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山塘水库加州鲈的繁殖与养成试验 总被引：1，自引：1，他引：0
４６７ｍ＾２池塘投放加州鲈亲钱８７尾,培育出４￣４．５ｃｍ加州鲈苗种１．７万尾,收入１．０２万元,获利９０００元,并在１９９５￣１９９６年对３６座水库的套养情况进行了调查,结果为平均投入产出比１：１０．９,苗种成活率４６．３％,成鱼平均尾重０．４４ｋｇ,单产１６．２ｋｇ／ｈｍ＾２。 相似文献
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池塘面积６６７ｍＴ＾２放养尾重２００ｇ的大规格条纹鲈鱼种３５８尾，配养７０尾规格３００～４００ｇ的鲢鳙鱼，投喂鲜软颗粒饲料，精养１２０ｄ，条纹鲈产量２３０ｋｇ，成活率１００％，平均尾重６００ｇ，每尾增重４００ｇ，饲料系数２．６，另收获鲢鳙鱼４６ｋｇ。 相似文献
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银鲈原产于澳大利亚穆雷河流域，６０年代初被当地选为商业性养殖性对象。１９９４年３月，上海嘉利特种水产有限公司从悉尼引进１．５－３ｃｍ长的银鲈鱼种５万狡尾，在青浦进行池塘试卷，获得了运输成活率为５０％－９４％的效果。 相似文献
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在主养尼罗罗非鱼淡水池塘中混养鲈，利用鲈捕食罗非仔鱼及野杂鱼，控制池塘栽鱼密度，结果：３个试验池罗非鱼亩净产比对照池分别提高６７ｋｇ，８７ｋｇ和５１ｋｇ，饵料系数比对照池分别降低０．２，０．２５和０．０７，放养尾重２５～５０ｇ的２龄鲈种较为适宜，试验证实了鲈与罗非鱼在淡水鱼塘中混养的可行性及生态学上的意义。 相似文献
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１９９６年６月分两次由海南引进淡水白鲳鱼苗共４万尾，入池三天后计数存活率由４０－６５％，采用网箱单养，池塘单养，池塘混养三种方式进行试养，当年个体规模达尾重１１５－３５０克，网箱单产２３．３ｋｇ／ｍ＾３池塘单养单产８７６．３１ｋｇ／亩。利用塑料大棚简易温室和电厂温排水室外越冬均取得成功，存活率高达９０％以上。 相似文献
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用奥利亚罗非鱼♂和尼罗罗非鱼早杂交经处理后获得的子一代全雄性罗非鱼，在廉江老鸭塘养殖场进行越冬和生长试验，取得较好的效果。1992年11月17日放苗入塘自然越冬，规格1．5—3cm，越冬期间，最低气温5℃，最低水温6．5℃，无任何越冬设施，在周围池塘的越冬罗非鱼大批死亡的情况下，该鱼成活率为99．6％；在以鸭粪肥水进行成鱼试养过程中，经80天养殖，平均水温23．5℃，鱼体重由193．0克／尾增至705克／尾，平均尾日增重6．4克。 相似文献
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茌平县地处黄河故道,盐碱池塘众多。2006年自省淡水水产研究所引进了条纹鲈进行池塘套养,自然越冬,2007年喜获丰收。试验池塘3 333m~2(5亩),平均每667 m~2产鲈118kg,个体最大1.2 kg。现将我们的操 相似文献
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Development of a feeding strategy for silver perch, Bidyanus bidyanus (Mitchell), based on restricted rations 总被引：1，自引：0，他引：1
Stuart J Rowland Geoff L Allan Charlie Mifsud Mark Nixon Peter Boyd & David Glendenning 《Aquaculture Research》2005,36(14):1429-1441
To develop a feeding strategy for the Australian freshwater fish silver perch (Bidyanus bidyanus Mitchell), a series of eight experiments was done in 1 m3 cages in an aerated, earthen pond to determine the effects of feeding rate (% body weight) and feeding frequency (no. of feeds day?1) on the growth and feed conversion ratio (FCR) of fingerlings and larger fish under ambient water temperatures over the range 13.8–30.6°C. Fish were fed extruded pellets of a silver perch diet containing 34% digestible protein and 14 MJ kg?1 digestible energy. Commercial silver perch farmers were consulted about feeding practices for large fish (>500 g) and at water temperatures below 12°C, and winter feeding practices for other warmwater species were used to complete the strategy. In the feeding experiments, growth and FCR increased with increasing feeding rates to a level above which only FCR increased. Optimal feeding rates and frequencies were those which resulted in maximal growth, while minimizing effort (feeding frequency) and FCR. The highest feeding frequency required for maximal growth, including that of small fingerlings was twice (2 ×) daily, and the optimal feeding rates varied with water temperature and size of fish. The optimal daily regimes were: small fingerlings (initial mean weight, 2.0 g) 7.5% 2 × at a mean temperature of 23.3°C; fingerlings (14.9–27.7 g) 7.5% 2 × at 27.1°C, 5.0% 2 × at 23.7°C and 2.0% 1 × at 16.8°C; and large silver perch (162.5–510.6 g) 0.5% 1 × daily or 1.0% on alternate days at 15.6°C, 1.0% 1 × at 17.3°C, 3.0% 2 × at 24.1°C and 2.0% 2 × at 27.9°C. It is suggested that regimes of 0.5% 1 × daily for fingerlings (<50 g) and 0.5% 1 × on alternate days for larger fish are used at temperatures of 9–12°C, and 0.5% 3 days week?1 and 0.5% 1 day week?1 for fingerlings and larger fish, respectively, at 6–9°C. Feed inputs should not exceed 150 kg ha?1 day?1 in ponds less than 0.3 ha and 100 kg ha?1 day?1 in larger ponds. Our research has established a feeding strategy for silver perch based on restricted rations. 相似文献
