The biological basis consists of: (1) the development of oocytes in the ovary of the brood fish is not completely synchronous.

草鱼一年多次产卵的生物学基础主要是：(1)成熟草鱼卵母细胞发育的不完全同步性。

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Egg weight and egg diameters are mainly influenced by maturing factor, and are not correlated to biological indexes of brood fish.

卵重、卵径主要受成熟系数的影响，与母体生物学指标关系不密切。

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This paper studied the techniques of pond domestication and artificial propagation of brood fish of Erythroculter ilishaeformis and the cultivating of its summer fingerlings.

对翘嘴红鱼白亲鱼的池塘驯化培育和人工繁殖技术以及夏花鱼种的培育技术进行了研究。

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The problem is that the fish that formed the base of the hatchery brood stock used to replenish salmon in Maine's rivers came from the Penobscot River until 1992, when state officials began a river-specific stocking program that placed descendents only in rivers their stock came from.

CNN: Gene study seeks 'wildness' of Atlantic salmon - October 25 1999