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1.
《水产科技情报》2000,(4):190-191
墨西哥试养纹眼笛鲷　　纹眼笛鲷在日本已进行商业化养殖 ,但在别国均尚未开展养殖。为此 ,墨西哥水产研究人员利用养虾池进行了网箱试养。9个网箱规格均为 1m3 ,使用网目为 6～ 8mm的网片缝制 ,分别设置于面积均为 2 50 0 m2 的养虾池中。将从河口捕获的纹眼笛鲷放养于网箱中 ,放养密度分别为6、9、12尾 /m3 ,每种密度设 3个重复。试验鱼体重 11～ 2 3g,平均体重 17g,放养量为 0 .10～0 .2 1kg/m3 。日投饵率为鱼体重的 10 %。 4个月平均水温分别为2 3、2 6、2 8、30℃ ,池水盐度分别为36‰、38‰、39‰、4 0‰ ,溶氧分别为 7.6、8.0、7.6…  相似文献   

2.
2000年8月至2001年1月在南沙群岛美济礁潟湖内开展网箱养殖试验，共选养了4种鱼：军曹鱼、美国红鱼、红鳍笛鲷和鲑点石斑鱼。在2000年8月3日——2001年2月20日近7个月内，军曹鱼生长最快，最大个体重10500g，月均增重范围为1300——443g／(月&;#183;尾)(单位下同)，平均852g；美国红鱼次之，最大个体重2350g，月均增重范围为296—246g，平均271g；红鳍笛鲷最大个体重1450g，月均增重范围为130—101g，平均116g；石斑鱼生长最慢，最大个体重275g，月均增重范围为31—9g，平均17g。军曹鱼、美国红鱼、红鳍笛鲷和鲑点石斑鱼4种鱼平均体长分别达到68．3cm(范围54—77)、46cm(48—44)、35．0cm(37—34)和16．8cm(21．0～14．0)：体长月均增长分别为61，33，15和8mm。军曹鱼饵料系数达到3．0，红鳍笛鲷和美国红鱼饵料系数则为4．0；成活率分别为92．1％，61．8％，84．7％和59．5％。  相似文献   

3.
暗纹东方鲀全人工繁殖及苗种培育技术   总被引：2，自引：0，他引：2  
水库网箱中培育暗纹东方鲀亲鱼。使用激素人工催产。共催产15组。催产率100％。水温22～25℃时效应时间多为33～52h。圆锥形玻璃缸桶孵化，22～25℃时经96h开始出苗。经仔鱼(2．5～3．7mm)培育、中后期培育。5月下旬出塘，平均全长6．5cm平均体重8．3g。  相似文献   

4.
1999年在广西水产研究所中试基地进行了南美白对虾池塘淡水养殖试验。在600cm^2的淡水池塘中投放平均全长2．35cm的淡化虾苗2．5万尾,经70d饲养,生产成虾98kg,平均亩产量108．9kg,成虾平均全长9．59cm(最大为10．6cm),平均体长8．34cm(最大为9．4cm),平均体重7．73g(最大为11．5g),养殖成活率为50．7％。  相似文献   

5.
为评价湛江沿海涉海工程建设过程中引起的悬浮物质对附近海区海洋动物的影响,研究了底泥液相及不同浓度底泥悬浮物对川纹笛鲷和尖吻鲈的致死效应。试验结果表明,在8d的试验时间里,底泥水相对川纹笛鲷和尖吻鲈均无致死效应。底泥悬浮物浓度≤160mg/L时,川纹笛鲷和尖吻鲈的死亡率均处于较低水平。底泥悬浮物浓度≥2560 mg/L时,川纹笛鲷死亡率达75%,尖吻鲈死亡率达70%。通过概率单位法计算得出川纹笛鲷的8d半致死浓度为716.14 mg/L,尖吻鲈的8d半致死浓度为1105.096 mg/L。  相似文献   

