Low temperature stress in a cultured fish (Piaractus mesopotamicus) fed with Pyropia columbina red seaweed-supplemented diet.
This study aimed to analyze the cold stress effects (in terms of hematology, energy reserves, and oxidative stress) in Piaractus mesopotamicus (pacú) 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 °C) and a control temperature (24 °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 °C and fed with both diets. Pacú 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.
['Ale|Analía|A|', 'Bacchetta|Carla|C|', 'Rossi|Andrea S|AS|', 'Scarabotti|Pablo A|PA|', 'Cazenave|Jimena|J|']
D000818:Animals D060125:Characiformes D058639:Cold-Shock Response D004032:Diet D019587:Dietary Supplements D029941:Fish Proteins D005880:Gills D005980:Glutathione Reductase D005982:Glutathione Transferase D006003:Glycogen D007413:Intestinal Mucosa D050356:Lipid Metabolism D008099:Liver D009132:Muscles D018384:Oxidative Stress D000461:Rhodophyta D012624:Seaweed D013482:Superoxide Dismutase D017392:Thiobarbituric Acid Reactive Substances
Hematology Oxidative stress Cold shock Aquaculture Energy metabolism Nutrition