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经过二年来重复试验,在辽南地区养殖周期短,水温低,鱼池连片面积较大的条件下,取得平均亩净产商品鱼252.7公斤,亩净赢利290元,饵料系数为1.37的成果。初步摸清了海水养殖罗非鱼的主要技术关键是:① 提高鱼种海水驯化的成活率;② 早放苗、放大苗、力求苗种品系纯正,充分发挥纯尼罗罗非鱼的生长优势;③ 鱼种下塘前及养成期间都要培育出良好的水质,其中溶解氧保持在3mg/ι以上,pH=7.5～8.6,氨态氮不高于O.027mg/ι,透明度控制在35～20cm,浮游植物总生物量保持在50～100mg/ι;④ 在饲养方法上,采用施肥与投饵相结合;⑤ 对溃烂病、鱼虱病、甲藻导致的赤潮提供了有效的防治方法。 本文是二年试验工作总结,着重阐述了大规格鱼种养成商品鱼的高产,稳产的技术关键和有关的一些理论问题的以及不同放养规格、放养密度与池塘产量、出池规格和商品率的关系。
After two years of repeated experiments, the average aquaculture production of 252.7 kg net fish, net profit of 290 yuan per mu and feed conversion coefficient of 1.37 was achieved under the condition of short breeding cycle, low water temperature and large contiguous fish pond area in southern Liaoning. Preliminary found that the main technical mariculture tilapia key are: ① improve the survival rate of seawater domestication of fish species; ② early seedling, enlarge the seedlings, and strive to pure strains of seedlings, give full play to the growth advantages of pure nile tilapia ; ③ fish ponds before and during the cultivation should cultivate good water quality, dissolved oxygen maintained at 3mg / ι above, pH = 7.5 ~ 8.6, ammonia nitrogen is not higher than O.027mg / ι, transparency is controlled at 35 ~ 20cm, the total biomass of phytoplankton maintained at 50 ~ 100mg / ι; ④ in feeding methods, the combination of fertilization and feeding; ⑤ on the fester disease, louse disease, dinoflagellate red tide caused by the effective prevention and treatment method. This article is a summary of two years of experimental work, focusing on the large-scale species of fish to develop high-yield, stable production of the key technical and related theoretical issues and stocking specifications, stocking density and pond production, the pool size and product rate Relationship.