Abstract
REPORTS1,2 that live larvae of the nematode Anisakis from raw or inadequately cooked fish may cause eosinophilic granuloma of the alimentary tract in man have stimulated research into the ecology, taxonomy, physiology and pathogenesis of this genus in fish (natural second intermediate hosts), marine mammals (natural final hosts) and man and laboratory animals (abnormal hosts)3,4. But little attention has been paid to earlier stages in the life cycle or to a search for first intermediate hosts, A knowledge of early developmental stages of Anisakis might contribute to an understanding of geographical and other variations in abundance of the larvae in economically important fish. Uspenskaya5 reported larval Anisakis in one of 855 specimens of the amphipod Caprella septentrionalis Kroyer, 1838, in one of 990 specimens of the decapod Hyasaraneus (L.) and in one of an unspecified number of euphausiids Thysanoessa raschii (M. Sars, 1864) from the Barents Sea. Oshima et al.6 found five larvae in 3,247 specimens of T. raschii and T. longipes Brandt, 1851, collected in the northern North Pacific Ocean and Bering Sea. Kagei7, according to Gibson4, mentioned T. inermis (Kroyer, 1846) as a first intermediate host of Anisakis.
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