살조개, Protothaca jedoensis의 성성숙과 성비

• 영문명: Sexual Maturation and the Sex Ratio of the Jedo Venus, Protothaca jedoensis (Bivalvia: Veneridae)
• 발행기관: 군산대학교 수산과학연구소
• 저자명: 김지현(Ji Hyun Kim) 정의영(Ee-Yung Chung) 김용호(Yong-Ho Kim)
• 간행물 정보: 『군산대학교 수산과학연구소 연구논문집』제5집, 373~381쪽, 전체 9쪽
• 주제분류: 농수해양 > 수산학
• 파일형태: PDF
• 발행일자: 2004.07.03

영문 초록

The gonad index (GI). reproductive cycle with gonad developmental phases, first sexual maturity and the sex ratio of the jedo venus, Protothaca jedensis, on the coastal waters of Boryeong, Korea were investigated by histological study. Samples were collected from the subtidal zone of Boryeong, Korea from January to December, 1999. Monthly changes in the gonad index in female and male clams gradually increased from February and reached the maximum in May, and then the values rapidly decreased from June and reached the minimum in November as seen in variations of the reproductive cycle. The spawning period of this species was once a year between May and July, there was a spawning peak between June and July when seawater temperature was over 20'C. The reproductive cycle of this species in female and male clams can be classified into five successive stages: early active stage (December to March). late active stage (February to June), ripe stage (April to July), partially spawned stage (May to July) and spent/inactive stage (July to January). Percentages of first sexual maturity of female and male clams of 30.1-35.0 mm in shell length were 52.6% and 60.0%, respectively, and 100% for the clams over 45.1 mm in shell length. The sex ratio of individuals> 30.1 mm in shell length was 1:1 (x2 = 0.40. p>0.05).

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