The effect of emersion and handling on the nitrogen excretion rates of Clarias gariepinus |
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Authors: | L G Buttle R F Uglow I G Cowx † |
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Institution: | Department of Applied Biology, University of Hull, Hull, HU6 7RX, U.K.;University of Hull International Fisheries Institute, Hull, HU6 7RX, U.K. |
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Abstract: | African catfish Clarias gariepinus (=119.9&30.6 g) were exposed to periods of emersion (5, 30, 60, 90 and 180 min) and the ammonia and nitrogen excretion rates measured following re-immersion. Immediately following re-immersion (0–30 min), the ammonia excretion and relative ammonia excretion was greatest for the 5-min emersion gro up. Exposure to extended periods of emersion resulted in a decrease in total nitrogen excretion, notably ammonia excretion, although no significant changes were observed in the non-ammonia component of C. gariepinus . |
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Keywords: | emersion handling nitrogen excretion Clarias gariepinus |
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