东海剑尖枪乌贼的数量分布和生长特性研究

根据1994～1996年和2004～2006年东海大陆架25°30′-33°30′N，128°00′E以西海域调查资料，对剑尖枪乌贼的数量分布和生长特性进行研究，结果表明：剑尖枪乌贼渔获量高峰期出现在夏季，其资源密度指数达到20．3kg/h，其次是春、秋季，均为5．1kg/h，冬季最低。中心渔场在27°00′--28°30′N，122°30′～124°30′E和28°00′～30°30′N，124°00′～126°30′E。渔场表、底层水温分别为28～29℃和18～21℃，表、底层盐度分别为32～34和34～34．5。该种生命周期为1年，5月份出现性成熟个体，6～10月性成熟个体出现率较高，性成熟度Ⅳ期和V期达到41．3～63．5％，有春生群、夏生群和秋生群之分，夏秋季出生的群体，经过越冬后，翌年春夏季长大进行繁殖，并与春生群、夏生群一起，成为夏秋季的主要捕捞对象。为合理利用该资源，宜在夏季渔获量高峰期发展光诱作业或鱿钓作业，以提高其利用效益。

The Quantity Distribution and Growth Characteristics of Loligo edulis in the East China Sea

Abstract： Based on the investigated data in the west sea area of continental shelf of the East China Sea （25°30′-33°30′N,128°00′E） from 1994 to 1996 and from 2004 to 2006, the quantity distribution and growth characteristics of Loligo edulis was studied. The results showed that the Capture rate of Loligo edulis is 20.3 kg/h in summer, which is the fastigium of quantity distribution in a year, the capture rate is 5.1 kg/h in spring and autumn, and it＇s became the lowest in winter. The center of denseness is in 27°00′--28°30′N,122°30′～124°30′E and 28°00′～30°30′N,124°00′～126°30′E. In these fishing grounds above, the surface and bottom temperature is separately 28-29 ℃ and 8-21 ℃, and the salinity is 32-34 and 34-34.5. Loligo edulis has one year lifecycle, it＇s high frequency of maturity appears from June to October （IV-V is 41.3%-63.5%） since it matured on May. There are three colonies which are hatched in spring, in summer and in autumn respectively. The colony hatched in summer is reproduced largely in next spring and summer, and together with the other two colonies are the majoy catches. It is suggested that the lighting inducement capture and squid jigging cap-ture would be used for enhancing the use efficiency of Loligo edulis.