海南岛海水珍珠贝养殖区嵌线螺的种类、分布及危害

对海南岛３个海水珍珠贝养殖区养殖贝笼内的嵌线螺及其危害的研究表明，养殖区珍珠贝养殖笼内嵌线螺的发生具有明显的季节性和地域性：低温的１２月至翌年２月份没有发生，高温的６－７月份为发生高峰期；水温较低的北部水域出现少，水温较高的南部水域出现多。在各实验区的养殖贝笼内全年共发现嵌线螺１０种，其中毛嵌线螺Ｃｙｍａｔｉｕｍｐｉｌｅａｒｅ和环沟嵌线螺Ｃ．ｃｉｎｇｕｌａｔｕｍ为优势种。嵌线螺的捕食是造成海南岛南部海水养殖珍珠贝死亡的主要因素。

SPECIES, DISTRIBUTION AND DAMAGE OF CYMATIUM IN SEA WATER PEARL OYSTER CULTURE ZONES OF HAINAN ISLAND

On the basis of monthly observation on the three pearl oyster culturezones (the Luhintou Bay of Sanya, the Li'an Harbour of Lingshui and the XinyingHarbour of Lin'gao) in one year, 10 species of Cymatium are found, among whichCymatium pileare (Linnaeus) and C. cingulatum (Lamarck) are superior in numbers.As for the damage done by Cymatium, the situation in the southem culture zone isworse than in the northerm and that in warmer summer and autumn is worse than incolder spring and winter. Within a year, Cymatium appears mainly on June and July,and none appears from December to the next February. The predation by Cymatium isthe key reason causing death of pearl oyster in the southern culture zone of theHainan Island.