Temperature and food availability alters the physiology and aerobic capacity of tambaqui (Colossoma macropomum).

Temperature and food availability alters the physiology and aerobic capacity of tambaqui (Colossoma macropomum). Comp Biochem Physiol A Mol Integr Physiol. 2020 Apr 11;:110704 Authors: da Costa Barroso D, Almeida-Val VMF, Val AL Abstract Fish of the Amazon experience both daily and seasonal variation in temperature and food availability. In the present work, we investigated the influence of nutrient status changes resulting from feeding Colossoma macropomum five flooded forest fruits on aerobic and swimming performance. To assess the effects of diet, three groups of fish were provided different types of food. One group of was provided with commercial feed, another was given fruit feed, and the last group was not fed. The effects of temperature were tested by keeping half of each group of animals at either 26 °C or 33 °C for 30 days. After this period, the animals were transferred to either a respiratory chamber or swimming tunnel. Then, tissues were collected for relevant analyses. Results showed that C. macropomum depresses aerobic metabolism when food is withheld (27% reduction in ṀO2), and observed effects were intensified at the highest temperature (40% reduction in ṀO2 at 33 °C). Further, increased temperature negatively influenced hematological (Ht, Hb, VCM), biochemical (glucose, triglycerides, cholesterol), hepatossomatic index and enzymatic (MDH and CS in white muscle) parameters. The animals feeding commercia...
Source: Comparative Biochemistry and Physiology. Part A, Molecular and integrative physiology. - Category: Physiology Authors: Tags: Comp Biochem Physiol A Mol Integr Physiol Source Type: research