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1.根据扇贝性腺周年变化和性腺发育来看,天津地区扇贝从5月下旬开始是产卵期,一直延续到8月底至9月初,盛期是5月末-6月初,7-8月份又是一次高峰。2.采捕日期:根据周年性腺变化,9月6日以后,扇贝性腺量大大减轻,9月20-10月20日可订为扇贝采捕期。3.确定性腺成熟指标:当性腺成熟系数达12％以上,则为性成熟指标。4.生长速度:当年生幼贝,长到1.5公分。5.敌害问题:生物敌害系多方面所造成,今年仅作了一次海螺敌害试验,海螺对扇贝的严重危害是显而易见的。
1. According to the scallop gonads and gonadal changes in the annual changes in perspective, Tianjin scallops from late May to spawning period, until the end of August to early September, the peak period is from late May to early June, 7-8 months is A peak. 2. Acquisition date: According to the annual gland changes, September 6, scallop gonadal mass greatly reduced, September 20 - October 20 scallop harvesting period can be set. 3. Determine the gonadal maturity index: When the gonadal maturity coefficient of 12% or more, then the index of sexual maturity. 4. Growth rate: annual pups, grow to 1.5 cm. 5. Adversity problem: biological adversity caused by many aspects, this year only made a Conch Adverse Test, conch on the scallop serious harm is obvious.