Gametogenic cycle of Mesodesma donacium in Mehuin beach, Valdivia, Chile, Jul...

Gonad stage: Percentage (from a montly sample of 30 clams) of male and female clams classified into four gonad stages: inmature, mature, late maturity, spawned, regression....性腺分期（Gonad stage）：以30只蛤蜊的月度采样为样本计算得到的百分比数据，统计被划分为未成熟、成熟、晚熟、产卵后、退化等性腺分期的雄性与雌性蛤蜊的占比情况。