论文部分内容阅读
本文研究了福建东山岛附近海域斑生物量、密度的分布及其季节变化；生长和死亡特点；摄食和生殖习性。其平均月生物量为２２２．１ｋｇ／ｋｍ２，占游泳生物月总生物量的２７．２２％，成为优势种；生物量和密度冬季最高，分别为５２４．９ｋｇ／ｋｍ２和９３３２尾／ｋｍ２，比最低的春季高２２．７７倍和８６．２１倍。分布区域性差异明显，东山湾内高达４３８．２ｋｇ／ｋｍ２和７４０５尾／ｋｍ２，比湾外高７７．７１倍和６８．３８倍；渔获由０～Ⅳ龄组构成，ｌ龄组为优势，叉长分布范围为１１１～２２３ｍｍ，以１４１～１６０ｍｍ组为优势；食料以硅藻类的菱形藻、海线藻、圆筛藻、直链藻和骨条藻的数量最多，并大量摄食有机碎屑；初次性成熟的最小年龄为１龄．最小叉长雌性为１４６ｍｍ，雄性１４０ｍｍ。雌雄性均在１５１～１７０ｍｍ组成熟，生殖期在冬季至初春；生长参数为Ｌ∞＝２４６．３７ｍｍ，Ｗ∞＝１８２．６５ｇ，ｋ＝０．４３０３，ｔｏ＝－０．８６４９，体重生长拐点年龄人ｔｒ＝１．６０１７龄；瞬时总死亡率为１．２０１６。关键词
In this paper, the distribution of spot biomass and its density in the sea area near Dongshan Island, Fujian Province, and its seasonal variation; the characteristics of growth and mortality; the habit of feeding and reproduction were studied. The average monthly biomass was 222.1 kg / km2, accounting for 27.22% of the total monthly biomass of swimming organisms, becoming the dominant species. The biomass and density were the highest in winter, 524.9 kg / km2 and 9332 / km2, respectively The lowest spring was 22.77 times and 86.21 times higher. The distribution of regional differences is obvious, Dongshan Bay up to 438.2kg / km2 and 7405 tail / km2, 77.71 times higher than the Bay and 68.38 times higher; catches by the 0 ~ Ⅳ age group, l-group advantage, Fork length distribution range of 111 ~ 223mm, 141 ~ 160mm group for the advantage; food materials to diatom Rhodochrosite, Sea algae, round sieve algae, Strains and Skeletonema algae the largest number, and a large number of consumption of organic debris ; The minimum age of first sexual maturity is 1 year old. Minimum fork length Female 146mm, male 140mm. Both male and female were mature in 151-170 mm group, and the reproductive period was from winter to early spring. The growth parameters were L∞ = 246.37mm, W∞ = 182.65g, k = 0.4303, to = -0.8649, Age tr = 1.6017 years; the instantaneous total mortality was 1.2016. Key words