Abstract
1. 1. Acid phosphatase activity, as an index of lysosomal activity, of the cytoplasmic fraction of gill tissue transiently increases during the FW adaptation of the mullet, Chelon labrosus. 2. 2. A concomitant and unexpected DNA decrease occurs. Moreover, RNA/DNA ratio in the nucleimitochondria fraction increases with the continuance of FW adaptation, while the DNA renewal of gill tissue is enhanced in the fully adapted FW mullet. 3. 3. The use of histologic techniques indicates that chloride cells are probably concerned with AcPase and DNA changes. 4. 4. These results are discussed with regard to the renewal and differentiation of two chloride cell populations. In addition, a model for the control of chloride cell populations in gill epithelium of C. labrosus, is suggested.
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