Differences in the Responses of Two Mudskippers to Terrestrial Exposure

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The concentration of NH_4^+ in the plasma and muscles of Periophthalmodon schlosseri and Boleophthalmus boddaerti increased significantly after exposure to terrestrial conditions for 24 hr. Such increases in NH_4^+ concentrations in B. boddaerti were not accompanied by any significant increase in urea concentrations. However, significant increases in urea concentrations occurred in the plasma, liver and muscle of P. schlosseri kept away from water. Results obtained indicate that the liver may be a major organ involved in urea production in this mudskipper. In addition, there were significant increases in the concentrations of total free amino acids in the plasma, liver and muscle of P. schlosseri, but not in those of B. boddaerti, after 24 hr of terrestrial exposure. Terrestrial exposure also affected the aminating and deaminating activities of glutamate dehydrogenase from the liver of P. schlosseri, leading to a significant increase in the aminating/deaminating ratio. It is concluded that P. schlosseri, having developed a greater affinity to land than B. boddaerti, has also acquired a greater capacity to detoxify ammonia.
1993-06-15