Low temperature stress in a cultured fish (Piaractus mesopotamicus) fed with Pyropia columbina red seaweed-supplemented diet

ALE, ANALÍA; BACCHETTA, CARLA; ROSSI, ANDREA S.; SCARABOTTI, PABLO A.; CAZENAVE, JIMENA

FISH PHYSIOLOGY AND BIOCHEMISTRY

SPRINGER

Año: 2021

0920-1742

This study aimed to analyze the cold stress effects (in terms of hematology, energy reserves, andoxidative stress) in Piaractusmesopotamicus (pacú) and their mitigation by a Pyropia columbina red seaweedsupplemented 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 generatedan increase of hemoglobin levels in fish fed with both diets. In CD-fed fish, plasmatic triglycerides, cholesterol, and hepatic glycogen decreased after the termal shock; meanwhile, the animals fed with RD showed decreased hepatic proteins, but increased colesterol 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 to14 °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.