舟山漁場岱衐洋、大戢洋餌料浮游动物初步調查

A PRELIMINARY STUDY OF THE ZOOPLANKTON OF THE CHU-SAN REGION,AT TAICHU-YANG AND DAJIE-YANG

摘要:

海洋浮游动物是鱼类、甲壳类、贝类等动物的基本食料;并且对经济鱼类的栖息、洄游、索饵、鱼类大量进入渔区等方面有密切的关系。同时,浮游动物的数量,在一定程度上可以反映出海洋坏境的变化情况。因此,调查一个海区中浮游前物种类的分布及数量变动的规律,可有助于了解或预报那里渔业资源的变动。

Abstract:

The present report deals with the zooplankton of the foodstuff collected along theTaichu-Yang and Dajie-Yang of the Chu-San region duritig 1960-1961. The results are asfollows: The average total biomase of zooplankton is 88 mg/m³ in this region, and the higbestis 140 mg/m³ in July and the lowest is 4 mg/m³ in February. In general, it reaches a maximum in summer and a minimum in winter. Its seasonal va-riation is just the same as the water temperature. There are 100-250 mg/m³ of the total biomass of zooplankton distributed in the southeastof the fishing ground and 250-500mg/m³ distributed outside of it. The dominant zooplanktons are the eurythermic low-saline neritic species and the brackishwater estuarine species. They are the Labidocera cuchacta, L. bipinnata, Contropages dorsispin-atus, Tortanus vermiculus, Schmackeria poplesia, Gastrosacous ko jimacnsis, Acctes ohinensis,etc., and are mainly distributed in the west of the fishing ground and Hangchow-Bay. Thereare also high-saline oceanic species, including Calanus parper, Undinula vulgaris, Eucalanuscrassus, Euchact plana, Sagitta bedoti, S. enflata, etc. They are mainly distributed in thesouth and southeast of the fishing ground.