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Distribution, sexual maturity, spawning dates and temperature preferences of Georges Bank haddock (Melanogrammus aeglefinus L.) were investigated with data collected on spring bottom-trawl surveys in 1977-83. The results agree with earlier work that peak spawning occurs during late March or early April and that preferred bottom temperatures ranged from 4° to 7° C. The Northeast peak of Georges Bank appeared to be the most important spawning area, but the area to the east of the Great South Channel in depths less than 100 m was also important during some years. Length at 50% maturity averaged 37 cm for males and 40cm forfemales, and a response to large incoming year-classes was noted. The stock was composed of about 37% mature individuals at age 2 and 90% at age 3, butthese percentages varied by sex and year. Sex ratios averaged 1.33: 1 in favor of females during the period and were skewed in favor of females in every year.

Factors Relating to the Reproductive Biology of Georges Bank Haddock (Melanogrammus aeglefinus) in 1977-83