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1.
放养量4.5-6kg/m^3,饲养期约100天,单产27.0-32.6kg/m^3,饵料系数1.3-1.75,成本利润率56.9%-75.2%,能量转换率17.9%-23.9%。试验表明在我国北方网箱养非鱼能取得较高的经济效益。  相似文献   

2.
采用自育自繁亲虾,用温泉水高温,人工育苗18.59万尾(0.8-1.0cm),最高育苗密度10.3万尾/m^3,成活率84.5%;外购亲虾用锅炉提温,人工育苗7.79万尾(1.65cm),育苗密度5.53万尾/m^3,成活率64.98%,孵化育苗水温26.0-30.0℃、PH7-8.5、盐度12-14‰、溶氟4-6.5mg/l,氨氮0.3-0.8mg/l。本试验表明,罗氏沼虾人工孵化育苗,在辽宁地  相似文献   

3.
放养4.5-6kg/m^3,饲养期约100天,单产27-32.6kg/m^2,饲养系数1.3-1.75,成本利润56.9%-75.2%,能量转换率17.9%-23.9%,试验表明在我国北方网箱养武昌鱼能取得较高的经济效益。  相似文献   

4.
柳富荣 《内陆水产》2000,25(8):11-12
1999年5月~2000年4月,对垸内胜利湖和垸外新河的8只网箱养殖加州鲈效果进行了比较。结果表明,外河4只网箱养殖加州鲈平均净单产28.9~30.5kg/m^2,成活率86.0%~91.2%,增重倍数14.5~19.0,依次比内湖4只网箱的净产量(22.4~24.7kg/m^2)、成活率(81.0%~85.6%)、增重倍数(12.0~15.2kg/m^2)分别高4.7~6.1km/m^2、4.0%~5.6%、2.4~3.8kg/m^2;此外,相同水域不同放养密度的产量、成活率、增重倍数也有明显差别。  相似文献   

5.
中华绒螯对强杀虫灵的96hTLM植为3.5g/m^3,安全浓度为0.35g/m^3,在0.1g/m^3灭虫精溶液中96h未死亡,但有急性中毒反应;在1.0g/m^3,1.2g/m^3,1.4g/m^3硫酸铜溶液中,蟹种虽能蜕壳,但蜕壳后4~8h即死亡,在0.09ml/m^320%杀灭菊酯96h未出现异常及死亡现象;在1.75g/m^3菊乐合酯中96h表现正常。  相似文献   

6.
提高罗氏沼虾单位水体出苗量试验   总被引:1,自引:0,他引:1  
1991-1992年利用对虾育苗进行了提高罗氏沼虾单位水体出苗量试验。15个试验池总水体79.5m^3,共出虾苗404.23万尾,平均5.08万尾/m^3,最高6.35万尾/^3.1992年12月专家鉴定认为,本成果达国内先进水平。  相似文献   

7.
澳州甘旨鱼又称银鲈、金鳟鱼,原产于澳州河流水域,具有生长快、肉质好、价值高等特点,1998年少量引进我省。我们于1999年10月31日引进全长4.5~5.0cm的幼苗2968尾试养,11月13~14日部分暴发细菌性烂尾病,36h累计死亡158尾,占全池鱼苗数的13%。经及时治疗,病鱼停止死亡,基本治愈。现将情况介绍如下。1放养鱼苗经拉网锻炼、上箱吊水,6h氧气袋加冰密封运输,兽用痢特灵(片剂,下同)40g/m'浸泡3~8min下池,分网箱和水泥池两种模式计3个水体强化培育。网箱规格为5.0mx2…  相似文献   

8.
“高效鱼虫灭”对草鱼,白鲢越冬鱼种48-72h的Tlm分别为2.5、2.33ml/m^3,安全浓度分别为0.75、0.699ml/m^3;对草鱼,白鲢越冬鱼种72h的最低致死浓度均为0.5-1ml/m^3,致死率分别为20%、25%;对鳙鱼越冬鱼种的最低致死浓度大于3ml/m^3;青虾,淡水白鲳、枝角类对高效鱼虫灭敏感。  相似文献   

