双齿围沙蚕群浮现象的初步观察

Observation on the Swarming Behavior of Perinereis aibuhitensis

于 2 0 0 0年 1月～ 2 0 0 0年 1 2月 ,对浙江慈溪市龙山滩涂的双齿围沙蚕的群浮进行了现埸调查 ,并对宁海湖陈港育苗厂培育的双齿围沙蚕进行了室内观察。结果表明 ,双齿围沙蚕的群浮出现在 4月下旬～ 1 0月中旬 ,海水表层温度在 1 9 0～ 2 6 2℃ ,在新月或满月之前出现群浮 ,大潮汐来临前 2～ 4d数量最多。群浮还受日照的制约 。

The swarming behavior of Perinereis aibuhitensis Grube was observed and investigated at Cixi Longshan beach in Zhejiang Province and in the Huchengang fisheries breeding factory in Ninghai during 2000.1-2000.12. The results were as follows:Swarming occurred from the middle of April to the middle of October when the surface temperature of marine water was 19 0-26 2℃. There was a swarming peak 2-4 days before the spring tide. Swarming behavior was also affected by the state of the tide and sunlight. One swarming cycle lasted for about half a month.