流沙湾海域勒氏枝鳔石首鱼生物学性状的初步研究

Preliminary study on the biological characteristics of Dendrophysa russelli in Liusha Bay

在2013年1—12月渔业资源调查数据的基础上,研究了流沙湾海域勒氏枝鳔石首鱼的体长分布、体长-体质量的关系、肥满度月变化、饵料组成、摄食强度和营养级等生物学特性。结果表明:流沙湾海域枝鳔石首鱼体长82~145 mm,优势体长组为116~125 mm和106~115 mm;体长(L)-体质量(W)关系方程为:W=0.0242L^(2.9564)(R^2=0.9471);肥满度最大值出现在2月份,最小值出现在7月;枝鳔石首鱼的饵料组成以甲壳类为主要类群。枝鳔石首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;营养级变化范围在2.69~3.11,平均营养级为2.94。

The biological characteristics of Dendrophysa russelli including body-length distribution,relation of body length and weight,tidiness monthly ehanges,food composition,feeding intensity and tmphic level,were analyzed based on the fsheries data collecled in the Liusha Bay from January 2013 to December 2013. The results showed that the body length of D. russelli ranged from 82 to 145 mm,and the dominant body length groups were 116-125 mm and 106-115 ram. The relationship between body length （L） and weight （W） was expressed as W=0.0242Lz9564（R^2=0.9471 ）. The maximum of fullness was observed in Feb. and minimum in Jul. Crustacean was the main group in food composition. Empty stomachs were significantly changed with seasonal variations （P〈 0.05）,and the maximum was observed in winter and minimum in spring. The maximum of plumpness index was observed in autumn and minimum in winter. The main trophic levels were 2 and 3,with an average of 2.94.