Growth, production and reproduction of the myctophid fish Benthosema glaciale from western Norway and adjacent seas
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Age, growth, mortality, production and reproduction were studied on material of Benthosema glaciale from some fjords of western Norway and from the adjacent ocean. Samples were collected using pelagic trawls and Icaacs-Kidd midwater trawls. Age was studied by means of otoliths although the seasonal cycle of zone formation was variable. Growth was highly variable within the material, L∞ of the von Bertalanffy's growth equation ranging from 70 to 87 mm and K from 0.19 to 0.46. The instantaneous natural mortality was about 0.7. The maximum sustainable yield per recruit can be obtained with a first age of capture of about 2 years and a fishing mortality of 1.5 or higher. B. glaciale reaches maturity at an age of 2 or 3 years and spawn mainly during summer. The development of the ovaries is briefly described. Its mean fecundity is 700 eggs/female.
SeriesFiskeridirektoratets skrifter, Serie Havundersøkelser
vol 17 no 3