渤海经济无脊椎动物生态特点的研究

ECOLOGY OF THE ECONOMIC INVERTEBRATES IN THE BOHAI SEA

The invertebrate in the Bohai Sea is mainly warm water species of the Subtropical zone. The seasonal moving distance of most invertebrates perched in the Bohai Sea is small. Only during the period of low temperature, a few species migrate distantly for wintering. The seasonal variation of the catch of the invertebrate in the Bohai Sea is great. During the low temperature period in january, the average catch in number is 190 tails. In august and September, the average catch in number is 3,440 tails and 3,377 tails because of the complement of new colony born in this year. Five species of shirmp and cephalopod have the habit of seasonal migration. They are the important fishery resources in the Bohai Sea.