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| 本文研究探讨了石岛渔场流刺网渔获的鲐鱼生殖群体的个体生殖力,得纠结果:1.计数样品范围内鲐鱼个体绝对生殖力平均值为531600粒;2.鲐鱼个体相对生殖力R/L平均值为1539粒/mm,R/w平均值为1078粒/g;3.雄鱼性成熟早于雌鱼,雌鱼寿命高于雄鱼;4.用复相关关系的拟合方程关系式求得的个体绝对生殖力的理论数值与实测值的相对误差仅为0.1。 |
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| A STUDY ON THE INDIVIDUAL FECUNDITY OF MACKERAL, PNEUMATOPHORUS JAPONICUS HOUTTUYN |
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| Abstract: |
| The present paper deals with the fecundity of mackeral, pneumatophorus japonicus. 240 ovary samples were taken from northern Yellow Sea in June 1984 and May 1985. 1. The individual absolute fecundity increases exponentially with its net weight, fork length andage, ranging from 195.4 to 900.4(×1000), averaging 531.6 (×1000). 2. The relative fecundity (R/L and R/W) ranges from 692 to 2094, and 729 to 1360 averaging 1539 for R/L and 1078 for R/W. As the net weight or the fork length increases the R/L increases, but there is no obvious change neither in R/L, nor in R/W. 3. Male fish matures earlier than female fish, but the female fish enjoys a longer life than male fish. 4. Synthetic relationship between fecundity and net weight, fork length and age is in agreement with that obtained with single factor. The number of egg is caculated by the formula obtained, with an absolute error of 10000 and a relative error of only 0.1. |
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