Physiological Response of Triploid Rainbow Trout to Exhaustive Exercise

Kobayashi Toru, Fushiki the late Shozo, Ueno Koichi

doi:10.11233/aquaculturesci.57.361

Physiological changes during exhaustive exercise for 0-15 min and during the recovery process from 6 min exhaustive exercise were compared between triploids and diploids of all female rainbow trout progeny. Before the exhaustive exercise, the hemoglobin content in the spleen of triploid fish was significantly higher than that of diploids. Once the triploid fish was forced to perform exhaustive exercise, the relatively large triploid spleen was reduced to the same size as the diploid spleen until 1 min after the start of exercise. Thus the reduction in ratio of the weight of the triploid spleen with respect to the body weight with exercise was higher than that of the diploid spleen. The red blood corpuscle number significantly increased following the exhaustive exercise in both ploidies, but the ratio of increase was markedly higher in the triploid fish. The physiological recovery of triploid measured in terms of blood components following the exhaustive exercise was delayed by about 30 min compared with the diploid. The triploid fish required a longer time to recover than the diploid. Both the diploid and triploid fish recovered to their normal state 24 hours after the 6-min exhaustive exercise. Thus, it is presumed that triploids require a larger supply of red blood corpuscles to the blood during the exhaustive exercise than diploids, and the ability to supply red blood corpuscles is higher in triploids due to enlargement of the spleen.

Physiological Response of Triploid Rainbow Trout to Exhaustive Exercise

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