南海西北部水域斑节对虾资源的调查研究

STUDIES ON PENAEUS MONODON RESOURCE IN NORTHWESTERN WATERS OF SOUTH CHINA SEA

1989－1991年对南海西北部水域进行斑节对虾Penaeusmonodon资源专项调查。结果表明,斑节对虾的密集分布区在海南岛东部和南部海区,其现存资源量为82．6万尾,周年有体长30mm以下的幼虾出现。主要产卵期在9－12月。产卵场在海南岛东部和南部水深30-60m的海区。

The resource survey of Penaeus monodon in the northwest waters of South China Sea has been reported in this paper. The survey range is from the north of the Beibu Gulf to the waters around the Hainan Island, with water depth within 60m. As the seabed is complex, different fishing gears of trawl, trammel net, two-stick stow net and cage-type stow net have been used. The results show that the catch of Penaeus monodon distributes mostly in the waters to the east and south of the Hainan Island. The young shrimp (BL < 30mm), distributing only in the estuary of eastern and southern Hainan Island, can be seen all the year round. The quantity of young shrimP is the highest in November, and reduces then. The spawning seaso is almost through a year and the peak occurs from September to December, when the ovary matures and ovulates by stages. The spawning area is located to the east and south of the Hainan Island, with water depth between 30 and 60 meters. The diets of Penaeus monodon vary widely, mainly composed of small-sized benthos, then small-sized nekton and plankton. There is no obvious change in feeding habit.