Dietary lipid sources affect cold tolerance of Nile tilapia (Oreochromis niloticus).
J Therm Biol
; 79: 50-55, 2019 Jan.
Article
em En
| MEDLINE
| ID: mdl-30612685
ABSTRACT
This study was carried out to evaluate the effects of dietary lipid sources on growth performance, fatty acids composition and cold tolerance of Nile tilapia (Oreochromis niloticus) fingerlings (7.00⯱â¯0.50â¯g/fish). The fish were fed four isonitrogenous (28% crude protein), isocaloric (500â¯kcal/100â¯g) diets containing four lipid sources; fish oil (FO), corn oil (CO), coconut oil (COCO) or fish oil/ corn oil mixture (11 ratio) (oil mix). The diets were offered to the fish at a daily rate of 3% of their body weights (BW), twice a day for two months. After the feeding trial, the fish were exposed to decreasing water temperature from 25 °C until the appearance of death symptoms. The results revealed that FO-based diets (FO and oil mix) produced the best growth rates and feed efficiency, followed by corn oil diet, while COCO resulted in the lowest performance. Fish fed on CO and oil mix showed higher body unsaturated fatty acids (UFA) and lower lethal temperature than those fed on FO- or COCO-based diets. These results indicate that cold shock can modify the lipid metabolism in Nile tilapia by lowering total body saturated fatty acids and raising n-6 and n-3 UFA. This finding suggests that the inclusion of high levels of plant oils in Nile tilapia feeds can enhance their cold tolerance.
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Texto completo:
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Tilápia
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Temperatura Baixa
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Aclimatação
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Ração Animal
Limite:
Animals
Idioma:
En
Revista:
J Therm Biol
Ano de publicação:
2019
Tipo de documento:
Article