The biology of Jaera spp. (Crustacea, Isopoda) in the northwestern Atlantic. 1. Jaera ischiosetosa

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Abstract
Oogonia of female Jaera ischiosetosa begin to enlarge in April and the first hatched young appear in June. Reproduction continues until August. From September to March the females lack oostegites and are in a resting stage. Females do not produce continuous broods during the season, but lose their oostegites after every brood. Individuals survive for 1 year at the most. In August the population consists almost entirely of young of the year, some of which may breed in the same year. Egg size is small and the fecundity relatively high.

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