9.
EDTA对紫彩血蛤幼虫发育的影响   总被引:7,自引:0,他引:7  
本文研究了EDTA对紫彩血蛤幼虫生长,存活和变态的影响。结果表明,所有试验的EDTA浓度均能促进幼虫生长,前期3.0×10^-6浓度组生长最快,幼虫平均壳长由对照组的235.6μm增至239.7μm,后期则以1.0×10^-6浓度且生长最快,幼虫平均壳长由对照组的247.4μm增至253.0μm;0.5×10^-6-5.0×10^-6EDTA均能提高幼虫的存活率和变态率,其中以1.0×10^-6效  相似文献   

10.
在水库中连续3年设置网箱养殖罗非鱼,按4.5 ̄6kg/m^3放养量投放鱼种(平均规格63 ̄95g/尾),饲养100天左右,平均规格达到374 ̄438.8g尾产量达27.0 ̄32.6kg/m^2,饲料系数1.3 ̄1.75,利润率达56.9% ̄75.2%,网箱养鱼能量转移率17.9% ̄23.96%。  相似文献   

11.
The variation of virulence of Renibacterium salmoninarum , the causative agent of bacterial kidney disease (BKD) in salmonid fish, was studied by infecting rainbow trout, Oncorhynchus mykiss (Walbaum), with two isolates (strains 325 and 932) from diseased Atlantic salmon, Salmo salar L., and one isolate (strain 4366) from an apparently healthy Atlantic salmon. Coho salmon, Oncorhynchus kisutch (Walbaum), were injected with the strain 932 to estimate difference in fish species resistance. Fish were removed by random sampling for other study purposes, a study design possible with analysis of lifetime distributions incorporating both sampling-, death- and survival-times. At the end of the experiment, the rainbow trout infected with strains 325, 932 and 4366 had a survival probability of 33%, 51% and 72%, respectively. The coho salmon infected with strain 932 had a 26% survival probability. The strain differences were significant according to the log-rank test, and the risk ratio between the strains ranged from 1·8 to 5·4. The strain from the apparently healthy fish was least virulent. The survival of the fish species was different over time. Rainbow trout were more likely to die early in the time course, but high numbers of coho died later, resulting in an overall risk of mortality of 1·4 in favour of rainbow trout. Differences in virulence may reflect changed selective pressure on R. salmoninarum when introduced from feral stocks into the environment of fish farms.  相似文献   

12.
水硬度对七彩神仙鱼幼鱼发育的影响   总被引:4,自引:0,他引:4  
采用不同硬度的水对七彩神仙鱼幼鱼进行饲养。6周龄幼鱼在硬度为7.94°dH±0.30°dH时饲养84d后,比在硬度为14.71°dH±0.23°dH水中的幼鱼个体大,生长速度快。表明较高硬度的水有利于七彩神仙鱼幼鱼的生长发育。  相似文献   

13.
《水生生物资源》2003,16(5):461-465
Anti-proteinase activity was demonstrated in the seminal plasma of cyprinid fish species (bream, chub, ide, dace, asp, goldfish, roach, common carp) using electrophoretic techniques combined with a detection method based on inhibition of bovine trypsin. We found species-specific protease inhibitors in the seminal plasma of cyprinids. At least three bands of protease inhibitors with different migration rates could be identified by native PAGE. Higher variability was characterized for bands with slower migration rates. Visualization of inhibitors after SDS-PAGE under non-reducing conditions allowed estimation of their molecular weights. Apparent molecular weights were within the range of 51–59 and 47–54 kDa for the bands with slower and moderate migration rates, respectively. The molecular weight of fast migration bands for roach and common carp were estimated to 23 and 30 kDa, respectively. Inhibitors of common carp seminal plasma differed in their affinity toward serine proteases. Three inhibitors in common carp seminal plasma could be visualized using cod and bovine trypsin, but only two inhibitors (of high molecular weight) were recognized with chymotrypsin. There were differences in anti-proteinase activity and seminal plasma protein concentration in relation to the origin of common carp seminal plasma (breeding lines) and time of milt collection (spawning vs. post-spawning season).  相似文献   

14.
牙鲆刺激隐核虫病的防治   总被引:1,自引:0,他引:1  
2005年七、八月份,乐亭、滦南一带多家工厂化牙鲆养殖场发生刺激隐核虫病,此种病虫害发病急、传染快、死亡率高。发生过该病的养殖场牙鲆死亡率一般都在50%~80%之间,这种病害给牙鲆养殖业带来很大损失。  相似文献   

