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试验设计3个温度16．0～17．0℃、18．5～20．5℃和22．0～24．0℃，采用3种催产剂组合催产，对花[鱼骨]人繁子代亲鱼进行催产试验。试验表明：用HCG1000IU／kg＋LRH—A21．2μg／kg、DOM5．0mg／kg＋LRH—A21．2μg／kg、PG3．0mg／kg＋LRH—A21．0μg／kg组合均能成功催产人繁子代花[鱼骨]亲鱼。其中，在18．5—20.5℃和22．0—24．0℃催产中，DOM5．0mg／kg＋LRH-A21．2μg/kg具有较短的催产时间和较高的催产率、受精率。人繁子代亲鱼在池塘培育条件下完全可以进行人工催产，花[鱼骨]可以像“四大家鱼”一样进行全人工繁殖。 相似文献
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通过对鸭绿沙塘鳢(odontobuds yaluensis)亲鱼培育、人工催产和孵化技术的初步研究,旨在完善其规模化人工繁殖及育苗技术,为大规模人工繁殖和养殖奠定基础。结果表明,人工催产显著提高了鸭绿江沙塘鳢的产卵率,即采用两次肌肉注射,催产剂为促黄体素释放激素A2(LHRH一A2),地欧酮(DOM)及绒毛膜促性腺激素(HCG);最佳剂量第一次注射:LHRH-A24.0μg/kg、DOM 2.0mg/kg、HCG 300IU/kg;第二次注射:LHRH-A28.0μg/kg、DOM 5.0mg/kg、HCG 1 500IU/kg,产卵率20%,产出卵受精率达61%。采用不间断充气和定期换水孵化,孵化率和仔鱼成活率分别为40%和53%。 相似文献
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褐斑尖塘鳢人工催产技术 总被引：2，自引：0，他引：2
选择池塘养殖的褐斑尖塘鳢经水泥池培育后催产。水温27．5℃～28．1℃之间，单独使用HCG剂量为1000国际单位／kg，催产效应时间为52～53小时；混合使用LRH～A DOM剂量为40μg 10mg／Kg至50μg 12mg／Kg，催产效应时间为45～46小时。 相似文献
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从试验研究和生产实践中总结出细鳞鲴规模化人工繁育技术,对具体技术进行了描述、量化说明和讨论。细鳞鲴规模化人工繁育是项综合技术,其关键技术是催产药物配伍及其用量、自然产卵受精脱粘材料的选用和鱼苗至夏花阶段的培育。最佳的催产药物是促黄体素释放激素LHRH—A2＋地欧酮（DOM）＋绒促性素（HCG）,雌鱼剂量（LHRH—A210μg＋DOM5mg＋HCG300 IU）／kg,雄鱼减半。自然产卵受精脱粘材料宜选用滑石粉、食盐液（滑石粉200g、食盐25g加水5kg搅匀）。鱼苗至夏花阶段的关键是要培育适口的天然饵料和掌握鱼苗下塘时机。 相似文献
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对人工驯化的黑尾近红鲐进行人工药物催情、产卵和孵化。结果表明：用激素PG＋HCG＋LRH—A2、HCG＋LRH—A24-DOM、PG4-LRH—A2＋DOM、HCG＋LRH—A：组合催情,催产率100％,受精率72．4％～97．9％,孵化率63．80％～80．4％。 相似文献
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试验设计3个温度16.0~17.0℃、18.5~20.5℃和22.0~24.0℃,采用3种催产剂组合催产,对花人繁子代亲鱼进行催产试验。试验表明:用HCG 1000 IU/kg LRH-A21.2μg/kg、DOM5.0 mg/kg LRH-A21.2μg/kg、PG 3.0 mg/kg LRH-A21.0μg/kg组合均能成功催产人繁子代花亲鱼。其中,在18.5~20.5℃和22.0~24.0℃催产中,DOM 5.0 mg/kg LRH-A21.2μg/kg具有较短的催产时间和较高的催产率、受精率。人繁子代亲鱼在池塘培育条件下完全可以进行人工催产,花可以像“四大家鱼”一样进行全人工繁殖。 相似文献
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2007-2008年对39尾,4～5龄,雌鱼体长36～41 cm,体质量 2.5～2.9 kg,雄鱼体长 32～35 cm,体质量 1.5～1.6 kg的缺帘鱼亲鱼用 HCG、PG、LHR-A_2、DOM 4种催产药物,按5种组合(设置每千克体质量:HCG 300 IU + LHR-A_2 2.5 μg + DOM 2 mg、 HCG 3500 IU +PG 2 mg + LHR-A_2 3 μg + DOM 3 mg、PG 4 mg + LHR-A_2 6 μg + DOM 2 mg、HCG 700 IU + DOM 2 mg、LHR-A_2 5 μg + DOM 4 mg)进行催产试验,催产水温27～28 ℃,采用两针注射,效应时间 9～10h.5种组合的平均催产率分别为75.2%、75.4%、75.5%、60%、60.3%;平均受精率为76.6%;平均孵化率为68.5%;平均出苗率为72.2%;出膜时间为17～18 h;孵化水温27～28 ℃,20尾雌鱼共产卵59 560粒;共获苗种23 469尾. 相似文献
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Association between the interannual variation in the oceanic environment and catch rates of bigeye tuna (Thunnus obesus) in the Atlantic Ocean 
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下载免费PDF全文 The environmental processes associated with variability in the catch rates of bigeye tuna in the Atlantic Ocean are largely unexplored. This study used generalized additive models (GAMs) fitted to Taiwanese longline fishery data from 1990 to 2009 and investigated the association between environmental variables and catch rates to identify the processes influencing bigeye tuna distribution in the Atlantic Ocean. The present findings reveal that the year (temporal factor), latitude and longitude (spatial factors), and major regular longline target species of albacore catches