闽东北外海渔场银方头鱼渔业生物学初步研究

PRELIMINARY STUDY ON FISHERIES BIOLOGY OF YELLOW HORSEHEAD BRANCHIOSTEGUS ARGENTATUS ON THE FISHING GROUND OFF NORTHEAST FUJIAN

闽东北外海底层流刺网作业渔获的银头鱼群体由1～6龄11个世代构成,以2、3和4龄占优势;体长优势组为210～270mm,体重优势组为200～400g,体长与体重的关系W=2.1120×10^(-5)×L^(2.9964)r=0.9970。初次性成熟年龄为2～3龄,最小性成熟个体体长为190mm,在4～8月均有产卵活动;按von Bertalanffy方程拟合生长参数:L_(∝)=436.21mm,W_(∝)=1715.05g,k=0.2357,t_0=-0.9542,体重生长拐点年龄为3.702龄。

Yellow horsehead Branehiostegus argentatus caught by bottom drift net on the fishing ground off Northeast Fujian are composed of 11-year classes,from age 1 to age 6 of which the dominant age group was from age 2 to age 4. The dominant body length was 210 to 270mm, and the dominant body weight 200g to 400g. The relationship between body length and weight -is W = 2. 1120 × 10-5 × L2.9964 r = 0. 9970. The age of first sexual maturity was age 2 to 3. The minimum body length of sexual maturity was 190mm. It had reproductive activities during April to October. The parameters of growth equation of von Bertalanffy were; L∞ = 436.21mm, W∞ = 1715.05g, k = 0.2357, t0 = -0.9542, the age of weight growth corner age was 3.702.