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北方池塘驯化养鲤高效技术措施 总被引：1，自引：0，他引：1
2015年,黑龙江省肇源县肇源镇兴安村陈功林,采取池塘驯养鲤鱼,取得较高的经济效益.他池塘驯化主养鲤鱼面积280亩,其中鱼种50亩、成鱼230亩,以80∶20放养模式为主.鱼种池共放养鲤鱼夏花鱼种20万尾,鲢、鳙、草鱼夏花鱼种6万尾;共投喂鲤鱼苗种饲料43吨;共产鲤鱼秋片鱼种3.1万kg,鲢、鳙、草鱼秋片鱼种0.75万kg.成鱼池放养鲤鱼春片鱼种2.9万kg、规格2.5 ～ 3.5kg/尾,鳙鱼春片鱼种2850尾、规格1～ 1.5kg/尾,鲢鱼种9000尾;共投饲料60吨;共产鲤成鱼17.5万kg、平均规格为5.5kg/尾,其中鳙鱼1.54万kg、鲢鱼2.9万kg.总投资230万元,总收入275万元,总盈利45万元,平均亩盈利1607元.以下介绍其主要技术措施. 相似文献
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2004～2005年进行了翘嘴红鲌人工繁殖、夏花与冬片鱼种培育、成鱼池塘与网箱养殖试验,取得较好效果。2004年：催产亲鱼25组,出苗340万尾；3口发花池经25天饲养共产夏花鱼种24.91万尾,平均体长3.0～3.3 cm；3口育种池经140天培育共产冬片鱼种6.38万尾,平均体长12.4～14.3 cm,利润2660～2937元/667m~2,投产比1：2.64～2.82。2005年：3口成鱼池共产商品鱼7445 kg,平均单产413.6 kg/667m~2,利润4546～6333元/667m~2,投产比1：2.15～2.53；4口网箱共产商品鱼2558kg,平均单产32.0 kg/m~2,利润352～413元/m~2,投产比1：2.01～1：2.03。 相似文献
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总结了"一年两茬"池塘鲤鱼养殖技术要点。在郑州市沿黄地区池塘进行一年两茬养殖试验,第一茬养殖商品鱼,4月中旬至5月初放养规格200~300g/尾的大规格春片鱼种,7月初商品鱼出池上市;第二茬培育鱼种,成鱼出池后放养夏花鱼种,进入第二茬鱼养殖。通过采取梯次投放鱼种、科学投饲,适时调控水质和综合防治鱼病等,实现池塘顺次养殖,商品鱼错峰上市,对养殖户具有一定的借鉴意义。 相似文献
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1988年,任丘市鱼种场采用综合科学养鱼技术,在面积为13亩、水深1.2～2.2米的旧坑塘中,培育以鲤鱼为主和少量鲢鱼的大规格鱼种,取得成功。当年6月7日投放鲤鱼夏花18.9万尾,尾重0.415克;6月30日投放鲢鱼夏花6.5万尾,尾重0.208克。至10月上旬,总产达1.64万公斤,亩均1262公斤;其中鲤鱼鱼种13612公斤,亩均1047公斤,鲢鱼鱼种2788公斤,亩均215公斤。鲤鱼鱼 相似文献
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大田乡桥头村村民唐明奎利用1亩责任田在种好水稻的同时，开展稻田养鱼。取得了可喜的成绩。1989年5月8日投放夏花鱼种420尾。其中草鱼夏花100尾，鲤鱼夏花320尾，10月23日起水20-24厘米的大规格草鱼种47尾，鲤鱼284尾，重71公斤，鱼产值311元，获纯利281元，两季共收获稻谷920公斤。 相似文献
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江苏省太湖渔业管理委员会,为了充分利用太湖天然饵料资源,增加名贵及特种水产品产量,1990年投资120万元,先后人工放流了青鱼、草鱼、鳊鱼、鲤鱼、鲢鱼一龄春片鱼种556万尾,鲤鱼和鲫鱼夏花鱼种8299万尾,幼蟹2554公斤,蟹苗1389公斤,幼鳖1.4万只,幼鳗17.78万尾,总 相似文献
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全雌鲤是中国科学院水生生物研究所科技人员,结合生产实践培育出的一种由当年鱼苗养成商品鱼的养殖新对象。1989～1991年,通过钟祥县水科所等单位的养殖实践证明,全雌鲤具有比其他鲤鱼生长速度快,养殖周期短,成本低,体型好,丰满度高等优点。在一亩鱼种池或成鱼塘套养50尾夏花全雌鲤鱼种,当年尾重均可达到0.5公斤以上,商品率100%。比对照池每亩放普通鲤鱼夏花50尾,年底只能长到0.2公斤左右的速度快二倍以上。从鱼苗养到0.5公斤的商品鱼,养殖周期也比普通鲤鱼缩短 相似文献
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Liping Li Rui Wang Wanwen Liang Xi Gan Ting Huang Yan Huang Jian Li Yunliang Shi Honglin Luo Ming Chen 《广西水产科技》2014,(1)
Previously, we reported 10 PEGE types of 85 tilapia Streptococcus agalactiae(GBS), which shifted from Streptococcus iniae in China, by using PEGE method. Presently, larger and more representative tilapia GBS were isolated, for the ?rst time in China, to characterize their serotypes and genetic diversities more precisely than had done before. 168 GBS strains were distributed in ?ve provinces of China, in which Guangdong, Guangxi and Hainan were the major ones, holding36.9%(62/168), 37.5%(63/168) and 19.6%(33/168), respectively. Serotypes, Ia, Ib and III, were observed in these strains and the most predominant one was Ia(95.2%), which mainly distributed in Guangdong, Guangxi and Hainan. Ia initially occurred in 2009, it shoot up to 32.1% in 2010,but decreased to 16.1% in 2011 before went up to 45.2% in 2012. Ib sporadically occurred during2007–2011, III onlyoccurred in 2012. 14 different PFGE types, including 4 new types(N, O,P and Q), were observed, in which B, D, F and G were the predominant types, holding 83.9%(141/168) of the total GBS strains. Ia corresponded to 11 PFGE types(A–H, N–P), in which type D predominated(51%). Ib represented 3 genotypes(I, J and Q) and III harbored only 2genotypes(N and F). Type N and Fsynchronously presented in Ia and III. In summary, the genetic diversity of tilapia GBS varied by serotypes and changed with geographical locations and years.Although Iastillpredominated, new rareserotypeIII alreadyoccurred in China. 相似文献
