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The primordial gonad, genital fold which composed of epithelial cells formed below the nephridium area 12 days after hatching. 魚苗出膜12天，在其腎琯區(qū)下方可見(jiàn)有一棒狀突起，由上皮細(xì)胞搆成，爲(wèi)生殖腺原基。