Global warming of climate on all planet influences cycles of development of the Japanese scallop Patinopecten (Mizuhopecten) yessoensis. In this paper, the short and long term ecological effects of hydrological parameters are considered to influence the Japanese scallop. Under comparison of duration of all four periods in development of Japanese scallop in periods of 1970-1990 and 1999-2008 there could be remarked, that the duration itself was not changed but maximum and minimum durations were decreased. Average long-term productivity was risen for all periods of survey viewing last years from 476 specimens/m² to 640 specimens/m², and 1998-2008 – 950 specimens/m²).