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Growth hormone (GH) and reproduction: a review 总被引：5，自引：0，他引：5
Florence Le Gac Odile Blaise Alex Fostier Pierre-Yves Le Bail Maurice Loir Brigitte Mourot Claudine Weil 《Fish physiology and biochemistry》1993,11(1-6):219-232
Interaction between growth and reproduction occurs in many vertebrates and is particularly obvious at certain stages of the life cycle in fish. Endocrine interactions between the gonadotropic axis and the somatotropic axis are described, the potential role of GH being emphasised. A comparative analysis of these phenomena in mammals, amphibians and fish, suggests a specific role of GH in the physiology of puberty, gametogenesis and fertility. It also shows the original contribution made by studies on the fish model in this field of investigations. 相似文献
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Two gonadotropins (GtH; Qa and Qb) were purified by gel filtration and ion exchange chromatography from the pituitaries of Indian walking catfish (Clarias batrachus). The presence of GtH during purification was assessed by in vitro oocyte maturation and in vivo steroidogenic activity, and their identities were determined by elution profiles, molecular weight, biological activities and yield. The molecular weights of Qa and Qb were 37 and 42 kDa, respectively, and composed of distinct subunits (Qa: 20 and 14 kDa and Qb: 26 and 18 kDa). Polyclonal antibodies raised against Qa immunostained Qa, Qb and pituitary GtH cells. A competitive Qa‐ELISA was developed whose sensitivity was 6.25 ng mL?1 (1.25 ng well?1) with intra‐ (3.5%) and inter‐ (12.4%) assay coefficients of variation. Displacement curves parallel to the standard were obtained with plasma and pituitary extracts of catfish, Qb and carp GtHII. The assay was validated by measuring the plasma Qa levels after LHRH treatment and in relation to ovarian growth in the female catfish during different reproductive phases. Based on the results, Qa and Qb corresponded to fish LH and FSH respectively. The findings will increase the knowledge of the mechanisms controlling fish reproduction and identification of sensitive phases in fish in captivity for hormonal manipulation. 相似文献
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Controlled infection of Poecilia reticulata Peters (guppy) with Tetrahymena by immersion and intraperitoneal injection 
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下载免费PDF全文 G Sharon M Pimenta‐Leibowitz M C L Vilchis N Isakov D Zilberg 《Journal of fish diseases》2015,38(1):67-74
