Oceanographic Condition in the Distribution Aras of Anchovy Engraulis Japonicus in the Yellow Sea and East China Sea

摘要

Based on the data obtained from the cooperative surveys by China and Norway from 1984 to 1994, this paper deals with the hydrographic characteristics of distribution areas of anchovy in the Yellow Sea and East China Sea from November to May. The relationships between distribution of anchovy and hydrographic environment are also analyzed in this paper. The main research findings are briefly given bellow. (1) From November to March, the water temperature continually decades and meanwhile the defense areas of anchovy move from north to south. Th high schooling areas of anchovy are mainly distributed in the warm of cold front areas with temperature of 11-13 deg C. (2) In November and December, the yellow Sea cold watermass exits roughly between 50m depth and sea bottom. The thermo-halocline is approximately located at the 30￣50m depth and the anchovy is usually distributed above the thermo-halocline IN January and March, the Yellow Sea cold watermass disappears and the fish school s are distributed at the middle and lower depths, even sea bottom.