流沙湾海域皮氏叫姑鱼生物学特性的初步研究

Preliminary Study on the Biological Characteristics of Johnius belangerii in Liusha Bay

在2013年1月-12月渔业资源调查数据的基础上,研究了流沙湾海域皮氏叫姑鱼的体长分布、体长(L)-体质量(W)的关系、肥满度、饵料组成、摄食强度和营养级等生物学特性.结果表明:流沙湾海域皮氏叫姑鱼体长80-191 mm,平均139 mm,其中优势体长组为121-140 mm;体长-体质量关系方程为:W=0.0134L3.1718(R2=0.9734);肥满度最大值出现在2月份,最小值出现在4月份;皮氏叫姑鱼的饵料组成以甲壳类为主要类群.皮氏叫姑鱼的空胃率随季节变化显著(P<0.05),在冬季最大,春季达到最小;饱满度指数在秋季最高,冬季最低.充塞度等级显示,在春季,主要以0级和1级为主;在秋季,充塞度在1级以上的比例最高;结果显示营养级以2、3级为主,平均为3.06,随着体长的增加,营养级也增加.

The biological characteristics of Johnius belangerii, including size distribution, relation of body length and weight, condition factor, food composition, feeding intensity and trophic level, were analyzed based on the fisheries data collected in Liusha Bay from January to December 2013. The results showed that the body length of Johnius belangerii ranged from 80 to 191 mm, with an average of 139 mm, and the dominant body length group was 121 -140 mm. The relationship between body length （L） and weight （W） was expressed as W =0. 0134L3 1718 （R2 =0. 9734）. The maximum of condition factor was observed in February and minimum in April. Crustacean was the main group in food composition. The percentage of empty stomachs was significantly changed with seasonal variations （P 〈 0. 05 ）, and the maximum was observed in winter and minimum in spring. Most of the fish had saturation level of stage 0 and 1 in spring, and rate which above stage 1 reached the peak in autumn. The main trophic levels were 2 and 3, with an average of 3.06, and trophic levels increased with body length.