Estimating the spawning stocks of Pacific hake (Merluccius productus) and walleye pollock (Theragra chalcogramma) in the Strait of Georgia, B.C. from their released egg production / by J.C. Mason, A.C....: Fs97-6/1289E-PDF

"Ichthyoplankton surveys were carried out in the Strait of Georgia, B.C. during their common spawning season (Feb.-June) for endemic stocks of Pacific hake and walleye pollock, in 1981. The objective was to estimate the magnitude of the spawning stocks in the central and southern regions of the strait by the egg production method. A grid of 80 stations was sampled using Bongo gear every two weeks on nine cruises from late February to mid-June. Annual released egg production amounted to 1.84 x 10¹³ pollock eggs and 3.78 x 10¹³ hake eggs. Magnitude of spawning in northern Georgia Strait south of Campbell River is estimated at <5% and <15% of that for pollock and hake, respectively, in the central and southern strait. From associated fecundity and population parameters of sex ratio, and mean length and weight, the adult stocks are estimated to comprise 96.2 million pollock (60.5 kt) and 390 million hake (182.6 kt) in the strait south of Texada Island"--Abstract, page iii.

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