are significant for the standardization of bigeye tuna catch rates in the Atlantic Ocean. The standardized catch rates and distribution of bigeye tuna were found to be related to environmental and climatic variation. The model selection processes showed that the selected GAMs explained 70% of the cumulative deviance in the entire Atlantic Ocean. Regarding environmental factors, the depth of the 20 degree isotherm (D20) substantially contributed to the explained deviance; other important factors were sea surface temperature (SST) and sea surface height deviation (SSHD). The potential fishing grounds were observed with SSTs of 22–28°C, a D20 shallower than 150 m and negative SSHDs in the Atlantic Ocean. The higher predicted catch rates were increased in the positive northern tropical Atlantic and negative North Atlantic Oscillation events with a higher SST and shallow D20, suggesting that climatic oscillations affect the population abundance and distribution of bigeye tuna. 相似文献
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In this experiment, a feeding trial was performed to determine the effects of fructooligosaccharide (FOS) on growth performance, digestive enzyme activity and immune response of Japanese sea bass, Lateolabrax japonicus juveniles (initial weight 38.3 ± 0.5 g), and the fish were examined following feeding with six levels of FOS (0, 0.5, 1, 2, 4 and 6 g/kg) for 28 days. Significant enhancement of weight gain (WG) and specific growth rate (SGR) was found in fish fed 1 g/kg FOS incorporated diets (p < .05), while the feed conversion ratio (FCR) in the 1, 2 g/kg FOS groups reduced significantly compared with the control (p < .05). Besides, the crude lipid in the 4, 6 g/kg FOS groups increased significantly compared with the control (p < .05). On the other hand, the erepsin and lipase activities significantly elevated in intestine of fish fed 2 g/kg FOS (p < .05) and the lysozyme activity in serum of fish fed 2 g/kg FOS were significantly higher than that in the control (p < .05). Moreover, the alkaline phosphatase activities in serum of fish fed 0.5, 1, 2 g/kg FOS were significantly higher than in control (p < .05). Regression analysis showed that the relationships between dietary FOS levels and either SGR, FCR, erepsin or lysozyme activities were best expressed by regression equations, and the optimal inclusion levels are 1.37, 1.80, 3.06, 3.11, 1.93 and 1.80 g/kg for SGR, FCR, erepsin, lipase, lysozyme and total superoxide dismutase activities, respectively. Overall, this study revealed that FOS incorporated diets could beneficial for L. japonicus culture in terms of increasing the growth, digestion and immune activities. Under the present experimental condition, the optimal supplementary level of FOS in the diet of L. japonicus is 1–3 g/kg. 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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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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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 下载免费PDF全文
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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