On the Shrimp Resources of the Bering Sea

Abstract

Following four species, namely, Pandalus hypsinotus BRANDT, P. borealis KROYER, P. goniurus STIMPSON, Pandalopsis dispar RATHBUN, are found as shrimp resources of the Bering Sea. In P. borealis, the most important shrimp resources in the sea in question, the body-length, from postorbital margin to tip of telson, ranges 72.0〜120.0 mm in female, 41.5〜98.0 mm in male. It seems that the sexual change of this shrimp takes place in body-length from 70 mm to 100 mm. Spawned shrimps, pre-eyed egg, eyed egg-arrying ones and those having ovarian eggs occur during the period from posterior half of April to September. Egg diameter is measured 1.02×0.78 mm in pre-eyed eggs, 1.43-0.96 mm in eyed eggs. Number of eggs laid beneath abdomen has a positive relation with body-length. It is 425-2045 (1207 on average) in eyed-egg, 724-2606 (1776 on average) in pre eyed one.