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The influence of NaCl solutions on the hardening process of egg membranes of the trout, Salmo trutta • L. was investigated. Experiments have proved that the processes connected with absorption of water and with hardening of the membra nes may take place even in a habitat of a considerable salinity, but their initiation must be preceded by at least a short period of immersion of the egg in fresh water. It is the authors' intention to try to explain the phenomenon of a different effect ofdoi:10.3750/aip1974.04.2.02 fatcat:sfoqciqe3nh6hbgfbvhchjtp6u