播磨灘北東部におけるマアナゴ稚魚の成長と食性

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  • Growth and Stomach Contents of Juvenile White-spotted Conger Conger myriaster

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The growth and stomach contents of juvenile white-spotted conger Conger myriaster were studied in northeast Harima Nada, Seto Inland Sea, Japan. Leptocephalus larvae of the fish were collected from March to May in 2001 and juvenile fish were collected from April to September in 2001 and from May to August in 2003. Survey areas were 10-20 m depth and bottom sediment type was medium-fine sand and gravel. Mean total length of the juvenile fish changed from 80 mm in May to 190 mm in September. It is considered that leptocephalus larvae settled mostly in May, and the fish recruit to the fishery in the same year. As crustaceans and polychaetes were the main components in the stomach contents (accounting for 60-100%in terms of the numerical composition), we concluded that these are important feeding organisms for juvenile white-spotted conger. In the small length classes, crustaceans were the main food item. For larger length classes, there was a shift to polychaetes as the main food source. When the crustaceans were classified into lower taxa, the stomach contents shifted from amphipods to decapods with growth. In terms of the wet weight composition, this shift was observed at the total length of 130 mm.

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  • 水産増殖

    水産増殖 52 (2), 139-144, 2004

    日本水産増殖学会

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