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Utilization of Semipurified Diets by Tautog
Author(s) -
Ramseyer Laurel J.
Publication year - 2000
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(2000)062<0125:uosdbt>2.0.co;2
Subject(s) - dry matter , biology , food science , fish <actinopterygii> , body weight , zoology , fishery , endocrinology
Experiments were conducted to determine whether semipurified diets would support growth in the tautog Tautoga onitis , a stomachless fish. Semipurified diets contained 50% protein and either 7% or 12% lipid on a dry‐matter basis. A commercial salmonid feed containing 54% protein and 15% lipid on a dry‐matter basis was used as a reference feed. Semipurified diets were either “as is,” with intrinsic pH of 5.5‐5.8 or with pH adjusted during preparation to 7.2‐7.6. Experiments were conducted with 6‐13‐g tautogs at 20°C for 28‐31 d, and diets were fed at daily rates providing 14 g protein/kg body weight. Alkalinizing the 7%‐lipid semipurified diet pH from 5.5 to 7.2 resulted in a significant ( P < 0.05) increase in tautog growth rate. However, growth of tautogs fed the reference feed was significantly ( P < 0.05) greater than growth achieved by fish fed either of the 7%‐lipid semipurified diets. Semipurified diets containing 50% protein and 12% lipid supported growth in tautog at a rate comparable to the reference feed.