東シナ海におけるドクサバフグの分布と生態

概要

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Over 500 samples of the toxic swellfish Lagocephalus lunaris (BLOCH et SCHNEIDER) were taken with pair trawlers and large-and medium-sized purse seiners in the shallower waters less than 200m depth south of 32°N in the East China Sea in 1980-1985. Examination of the gonads indicated that the spawning season was in the early summer in the southern and continental side of the Sea and the spawning fish were more than two years old. The fish reached about 18cm BL at the end of the year, about 25cm in one year and about 30cm BL in two years from their birth based on their size frequencies. Swellfish less than 20cm BL formed more than 90% of the total catch with the pair trawlers and concentrated in the central area of the Sea between Octo-ber and December in 1983. The swellfisb were inferred not to be schooling in the fishlng ground. The catch with pair trawlers varied from year to year; the prominent occurrence, which was less than 1 ton, was in April 1983-March 1984. The location of capture of the sewllfish L. lunaris differed mazkedly from the fishing ground of the swellfish L. gloveri which is the main catchable stock of the genus Lagocephalus in the Sea.