期刊
FISH PHYSIOLOGY AND BIOCHEMISTRY
卷 47, 期 4, 页码 829-839出版社
SPRINGER
DOI: 10.1007/s10695-021-00944-7
关键词
Aquaculture; Cold shock; Nutrition; Hematology; Energy metabolism; Oxidative stress
资金
- Agencia Nacional de Promocion Cientifica y Tecnologica [PICT-2016 1911]
- Consejo Nacional de Investigaciones Cientificas y Tecnicas [PIP-112 201501 00942 CO]
- Universidad Nacional del Litoral [CAI+D 2016-50420150100016LI]
The study aimed to analyze the cold stress effects in Piaractus mesopotamicus and their mitigation by a Pyropia columbina red seaweed-supplemented diet. Results showed an increase in hemoglobin levels and lipid oxidative damage in fish exposed to low temperature. The red seaweed-supplemented diet did not have a mitigating effect on cold stress in pacu, but affected physiological indicators such as hemoglobin levels and cholesterol concentration.
This study aimed to analyze the cold stress effects (in terms of hematology, energy reserves, and oxidative stress) in Piaractus mesopotamicus (pacu) and their mitigation by a Pyropia columbina red seaweed-supplemented diet. For this purpose, juvenile fish were fed with a control (CD) or a red seaweed-supplemented diet (RD) for 60 days, and then, the animals were exposed to a low temperature (14 degrees C) and a control temperature (24 degrees C) for 24 h. The cold shock generated an increase of hemoglobin levels in fish fed with both diets. In CD-fed fish, plasmatic triglycerides, cholesterol, and hepatic glycogen decreased after the thermal shock; meanwhile, the animals fed with RD showed decreased hepatic proteins, but increased cholesterol and hepatic glycogen. Regarding oxidative stress, antioxidant enzymes augmented their activity in the liver, intestine, and gills; meanwhile, lipid oxidative damage was observed in the liver and intestine of fish exposed to 14 degrees C and fed with both diets. Pacu was sensitive to cold shock, but no mitigation effects were observed in fish fed with the supplemented diet. Further research should target higher concentrations of P. columbina in supplemented diets to take advantage of this valuable resource.
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