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Article is devoted researches digestive some digestive enzymes at a carp, at influence on them various concentration of salt in water as is direct, and опосредованно. For finding-out of direct influence of salinity in vitro prepared for a solution so that enzymes function in the environment with the certain concentration of salt. For revealing the mediated influence, spent a set of experiences at which, in onecase, a fish maintained some time in water which salinity raised one step at a time. In another case, the fish was located in water already with the set salinity, without preliminary adaptation. During researchit has been revealed, that salinity in small concentration renders stimulating influence on activity of digestive enzymes in both cases.