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南方鲶晚期胚胎细胞经原代和传代培养４０次，历时３６个月建立了上皮型细胞系（ＳＭ）。该细胞系表现低世代生长缓慢，每代时间随代龄增加而减少，经ＦＭＦ测定：Ｇ１期细胞占７０．％－８５．６％；Ｓ期细胞占１２．２％－２５．３％，Ｇ２＋Ｍ期细胞占１．６％－４．６％，由３０代到４０代Ｇ２＋Ｍ细胞增加了一倍多，ＳＭ细胞能在１－４℃冰箱长期存活并可保持繁殖能力达１３个月。 相似文献
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中国对虾上皮样细胞培养研究 总被引：8，自引：1，他引：8
１９８９年８月起进行了中国对虾上皮细胞的原代和传代细胞培养。对取自甲壳，步足等部位的对虾上皮组织培养研究，共培养６批，获得传代细胞１１株，其中１株传至２５代，传代细胞形态为梭形和下沉上皮细胞形态相似。生长率测定结果，第４天细胞增殖达高峰，倍增时间为４８．７２ｈ。 相似文献
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斑点叉尾(鱼回)肾脏组织细胞系的建立及其生物学特性 总被引：1，自引：0，他引：1
采用组织块移植培养技术,对来源于斑点叉尾(鱼回)(Icttalurus punctatus Rafinesque)肾脏组织的细胞进行原代培养,建立了斑点叉尾(鱼回)肾脏组织细胞系,定名为CCK,目前已稳定传代培养70多次.斑点叉尾(鱼回)肾脏组织细胞为成纤维样细胞,最佳培养基为M199,最适培养温度范围为28～32℃,培养基血清体积分数为10%.在此条件下,CCK细胞的倍增时间为38.9～41.0 h.斑点叉尾(鱼回)肾脏细胞的集落形成效率为(74.16±3.54)%,第9代传代细胞的染色体数目为正常二倍体2n=58,第33代传代细胞的染色体众数为60.液氮冷冻保存6个月后复苏的细胞经台盼兰染色检验,(86.69±1.04)%的细胞仍保持活性,细胞复苏后培养生长旺盛.通过对第17代离体培养细胞的28S rRNA基因进行PCR扩增及序列分析与比对,表明该细胞系来源于斑点叉尾(鱼回).[中国水产科学,2009,16(1):75-81] 相似文献
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斑点叉尾鮰肾脏组织细胞系的建立及其生物学特性 总被引：3，自引：1，他引：2
采用组织块移植培养技术,对来源于斑点叉尾鮰（lctalurus punctatus Rafinesque）肾脏组织的细胞进行原代培养,建立了斑点叉尾鮰肾脏组织细胞系,定名为CCK,目前已稳定传代培养70多次。斑点叉尾鮰肾脏组织细胞为成纤维样细胞,最佳培养基为M199,最适培养温度范围为28～32℃,培养基血清体积分数为10％。在此条件下,CCK细胞的倍增时间为38．9～41．0h。斑点叉尾鮰肾脏细胞的集落形成效率为（74．16±3．54）%,第9代传代细胞的染色体数目为正常二倍体2n=58,第33代传代细胞的染色体众数为60。液氮冷冻保存6个月后复苏的细胞经台盼兰染色检验,（86．69±1．04）％的细胞仍保持活性,细胞复苏后培养生长旺盛。通过对第17代离体培养细胞的28S rRNA基因进行PCR扩增及序列分析与比对,表明该细胞系来源于斑点又尾鮰。 相似文献
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大量培养多刺裸腹溲的研究 总被引：5，自引：1，他引：5
试验研究了培养多刺裸腹溲的饵料、环境条件和大规模培养方法，结果表明：水温２５－２８℃、ｐＨ值７．１－８．３自然光照、使用饲料酵母２４－３２ｍｇ（干重）／Ｌ或活酵母５０万个细胞／ｍｌ，６天内裸腹溲可达５０００个／Ｌ密度，水温是影响其繁殖的主要因子，大规模培养裸腹溲宜用扩大培养一次收获法。 相似文献
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目的探讨不同仔猪血清浓度对金华猪耳缘组织成纤维细胞体外培养的影响,初步确定体外培养时仔猪血清浓度。方法采用组织块贴壁培养法在含5%、10%、15%浓度的仔猪血清培养基中培养,观察其细胞的形态,并采用MTT法进行细胞增殖试验。结果含10%、15%仔猪血清培养液相对于含5%仔猪血清培养液的条件下,细胞从组织块迁移出来时间短,传代的成纤维细胞,增殖迅速,细胞活力强,MTT值明显增高(P 0. 05),10%血清与15%血清比较,差异无显著意义(P 0. 05)。结论说明在10%仔猪血清浓度的条件下,采用组织块贴壁培养法进行体外培养,传代细胞活力强、增殖迅速。 相似文献
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海洋枝角类是稚幼鱼的理想活饵料，１９９７年４月－６月进行鸟喙尖头溲的培养的试验。在水温为１９－２６℃，盐度为２４－２８％的条件下，在４个０．５吨的水泥池中，单用面包酵母培养，经过１２－１６天。生殖量大，平均每个成体每胎可产１３个幼体，水泥池中使用酵母培养的平均只产４．２５个。 相似文献
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湛江叉鞭金藻生态条件的研究1．营养盐浓度对湛江叉鞭金藻增殖的影响 总被引：2，自引：0，他引：2
１９９０年３月１５日－４月９日在室内自然温度变化条件下（１１－１８℃），采用浓度１－５‰的康威营养盐溶液培养湛江叉鞭金藻。结果表明，３‰浓度对增殖效果最好，经６天培养，细胞密度由６５．５－７６．０×１０４ｍｌ－１。 相似文献
