Standard and routine metabolic rate, critical oxygen tension and spontaneous scope for activity of tilapias
1986
Becker, K. | Fishelson, L. (Hohenheim Univ., Stuttgart (Germany). Inst. of Animal Production in the Tropics and Subtropics)
It was the aim of the present study to do comparative tests with four tilapia species and four hybrids under identical conditions on the level of standard, routine and active metabolism to get their specific requirements in different environments. The respiration measurements were carried out with the help of fully automatic computer-regulated equipment, enabling continuous 24-hour measurements of the oxygen intake in up to 16 respirometers. The experiments were done at the Institute of Zoology of Tel Aviv University, Israel, using electrophoretically clearly identified fishes. With the exception of Oreochromis aureus x S. galilaeus F1, the standard metabolic rates (SMR) of all hybrids tended to be higher than those of the pure-bred species. Apart from O. niloticus x S. galilaeus the routine metabolic rate (RMR) was also on a higher level. The clearly diverging scope for spontaneous activity (SSA) in red tilapia is of interest in this context. Further, the metabolic reactions were investigated at higher water temperatures (30-35 deg C), exceeding the optimum temperature range. The temperature effects on "handling stress" and the critical oxygen point (Pc) are also discussed.
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