高产技术及当年养成商品鱼培育罗非鱼苗利用塑料大棚早春在东北地区放养当年繁育的罗非鱼苗种，下塘时间晚，生长期短，商品率低；如放养春片鱼种，则受越冬条件限制，致使种源奇缺，价格昂贵，严重影响经济效益。为此，辽宁省大洼县城郊渔场自１９９２年开始，在每年三月... High-yielding technology and the year to develop commodity fish breeding tilapia fry plastic sheds in early spring in the northeast region stocked breeding tilapia seedlings, Xiatang late, short growth period, commodity rate is low; such as stocking spring fish, then by Winter conditions, resulting in a scarcity of provenances, expensive, seriously affecting economic benefits. To this end, Dawa County, Liaoning Province suburban fishing grounds since 1992, in March of each year ...