Oxygen consumption, carbon dioxide output and nitrogen excretion in cichlid fish,Oreochromis mossambicus (Peters), with special reference to swimming speed
Oxygen consumption, carbon dioxide output, nitrogen excretion, respiratory quotient, ammonia quotient and nitrogen quotient in cichlid fish,Oreochromis mossambicus (Peters) acclimated to and tested in freshwater at 30°C, were obtained with special reference to swimming speed (20–77 cm/sec). Tilapia continuously swimming for 5 hr derived energy both from aerobic and anaerobic sources during the initial phase of exercise, whereas during the later phase the energy utilization is completely from aerobic source, as it is evident from respiratory quotient values. It also utilized more proteins for energy during the later phase of exercise, as evident from the increased ammonia-N as well as total N excretion and the respective quotients. The increased protein utilization may be of advantage in maintaining acid-base balance and also in conserving (Na+) in fish.
N Sukumaran1 2