黄渤海蓝点马鲛当年幼鱼的生长特性

THE CHARACTERISTICS OF GROWTH FOR SPANISH MACKEREL UNDERYEARING IN THE YELLOW SEA AND BOHAI SEA

本文根据 1963—1991年6月至翌年3月间收集的8627尾样品体长和体重资料,引用 von Bertalanffy 生长方程对黄渤海蓝点马鲛当年幼鱼生长特性进行分析。结果表明:蓝点马鲛当年幼鱼体重与体长之间呈 W=aL^b 相关关系,b 波动于 2.9867—3.0355 之间;一般生长型为 L_?=422.84[1-e^(-0.1?(t-2.18)],W_t=629.66[1-e^(-0.1?(t-2.18)]~?,以8月1日至11月1日为体重主要生长期;生长存在年间差异,生长参数 L_∞、W_∞、k分别由 1963—1969 年的 438.00mm、675.82g、0.1366 变化到 1990—1991 年的 399.06mm、512.16g、0.2307,体重主要生长期则由8月11日至11月11日提前到8月1日至10月11日。从当年幼鱼生长特性考虑,其秋汛首捕渔期推迟到10月21日之后为宜,以达到蓝点马鲛渔业资源的合理利用。

Spanish mackerel Scomberomorus niphonius is one of the maincommercial fishes in the China sea. Based on the biological date of 8627 sa-mples which collected from commercial catches in the Yellow Sea, Bohai Sea andnorthern East Sea during June to March (next year) in 1963--1991, this paperdiscribed the characteristics of growth of spanish mackerel underyearing as fol-lows: 1. The relationship between body length (L) and body weight (W) is W =8.7231×10^(-8.0838) (r = 0.9994). The parameter branges within 2.9868--3.0355 indifferent year 2. The general pattern of the growth is expressed by von Bertalanffy growthequation as; L_τ = 422. 84[1-e~[(-0.1838)(t-2.18)]]; W_t = 629. 66[1-e~[(-0.1388)(t-2.18)]]~3. The grow-th inflection for body weight is in 10.11 (a period of 10 days) and the growth israpid before November 1 for body length and during August 1 to November 1 forbody weight. 3. There are fluctuations of the growth for the different year. The growthdiffers to 1963--1979 since the autumn population of spanish mackerel underyear- ing has be exploited by trawl fishery after the end of 1970s and the parameters ofgrowth change as: L_(∞) from 438.00mm to 399 .06mm,W_∞ from 6/5.82g to 512.16g,k from 0.1336 to 0.2307, the growth inflection for body weight from 10.61 to 8.74(a period of 10 days) and the main growth stage for body weight from 7--16 to 6-13 (a period of 10 days) (i. e. from August 11-November 11 to August 11-October11). 4. It is consideration to the characteristics of growth of spanish mackerelOctober 21 for achievement to the rational utilization of its resource.