Open AccessReplacement of fish oil with a DHA ‐rich Schizochytrium meal on growth performance, activities of digestive enzyme and fatty acid profile of Pacific white shrimp ( Litopenaeus vannamei ) larvae
Author(s) -
Wang Y.,
Li M.,
Filer K.,
Xue Y.,
Ai Q.,
Mai K.
Publication year - 2017
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/anu.12479
Subject(s) - shrimp , litopenaeus , biology , fish meal , meal , docosahexaenoic acid , food science , fish oil , polyunsaturated fatty acid , zoology , fatty acid , digestive enzyme , fishery , biochemistry , enzyme , fish <actinopterygii> , amylase
Abstract This trial was conducted to evaluate the effects of replacing dietary fish oil with Schizochytrium meal for Pacific white shrimp ( Litopenaeus vannamei ) larvae (initial body weight 4.21 ± 0.10 mg). Six test microdiets were formulated using Schizochytrium meal to replace 0 g/kg, 250 g/kg, 500 g/kg, 750 g/kg, 1000 g/kg or 1500 g/kg fish oil DHA . No significant differences were observed in survival, growth, final body length and activities of digestive enzyme among shrimp fed different diets ( p > .05). No significant differences were observed in C20:5n‐3 ( EPA ) in muscle samples ( p > .05). C18:3n‐3 and C20:4n‐6 in muscle increased as Schizochytrium meal replacement level increased ( p < .05). No significant differences were observed in C22:6n‐3 ( DHA ) and n‐3 fatty acids among shrimp fed diets that algae meal replaced 0 g/kg ‐ 1000 g/kg of fish oil. Shrimp fed diet R150 had higher DHA content than other groups and had higher n‐3 fatty acids than that of shrimp fed diets R50, R75 and R100 ( p < .05). C18:2n‐6, PUFA and n‐6 fatty acids in muscle increased, while n‐3/n‐6 ratio decreased with increasing algae meal replacement level from 0 g/kg to 1000 g/kg ( p < .05). In conclusion, Schizochytrium meal could replace 1500 g/kg fish oil DHA in the microdiets without negatively affecting shrimp larvae survival, growth and activities of digestive enzyme.