Tetrahymena is a protozoan parasite, which infects guppy, Poecilia reticulata Peters, and causes substantial economical losses in commercial farms worldwide. Studies of guppy infected by Tetrahymena require standardized infection protocols. The LD50 for Tetrahymena infection of guppies by intraperitoneal (IP) injection was calibrated, and the level obtained was 946 parasites per fish. Guppy infection with Tetrahymena by immersion, imitating the natural route of infection via the integument, was studied under normal or stress conditions. Exposure to cold and netting (CNI) and to cold only (CI) followed by immersion exposure to 10 000 Tetrahymena per mL resulted in 22.5% and 19.2% mortality, respectively, as compared to 14.2% and 10% in groups that were netted only (NI) or non‐stressed (I). Histopathology revealed that immersion infection resulted in a systemic infection. Lysozyme levels, measured 3 weeks after infection, were significantly higher in the CNI group (288 μg per mg protein) compared with CI‐, NI‐ and I‐treated groups (94.5, 64 and 62.3 μg mg?1, respectively). There was no evident parasite immobilization activity in body homogenates, suggesting no development of acquired immunity. Re‐infection by IP injection revealed no increase in protection in any of the treatment groups, mortality range of 56.3–75%, higher than in the non‐exposed control (40.6% mortality). 相似文献
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Iciar Martinez Amaya Velasco Ricardo Pérez-Martín Eskil Forås Michiaki Yamashita Carmen G. Sotelo 《Journal Of Aquatic Food Product Technology》2013,22(4):289-297
The purpose of this work was to evaluate the suitability of a method based on the presence of two restriction sites (for Hae III and Hindf I) in the mitochondrial NADH dehydrogenase subunit 5 (mt ND5) gene to identify Scomber species. The evaluation was performed on 144 reference and market samples by sequencing of the entire 505-bp fragment of the mt ND5 gene and of a 464-bp fragment of the Kocher fragment of the cytochrome b gene (mt Cytb). Sequence analysis of any of the two fragments allows the identification of each of the four Scomber species, but S. japonicus and S. colias had the same restriction sites at the ND5 amplicon and would not have been differentiated by this analysis. Similarly, loss of the Hae III site in some S. scombrus individuals would have misidentified them as not being Scomber. All the market products were correctly labeled except one acquired in Spain labeled as originating in the Atlantic and containing S. japonicus. 相似文献
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The endemic, anadromous cyprinidChalcalburnus tarichi is the only fish species known to occur in alkaline Lake Van (Eastern Anatolia, Turkey). EightC. tarichi were maintained individually in Lake Van water (17 – 19°C; pH 9.8; 153 mEq·I–1 total alkalinity; 22 total salinity) and tank water samples analyzed for 24 h in 2 to 4 h intervals. At zero time, < 1µM ammonia was present and urea was undetectable in the tank water; at 24 h, total ammonia and urea made up 114±32 and 35±25µM, respectively. Over the experimental period, ammonia-N and urea-N excretion averaged 1041±494 and 607±169moles·kg–1 fish·h–1, respectively. The extent of urea excretion was highly variable between specimens. Uric acid excretion was not detectable.Urea was present at high concentrations in all tissues and plasma (25 – 35moles·g–1·ml–1) of freshly caughtC. tarichi; total ammonia content of the tissues was by a factor of 1.9 (liver) to 3.0 (brain) lower. High arginase activity (2.4±0.2 U·min–1·g–1) was detected in the liver ofC. tarichi but ornithine carbamoylphosphate transferase, a key enzyme of the ornithine-urea-cycle, was absent. Ureagenesis is likely through degradation of arginine and/or uricolysis. High glutamine synthetase activity (11±0.6 U·min–1·g–1) and low ammonia content in brain suggest that, like other teleosts,C. tarichi has an efficient ammonia detoxification in the brain, but in no other tissue.Nitrogenous waste excretion at alkaline pH is discussed. The ability ofC. tarichi to excrete high levels of ammonia at extremely alkaline pH is unique among teleosts studied so far. The mechanism of ammonia excretion under Lake Van conditions remains to be elucidated. 相似文献
