Description of the spawning and the early life history of haddock (Melanogrammus aeglefinus L.) from the Norwegian Skagerrak coast. In: Flødevigen rapportserie no 1, 1987
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Matured haddock were caught in late January 1982 and 1983 and transferred to a spawning basin. Spawning took place within 90 days from late February to late May each year, with a maximum from the middle of March to the middle of April. In the two years the average number of eggs spawned by each female were 520.000 and 568.000 respectively. Egg diameter decreased during the spawning period, from a daily average of 1.50 to 1.29 mm, with an average of 1.38 and 1.39 mm in the two years. Fertilization rate was usually above 80% and the total mortality during the incubation period varied between 30 and 70%. Increasing temperature from 5.5 to 7.0 degrees C decreased the incubation period from 17 to 12 days. There was a positive correlation between egg size and larval length at hatching. At temperatures between 5 and 9 degrees C the peak starvation mortality occurred at larval ages of 22 - 17 days. The larvae lost about 25% of their dry weight during this period . The larvae started to feed at an age of 3 - 5 days and the dominant food organism was copepod nauplii in the size range 90 to 400 mm.