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河养殖要取得较好的经济效益，必须设法在当年养殖周期内达到最佳的商品规格，市场上最佳商品规格是500～650克，成品河规格越大，市场售价越高。选择适当规格的鱼种，在不影响河生长的前提下尽量降低养殖成本，赢得更佳的经济效益。现阶段长江口河养殖，一般选用50克
To obtain better economic benefits, we must try our best to achieve the best product specifications during the breeding season. The best product specifications in the market range from 500 to 650 grams. The larger the product specifications, the higher the market price. Select the appropriate species of fish species, without affecting the growth of the river under the premise of minimizing farming costs, to win better economic benefits. At this stage the Yangtze River estuary breed, the general selection of 50 grams