15.
猪的胎盘属于弥散型胎盘,这种胎盘的结构特点和饲养管理的不当,常常导致母猪胎衣不下发生,给生猪的生产繁殖带来极大损失。本文针对母猪胎衣不下发生病因、综合防治进行详细阐述,旨在对预防和治疗胎衣不下能有所帮助。  相似文献   

16.
近几年.在唐山沿海发生的渔船海难、海损事故经统计表明呈增多趋势。这与出海作业渔民的安全意识不强有很大关系.渔民为了挣取更多的效益,在海上,超抗风浪等级作业且人为地增加船的不规范载荷.造成船的储备浮力损失,酿成恶果。笔者认为.在渔船设计建造中,留取的干舷对渔船作业的安全性起相当重要的作用,必不可少。 一、储备浮力的重要性 所谓储备浮力就是自船舶设计水线至水密甲板的水密部分体积,其大小与干舷相关.于舷大则储备浮力大,干舷的重要性就在于能够使船在海中保持正常的浮性和安全。再者,在设计建造渔船时,为了改善…  相似文献   

17.
七种甲壳类水产品脂肪酸组成的分析研究   总被引:5,自引:0,他引:5  
水产动物食品中富含ω—3型多稀酸,其中尤其是C_(20:5)(EPA)和C_(22:6)(DHA)对人体有特殊保健功能。本文对七种常见的甲壳类水产品进行脂肪酸组成分析,它们是中国对虾、日本沼虾、安氏白虾、克氏原螫虾、葛氏长臂虾、中华绒螯蟹和三寺疣梭子蟹。测定主要采用黄志斌、李淡秋(1990)的“快速制备脂肪酸甲酯用于气相色谱分析”一文所提供的方法。结果显示,被测样品中不饱和脂肪酸含量高于饱和脂肪酸,而不饱和脂肪酸中多烯酸含量高达60%,且以长碳链(C_(20)、C_(22))ω—3型为特征,表明甲壳类水产品体脂中EPA和DHA含量甚高,超过淡水鱼的一倍,但略逊于海水鱼。值得注意的是,甲壳类水产品中EPA的含量高于DHA的含量,这与鱼类中的情况正好相反。  相似文献   

18.
三种群银鲫形态特征的比较研究   总被引:1,自引:0,他引:1  
滁州鲫体色较浅,背部青灰色,腹部银白色。各鳍条颜色灰白,略带黄色。体厚,背高,体型侧扁,头短小。脊椎骨4+26~28,侧线鳞28~30。背鳍不分枝鳍条4根。雄性个体胸鳍末端可达腹鳍基部,雌鱼不达腹鳍基部。上述形态特征均有别于方正银鲫及彭泽鲫。  相似文献   

19.
鳟鱼发眼卵和旨种运输是养鳟生产的重要环节。发眼卵多在冬季和早春运输,苗种多在晚春和夏季运输。苗种运输大多以鱼篓充氧进行短距离汽车运输,长途运输冷水性鱼苗种的实例很少。本文总结了金鳟和虹鳟苗种长途运输方法,以期与养鳟业界共同交流提高。一、包装材料和方法内包装材料是苗种运输专用塑料袋,规格54×104cm,外包装是泡沫塑料箱,规格63.5×45.5×30.5cm,纸箱规格64×46×32.5cm。塑料袋采取双层式,内装苗种和水共12.5kg,其中苗种0.5-1.3kg,100-2000尾。起运前苗种停食1-2天。运鱼用水水温调至6℃,鱼、水入袋后袋内…  相似文献   

20.
该研究通过肉眼观察、镜检,进行干露、饥饿、盐度突降、福尔马林等抗性试验,并采用病毒检测等方法,以期建立评估斑节对虾(Penaeus monodon)虾苗活力和质量标准。结果表明,斑节对虾健康虾苗具有趋光性、集群性,体表光洁,肌肉透亮,肠胃食物充盈等特性。测试虾苗干露时间以15min为宜,健康虾苗干露后能立即恢复活力,而病弱虾苗多出现死亡、昏迷现象;虾苗的成活率随饥饿时间的延长而降低,随福尔马林浓度升高和时间延长而降低,随盐度突降幅度增加而降低。健康虾苗能忍受100~200μL·L^-1福尔马林溶液30min,成活率近100%;在盐度20~30下虾苗的成活情况较好,而其在淡水中仅能存活1h。对虾苗进行病毒检测,可以避免养殖中因虾苗携带病毒而可能导致的病毒性疾病的暴发。  相似文献   

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