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Abstract. Salmonid fish at fish farms in northern and central Finland and perch, Perca fluviatilis L., roach, Rutilus rutilus (L.), and whitefish, Coregonus sp., from four lakes in central Finland were studied between 1985 and 1990 for the occurrence of Yersinia ruckeri. The bacteria were found in fish from both areas, but in most cases, only single diseased salmon, Salmo salar L., brown trout, S. trutta L., rainbow trout, Oncorhynchus mykiss (Walbaum), whitefish and perch were encountered and were always connected with stress conditions. One clinical outbreak occured in salmon fingerlings in northern Finland, and the fish were successfully treated with trimethoprim-sulpha. Monthly monitoring of lake fish revealed two symptomless carrier perch in two lakes. Outwith the main study a moribund perch with yersiniosis was found in a polluted lake, and for the first time in Finland, a rainbow trout was also found to have contracted yersiniosis in a small private pond. Sorbitol-positive and negative isolates have been found to occur in both moribund and carrier farmed fish, indicating that the sorbitol test is not essential when evaluating the pathogenicity of Y. ruckeri. 相似文献
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David A Foley Stuart J Rowland Geoffrey Glenn Wilson Paul Winters Mark Nixon Charlie Mifsud 《Aquaculture Research》2010,41(11):1574-1581
Slow growth and losses to bird predation and infectious diseases in winter can compromise the profitability of silver perch farming. To evaluate over‐wintering silver perch (Bidyanus bidyanus) in a recirculating aquaculture system (RAS), fingerlings (38 g) were stocked in either cages in a pond at ambient temperatures (10–21 °C) or tanks in the RAS at elevated temperatures (19–25 °C) and cultured for 125 days. Mean survival (96%), final weight (146 g), specific growth rate (1.07% day?1) and production rate (28.1 kg m?3) of fish in the RAS were significantly higher than for fish over‐wintered in cages (77%, 73 g, 0.53% day?1, 11.1 kg m?3). Fish from both treatments were then reared in cages for a further 129 days. Final mean weight of fish originally over‐wintered in the RAS was 426 g, while fish over‐wintered in cages were only 273 g. To determine optimal stocking densities, fingerlings (11.8 g) were stocked at 500, 1000 or 1500 fish m?3 in tanks in the RAS and cultured for 124 days. Survival was not affected, but growth was significantly slower and feed conversion ratio higher at 1500 fish m?3 compared with 500 or 1000 fish m?3. Results demonstrate that over‐wintering silver perch in an RAS can produce large fingerlings for grow‐out in early spring. This strategy could eliminate bird predation, reduce losses to diseases and shorten the overall culture period. 相似文献
