ニュ-ジ-ランド周辺海域におけるホキの成熟と産卵〔英文〕

概要

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The spawning season of hoki in the EAST, the NORTHWEST and the SOUTH regions are estimated to be July-September, June-September and July-September respectively. The biological minimum size of females seems to be larger than that of males, and the biological minimum size of the NORTHWEST or the SOUTH region seems to be larger than that of the EAST region. There are more females when the total length is over 62cm in the EAST region, and over 92cm in the NORTHWEST or the SOUTH region. This may be due to the longer life span of the females. The spawning grounds are estimated to be the southwetern area of Mernoo Bank and Chatham Rise in the EAST region, the western offshore of South Island in the NORTHWEST region, the southeastern offshore of South Island and Puysegur Bank in the SOUTH region. The depth of spawning is assumed to be 400-700m, 325-826m and 300-500m in the EAST, the NORTHWEST and the SOUTH region respectively.
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