Budget Amount *help |
¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1989: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 1988: ¥1,500,000 (Direct Cost: ¥1,500,000)
|
Research Abstract |
The new hypothesis (Itazawa and Oikawa, 1983) to interpret the decrease in the metabolic rate per unit body mass of an animal with increasing body mass was proved to be valid in a freshwater teleost, Cyprinus carpio (Itazawa and Oikawa, 1986). This study was designed to examine the validity of the hypothesis with a marine teleost, Pagrus major. In 1988-1989, the hypothesis was examined qualitatively. Tissue metabolic rate per unit body mass Q_<O2> was high in the intestine, the pyloric caeca, and the brain, and very low in the trunk composed mainly of white muscle. The former organs showed a negative allometry in its relative growth, and the latter part a positive allometry. These results imply that the metabolic rate in vitro of the whole body per unit body mass decreases with increasing body mass. Therefore the hypothesis was qualitatively supported. In 1989-1990, the hypothesis was examined quantitatively. Tissue metabolic rate per unit body mass Q_<O2> was expressed by an equation Q_<O2> = cW^d. Part mass P was expressed by another equation P = kW^s.Therefore the metabolic rate in vitro per unit body mass m is expressed a combined equation m = c・kW^<d+s> . The metabolic rate in vitro of a whole body per unit body mass M _<in vitro>/W was calculated by an equation M _<in vitro>/W =ZETAm/SIGMAP, and was found to be expressed by an equation M _<in vitro>/W = 1.97W^<-0.189>. The metabolic rate in vivo of a living Pagrus per unit body mass M _<in vivo>/W was found to be expressed by an equation M _<in vivo> = 6.29W^<-0.178> . The power in the former equation -0.189 approximately coincided with the power in the latter one -0.178. Therefore the hypothesis was quantitatively supported.
|