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草鱼胸腺细胞培养方法主要有机械分散法和消化分离法。胸腺细胞绝大部分是由大、中、小淋巴细胞组成．而淋巴细胞为悬浮细胞．培养悬浮细胞时由于细胞中期分裂相与培养的细胞不易区分，其传代时阃只能凭知胞计数推测其密度来确定是否可以进行细胞传代。在培养草鱼胸腺细胞时．在细胞培养液中加入PHA．观察培养结果可发现能使草鱼胸腺细胞成团生长．增殖旺盛。 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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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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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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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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Qin-Cheng Huang Di‐Gen Qin Bei‐Ping Tan Tao Du Yuan-Zhi Yang Qi-hui Yang Shu‐Yan Chi Xiao-hui Dong 《Aquaculture Research》2020,51(2):816-827
A 5 × 3 factorial growth trial was conducted to evaluate optimal dietary protein and lipid levels (dietary protein level, DP; dietary lipid level, DL) for juvenile Sillago sihama (S. sihama) (2.0 ± 0.02 g, initial weight). Fish were fed 15 diets containing 5 DPs (350, 400, 450, 500 and 550 g/kg) and 3 DLs (60, 90 and 120 g/kg) for 8 weeks. The interaction between proteins and lipids significantly influenced the feed conversion ratio, condition factor, body composition, antioxidant indices and lipase activity (p < .05). DP 450 g/kg showed the highest average final body weight. DPs 500 and 550 g/kg significantly decreased the protein efficiency ratio (p < .05). DL 120 g/kg showed the highest percentage weight gain. The low feed conversion ratio was found in diets P45L12, P55L9 and P55L12. Diet P45L12 showed high superoxide dismutase activities. DP 450 g/kg showed the lowest average malondialdehyde content. Lipase activity was increased by increasing DP (p < .05) with a fall at DP 550 g/kg. Under the present experimental conditions, the optimal DP for S. sihama was 450 g/kg under the DL 120 g/kg. 相似文献
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Cholecalciferol (Vitamin D3) increased plasma inorganic phosphate concentration in American eels,Anguilla rostrata, in a dose-dependent fashion. This response was more marked in phosphate loaded fish. In control as well as phosphate loaded
eels the hyperphosphatemic response to D3 was associated with a sharp reduction in renal phosphate clearance relative to14C-polyethelene glycol (PEG) clearance. Glomerular filtration and urine flow rates were not affected by D3. As renal phosphate clearance, even in phosphate loaded eels, never significantly exceeded that of PEG, it is suggested that
D3 reduced the relative clearance rate of phosphate by increasing renal phosphate reabsorption rather than by reducing the tubular
secretion of phosphate. 相似文献