nutritional research with Japanese flounder larvae is warranted.