Quantitative distribution and biological characteristics of Solenocera crassicornis in northeast Fujian outer-sea

In base of the survey data of shrimps in northeast Fujian outer-sea (2600~2800N，12000~12530E) in May, August, November of 2008 and February of 2009, we analyzed the quantitative distribution and biological characteristics of Solenocera crassicornis. The results show that S.crassicornis widely distributes with an occurrence frequency of 31.9%, and the ratio of its catch in total catch is 9.8%. The average density of resource is 7.21 kgkm-2 (May: 34.7 kgkm-2, August: 13.8 kgkm-2, November: 4.55 kgkm-2, February: 2.89 kgkm-2). Significant seasonal difference is found in the distribution, especially high in August and November (83.0%), and low in February and May. S.crassicornis distributes most in the waters at depth of 80 m. The body length is 36~126 mm, and that of the dominant species is 50~95 mm (66.8%); the size of female (7.3 g) is obvious bigger than that of male (3.4 g) with the sex ratio of 1:0.47. The maturity stages for female is mainly at Ⅱ and Ⅲ, accounting for 44.3% and 36.3%, respectively; the peak period of reproduction is from May to August. No significant difference is found in feeding intensityamong different seasons and betweendifferent sex.