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There has been growing concern about the overuse of antibiotics in the ornamental fish industry and its possible effect on the increasing drug resistance in both commensal and pathogenic organisms in these fish. The aim of this study was to carry out an assessment of the diversity of bacteria, including pathogens, in ornamental fish species imported into North America and to assess their antibiotic resistance. Kidney samples were collected from 32 freshwater ornamental fish of various species, which arrived to an importing facility in Portland, Oregon from Colombia, Singapore and Florida. Sixty‐four unique bacterial colonies were isolated and identified by PCR using bacterial 16S primers and DNA sequencing. Multiple isolates were identified as bacteria with potential to cause disease in both fish and humans. The antibiotic resistance profile of each isolate was performed for nine different antibiotics. Among them, cefotaxime (16% resistance among isolates) was the antibiotic associated with more activity, while the least active was tetracycline (77% resistant). Knowing information about the diversity of bacteria in imported ornamental fish, as well as the resistance profiles for the bacteria will be useful in more effectively treating clinical infected fish, and also potential zoonoses in the future. 相似文献
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Effect of iodophor disinfection of non‐hardened Salmo trutta eggs on their bacterial and fungus load 下载免费PDF全文
下载免费PDF全文 Franz Lahnsteiner 《Aquaculture Research》2017,48(7):3901-3909
This study investigated the efficiency of iodophor disinfection (135 ppm active iodine for 15–30 min) of non‐hardened Salmo trutta eggs against different groups of bacteria and against fungus. Egg samples were taken from non‐disinfected and from disinfected eggs, microorganisms were cultured on specific nutrient media and their mass was measured by turbidimetric methods. Bacteria and fungus mass of non‐hardened eggs could be reduced but not eliminated by iodophor disinfection with 135 ppm active iodine for 15 min. The extent of reduction was 47–65% (Experiment 1). The efficiency of disinfection increased with disinfection time as the reduction in bacteria and fungus mass was 40–55% after 15 min and 58–74% after 30 min (Experiment 2). Disinfection efficiency of iodophor solution diluted in water (reduction 49–57%) and of iodophor solution diluted in sodium chloride solution iso‐osmolar to the oocytes (reduction 52–61%) was similar (Experiment 3). The reduction in bacteria and fungus mass was persistent as it was 39–72% lower in embryos deriving from disinfected eggs than in embryos deriving from non‐disinfected ones (Experiment 4). In conclusion, the tested disinfection method is inadequate to eliminate pathogens completely but it could positively influence immune defence of eggs and embryos. 相似文献