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Advanced walleye (Sander vitreus) and yellow perch (Perca flavescens) fingerlings are produced by habituating pond-reared fingerlings to commercial feed. Success of the habituation phase depends on many variables. Among these, diet contrast/visibility is an important variable for habituation success. The objective of this study was to compare the effect of turbid water (≥100 nephelometric turbidity unit, NTU) and clear water culture conditions during the habituation phase for these two species. In 2005, 12 150 L black-cuboidal tanks with in-tank lighting were stocked at a rate of 2 g/L age 0 of either walleye or yellow perch fingerlings with half of the tanks receiving turbidity (clay slurry) and cultured for 28 d. All fish were fed a commercial diet every 5 min during a 16 h daylight interval at 10%?body weight/d. Walleye in the clear treatment had higher survival (83?±?2.0%) than the turbid treatment (57?±?6.0%). The yellow perch exhibited opposite survival results: turbid treatment rates at 79?±?2.1%?and clear treatment rates at 54?±?9.2%. These results demonstrate that the addition of clay may enhance the contrast of the feed and thus improve the habituation phase for yellow perch. 相似文献
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鲈与中国对虾混养试验 总被引：1，自引：0，他引：1
１９９５、１９９６年进行鲈与中国对虾混养试验，利用鲈摄食病虾及小型糠虾类，阻断病毒传播，推迟了对虾发病，试验池产量，效益成活率均高于对照池。 相似文献
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利用土池进行双棘黄姑鱼高密度苗种培育试验,孵后第4d的开口仔鱼直接入池,经42d的培育,共收成鱼种62．3万尾,体长4．6cm-5．8cm,平均体长5．2cm．。平均亩产47196尾,成活率51．91％。试验结果总产值16．1万元,扣除直接生产成本后,利润13．8万元,平均亩利润10454元,获得了较好的经济效益。 相似文献
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Abstract The effects of perch, Perca fluviatilis L., and bronze bream, Abramis brama (L.), predation on the production of insects emerging at the water surface and the autumn biomass of benthic macro-invertebrates were assessed in a series of experimental ponds. The study attempted to discover whether fish affect food availability for diving and dabbling ducks in freshwater habitats. Ten ponds (bisected by fine netting) were used for the study: one was left totally fish-free, whilst one half of each of three groups of three ponds was stocked with either perch, bream or perch plus bream. The relative abundance of emerging insects (mainly Chironomidae) was significantly reduced in two perch ponds, two perch + bream ponds and two bream ponds. The autumn standing crops of benthic macroinvertebrates were significantly reduced in one perch pond, three bream ponds and one perch plus bream pond. These results support findings of a contemporaneous large bio-manipulation experiment carried out in two adjacent lakes. During the biomanipulation studies, aquatic invertebrate standing stocks greatly increased after the removal of fish and decreased following restocking. 相似文献
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S. Yong-Sulem E.T. Tomedi S. Mounchili S. Tekeng R.E. Brummett 《Aquaculture (Amsterdam, Netherlands)》2006,260(1-4):139-144
To inform decisions on improving the yields of African catfish Clarias gariepinus fingerlings in earthen ponds, the hypothesis that composts and leaks were partly responsible for usually low and variable fry survivals was tested, through comparison of treatments and simple regression. The occurrence of amphibians was significantly higher (P < 0.05) and survival of fry was significantly lower (P < 0.02) in ponds with composts than in those without. The survival of fry and fingerlings in earthen ponds was negatively correlated with their night leaking rates and regression analysis yielded the equations y = − 13.31x + 82.56 for fry and y = − 6.97x + 95.29 for fingerlings, where y is the survival of fry or fingerlings in a holding pond and x is the leaking rate of the pond. Realizing how negatively the existence of composts and leaks could affect the survival of fry and fingerlings, fertilizing unfenced ponds with composts and sterilizing nursery ponds by drying were proscribed. 相似文献