ヒメジャコの性成熟と漁獲禁止殻長
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概要
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Boring clam, one of the giant clams is resource which has decreased markedly. For main-tenance of this resource Okinawa Prefecture has established harvesting regulations. Data on the boring clams, such as relation between shell length and wet weight of soft part or gonad, and sexual differentiations are summarized. Young shells less than 5.5cm in shell length are male, and larger ones are hermaphroditic. Wet weight of matured gonad in clams of 6cm shell length are only 3g, but attain 10.6g in 8cm clams. Wet weights of edible portion are 11.3g and 25.3g for 6 and 8cm clams respectively. The prohibition of harvesting clams under 8cm in shell length is based on the calculation of the number of reproductive years necessary to maintain and restore the population. The short diameter of the adductor muscle (1.4cm) may be substituted for shell length when the shell has been removed.
- 日本水産學會の論文
著者
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- ヒメジャコの性成熟と漁獲禁止殻長