Spawning Stock, Population Fecundity and Year-class Strength of Greenland Halibut (Reinhardtius hippoglossoides,) in the Northwest Atlantic, 1969-88

摘要

An attempt was made to analyse spawning stock abundance and population fecundity of Greenland halibut (Reinhardtius hippoglossoides) against the background of fluctuations in year-class strength. Population fecundity varied from 8 x 1011 to 24 x 1011 eggs in 1969-88. Survival indices of year-classes 1969-88 were calculated during early life history and a five-fold difference between maximum and minimum survival rates was revealed. An inverse correlation was found between survival rate and water temperature at 50-200 m depth on the hydrographic section across the Hamilton Bank. This was used for survival index projections