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A combination of plant oils promotes adequate growth of the freshwater catfish R hamdia quelen ( Q uoy & G aimard 1824)
Author(s) -
Vargas Rodrigo Javier,
Garcia Alexandre Sachsida,
Baggio Sueli Regina,
CargninFerreira Eduardo,
Fracalossi Débora Machado
Publication year - 2015
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/are.12466
Subject(s) - biology , catfish , food science , linoleic acid , docosahexaenoic acid , linseed oil , fish oil , sunflower oil , fatty acid , polyunsaturated fatty acid , zoology , biochemistry , fish <actinopterygii> , fishery
Abstract Essential fatty acids should be included in the diet to ensure adequate fish growth. Despite the great number of studies on fatty acid nutrition of fish, there are still several unknowns. The aim of the present study was to investigate fatty acid nutrition of jundiá, a Latin American freshwater catfish. Four diets were formulated containing (i) coconut oil (−C, negative control), (ii) coconut oil + high‐docosahexaenoic‐acid‐fish oil (+C, positive control) and coconut + sunflower + linseed oils at different ratios, producing either (iii) a diet rich in linoleic acid ( LA ) (High LA ) or 4) a diet low in LA (Low LA ). All diets contained significant amounts of saturated fatty acids (at least 57.5% total fatty acids in High LA ) and monounsaturated fatty acids (at least 19.1% total fatty acids in −C). Diets were fed to jundiá fingerlings (1.5 g) for 70 days; growth, body composition and liver histology were evaluated. The −C diet, without essential fatty acids, promoted significantly lower fish growth, body fat accumulation and hepatic lipidosis. Fish fed High LA and Low LA diets presented similar growth as fish fed +C diet. These findings suggest that diet formulations for jundiá catfish fingerlings can include only plant oils without negative effect on growth, survival, body composition, fish health or parameters of feed utilization (ingestion rate and protein utilization).