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Partial Replacement of Fish Meal with Laver Porphyra spp. in Diets for Atlantic Cod
Author(s) -
Walker Abigail B.,
Fournier Heidi R.,
Neefus Christopher D.,
Nardi George C.,
Berlinsky David L.
Publication year - 2009
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/a07-110.1
Subject(s) - gadus , biology , porphyra , fish meal , atlantic cod , juvenile , fishery , meal , zoology , feed conversion ratio , food science , algae , aquaculture , fish <actinopterygii> , body weight , botany , ecology , endocrinology
Juvenile Atlantic cod Gadus morhua (initial mean weight = 15.6 g) were fed three isonitrogenous, isocaloric diets (55% protein, 16% fat; calculated gross energy ≈ 20.5 MJ/kg) containing dried laver (nori) Porphyra spp. (red algae) to replace 0, 15, and 30% of the fish meal in a commercially available marine finfish diet. After 84 d, no differences in survival, growth, or hepatosomatic index were found among the treatment groups. The fish attained an average weight of 41.0 g, a specific growth rate (SGR) of 1.19%, and a feed conversion ratio (FCR) of 1.26. The fatty acid composition of the muscle was similar among treatment groups except that arachidonic acid levels were greater in fish given diets with 30% Porphyra replacement. These results indicate that Porphyra spp. at levels up to 30% provide a suitable fish meal replacement in diets for juvenile Atlantic cod.