文章摘要
张列士,杜久香.网箱养鱼高产试验及其技术因子的探讨[J].水产学报,1984,8(1):19~32
网箱养鱼高产试验及其技术因子的探讨
HIGH YIELD OF FISHCULTURE IN CAGE AND ITS TECHNOLOGICAL FACTORS
  修订日期:1992-06-01
DOI:
中文关键词: 琼胶  江蓠  藻类加工
英文关键词: 
基金项目:
作者单位
张列士 上海市水产研究所 
杜久香 上海市水产研究所 
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中文摘要:
      本文报导了网箱养殖莫桑比克罗非鱼(Tilapia mossambica)和草鱼(Ctenopharyngodonidellus)高产试验。其中网养莫桑比克罗非鱼获得每平方米净产97公斤,饲料系数为2.16;网养草鱼每平方米净产14.5 公斤,饲料系数为2.49。此外,本文论述了网箱结构,饲养环境,养殖方式,饲料配方,投喂技术等技木因子对提高单位产量的关系。作者认为合理选择网箱,敷设饲料台,控制溶氧不低于 3mg/L、水温不低于 15℃,饲养密度为 5-10公斤/米~2,单养,采用蛋白质组分不低于35%的颗粒饲料以及提供 10%—2%的日给食率,是网养给食式鱼类获得高产并降低饲料系数的关键。
英文摘要:
      Since 1976, a series of net-cage--culture experiments of tilapia and grass carpwere carried out in Dianshan Hu Lake, Qingpu County, Shanghai, in order to verifythe appropriate technology.In 1976, a high yield of 306 kg/36M2(8. 5kg/M2) in 135 days was obtained, butthe conversion rate of feed was very low. Therefore, another experiment in culturingtilapa was carried out in 1977. The aim of this experiment was to find out the appro-priate technique of cage culture suitable to our country. Nine 2×2×2.5 M cages wereinstalled in the Dianshan Hu Lake for the experiment. After 80 days rearing, theyields obtained ranging from 10.6 kg/M2 to 35.15 kg/M2. The rate of conversionrange from 2.7 to 5.2.The size of the net cage was 2×2×2.5M, and the stocking density was 4,200individuals/M2, the average weight of the fingerling was 1.68g. Feeding with drypellet composed of 10% fish meal, 40% fine rice bran and 50% soybean cake, at afeeding rate of 12.2% to 2.4% fish biomasa per day. After 120 days 388 kg was harvested. The rate of conversion was 2.16, In 1980, the same procedure applied torear grass carp in cage, and an average yield of 25.09 kg/M2 (net yield of 14.5 kg/M2) obtained. The Conversion rate was 2.49. The economic value of grass carp ismuch higher than tilapia.The key factors to obtain high yield can be concluded as follows: (1) The cageshould be of medium--sized (20 to 60 M2). A feeding stage is necessary to set inside thecage in order to save the waste of the feed. (2) The optimum stocking density rangesfrom 5 to 10kg/M2. Mono-culture of a high valued fish is preferable. (3) The diss-olved oxygen should not be less than 3 mg/L. (4) Nutritive feed with a total protiencontent over 35% should be available. (5) According to the difference of sizes, thefeeding rate ranges from 10% to 2% of fish biomass per day. (6) Effective controlof pest and fish diseases.
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