6.
1月29日，三亚市科技工业信息化局组织专家对三亚福联水产发展有限公司承担的“斑石鲷的引种及工厂化养殖技术与推广”项目（编号：2014CZ02）进行现场测试。测试数据表明，2014年6月5日引进的斑石鲷共存活170尾，成活率85.0%，平均全长26.3cm，平均体高13.3cm，平均体重638.2g/尾；2014年8月12日引进的斑石鲷共存活21000尾，成活率79.2%，平均全长24.0cm，平均体高12.2cm，平均体重498.0g/尾；2014年9月16日引进的斑石鲷共存活30000尾，成活率92.3%，平均全长21.0cm，平均体高10.0cm，平均体重274.6g/尾。  相似文献   

7.
断斑石鲈(Pomadasy hasta)网箱养殖技术研究   总被引：1，自引：0，他引：1  
本文对平均全长3cm、平均体重0.41g的断斑石鲈幼鱼进行网箱养殖试验.结果表明:(1)断斑石鲈在体重50g以下生长速度最快,月增重最高达8.3倍.(2)适宜的生长水温在25～29℃之间;16℃以下几乎停止摄食,出现负增长;水温14℃以下持续数天,体弱者皮肤出现溃疡或死亡.(3)幼鱼经15个月的网箱养殖,从平均全长3cm增长到平均全长25cm、平均体重525g的商品鱼,成活率达68.3%.  相似文献   

8.
本文报道了双斑东方Tun网箱养殖试验。其结果：在水温13－30℃，盐度23.4-27.3条件下，平均全长4.3cm，平均体重2.8g鱼苗，经11个月试养，平均全长达17.0cm，平均体重达130.4g，成活率为42％。此外，本文还探讨了水温对双斑东方Tun生长及成活率的影响。  相似文献   

9.
胡椒鲷人工繁殖及育苗技术   总被引：1，自引：0，他引：1  
本文报道福建省水产研究所2001年胡椒鲷人工繁育、育苗过程和结果。亲鱼经增温强化培育后，注射DOM、LRH－A2或LRH－A3、HCG等催产药物，水温20.1-26.8℃、盐度20.8-26.0条件下，效应时间为36－40h。受精卵在水温20.0-26.0℃、盐度20.0-25.0条件下，经15－25h孵出。50万尾仔鱼经42d土池生态培育后，共培育出平均全长5.4cm、平均体重3.8g变态完整的鱼苗26250尾，育苗成活率为5.25％。  相似文献   

10.
在冷泉水养殖条件下进行史氏鲟和杂交鲟(史氏鲟♀×西伯利亚鲟♂)鱼种的饲养试验,史氏鲟和杂交鲟鱼种的平均体重分别为(2.51±0.57)g和(2.16±0.33)g;平均全长分别为(6.55±0.69)cm和(6.11±0.33)cm;试验期水温为18~22℃。经70 d人工培育,投喂含48%粗蛋白的人工配合饲料,史氏鲟和杂交鲟鱼种的平均体重分别达到(22.25±5.53)g和(26.19±6.16)g,平均全长分别达到(13.87±0.61)cm和(14.17±0.77)cm。杂交鲟鱼种平均体重和平均全长特定生长率均高于史氏鲟。以Bertalanffy非线性生长模型算得的史氏鲟和杂交鲟鱼种体重生长拐点分别为67 d和71 d,全长生长拐点日龄分别为30 d与33 d;全长生长拐点的出现先于体重拐点;杂交鲟鱼种体重和全长生长拐点比史氏鲟鱼种分别推迟4 d和3 d,杂交鲟鱼种全长生长增速持续时间大于史氏鲟鱼种。  相似文献   

11.
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12.
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   

13.
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   

14.
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15.
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   

16.
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   

17.
Growth hormone (GH) and reproduction: a review   总被引：5，自引：0，他引：5  
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   

18.
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   

19.
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   

20.
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