对虾亲体数量和补充量之间的关系

本文用世代渔获量和春汛产量作为补充量和亲体数量的相对数倍,研究对虾(Penaeusorientalis)亲体数量——补充量之间的关系。用Boverton或Ricker繁殖模式描述两者之间的关系。经数学分析,表明本命题似乎用Beverton模式更为适合。 根据计算最大补充量所需的亲体数(A_(max))、最大补充量(R_(max))和最大持续产量(M_(zy)),以及渔业上记录到的最大补充量和相应的亲体数量。确认现在的产卵亲虾数量太少。如果把产卵亲虾的相对数值112调节到250～300,则世代产量可望增加50～70%,即从1700增加到2500～3000;如果各种条件都充分满足,对虾世代的极限值约为4000。

A STUDY ON THE RELATION BETWEEN ADULT STOCK AND RECRUITMENT OF THE PRAWN (PENAEUS ORIENT ALIS KISH.) FROM BO HAI

The catches of the year-class and the mature spawners of the prawn (Penaeusorientalis) in spring are used as indices of the recruitment and the adult stock, and therelation between them is here discussed. It is considered that their relationship can bedescribed with Beverton or Ricker reproductive models in the range of the spawnersrecorded. The values of the parameters in Beverton's and Ricker's models area = 2.092×10^-4 b = 4. 187×10^-2 (r= 0 .60, p0.05) and a= 24.43 b = 3. 565×10^-3(r= 0.58, p0.05) respectively. By the use of mathematical analysis, it seems thatBeverton's models is more suitable to deseribe thier relationship than that of Ricker's. According to the values of the A_max (number of mature spawners needed for themaximum recruilment), R_(max) (maximum recruitment) Msy (maximum sustamableyicld) and the sizes of the maximum recruitment and adult stock recorded by the prawnfishery, it is certain that the number of the mature spawners is too scarce, If the valueof the mature spawners is adjusted to be 250--300 from being 112 (the average valueof 16--year classes) the yield of year-class will be increased approximately 50--70% andthe value will be increased from 1700 (the average value of 16--year-classes) to 2500-3000. The maximum yicld of year-class would attain to 4000, if the conditions shouldbe satisfied.