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1.
“杀毙王”对鱼类的急性毒理试验 总被引：3，自引：0，他引：3
“杀毙王”对鱼类的敏感性由大到小依次为花鲢、白鲢、鳊鱼、草鱼、鲤鱼。淡水白鲳，罗非鱼在０．８ｐｐｍ浓度９６ｈ存活率为１００％，“杀毙王”对白鲢冬片２４ｈ、４８ｈ、９６ｈ的ＴＬｍ分别为０．５０７０ｐｐｍ、０．５１２９ｐｐｍＴ ０．５２４８ｐｐｍ，安全浓度为０．１５ｐｐｍ。 相似文献
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<正>三、二氧化氯的作用1.对水产养殖动物的急性毒性二氧化氯对水产养殖动物的急性毒性研究涉及的品种很多，但是因为所用二氧化氯产品检测标准不同，以至于得到的结果相差很大。如二氧化氯对于体长3.3厘米的草鱼48小时的安全浓度为0.117毫克/升，而另一个研究对于孵化出膜后7天的草鱼96小时的安全浓度为8.26毫克/升；在黄颡鱼上也同样出现了近7倍的差距，而且96小时的安全浓度反而更高； 相似文献
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孔雀石绿对河蟹蚤状幼的４８小时半数致死浓度Ｉ期幼体为１．８９ｐｐｍ．Ｖ期幼体为７．４５ｐｐｍ。在河蟹工厂化育苗中如果发生聚缩虫感染，可采用孔雀石绿１ｐｐｍ浓度全池泼洒，１０－１２小时内排出药液水，换入新水的方法杀灭聚缩虫，不会影响河蟹蚤状幼体的变态发育。 相似文献
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８３＿２系草鱼是湖南省水产科学研究所历时廿年选育的抗出血病等病毒性鱼病的草鱼抗病品系。早在１９７８年，我们在前几年探索的基础上，进行了兴国红鲤雌鱼与草鱼雄鱼的杂交，获得了少量鱼苗；１９８０年再次进行这项研究，获得大量鱼苗，检查其染色体发现，为异源四倍... 相似文献
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为了探究盐酸小檗碱(berberine hydrochloride)对草鱼(Ctenopharyngodon idellus)补体c3的作用机理,用含0、0.06%、0.12%、0.24%盐酸小檗碱饲料投喂草鱼,在第7 d、14 d检测血清中补体c3含量,在第14 d检测肝脏中补体c3 mRNA表达量及急性感染嗜水气单胞菌(Aeromonas hydrophila)后存活情况。并进一步对盐酸小檗碱体内药代动力学和补体消耗试验进行了研究。结果显示;摄食盐酸小檗碱的草鱼血清中补体c3含量和肝脏补体c3 mRNA表达量均显著性增加(P0.05/P0.05),草鱼的存活率与对照组相比也有显著性提高(P0.01)。补体消耗试验结果显示,当盐酸小檗碱在血清中浓度小于5 mg/L时与对照组相比补体消耗不显著,当盐酸小檗碱浓度大于5 mg/L时,补体消耗达到显著性差异(P0.05),表明此时盐酸小檗碱与补体c3直接结合,激活补体。药代动力学实验发现,灌服盐酸小檗碱后,出现双峰现象,两峰值分别是0.243 mg/L和0.117 mg/L,此浓度远远低于与补体c3直接结合量最低量(5 mg/L)。结果表明,盐酸小檗碱对草鱼补体c3的作用机理可能是通过上调补体c3mRNA的表达增加补体c3数量,而非通过直接结合补体c3来改变其活性。 相似文献
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MS—222对幼蟹存活保护作用的初步研究 总被引：4，自引：0，他引：4
将幼蟹在１０ｐｐｍ或１００ｐｐｍ的ＭＳ──２２２药液中浸浴１０－１５分钟后，再置于同样药液湿润的环境中，可以明显延长幼蟹的存活时间，减少幼蟹发生批量死亡，经２４０小时后，幼蟹存活率比对照组高出８０％以上。 相似文献
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利用自然水温提早草鱼人工繁殖,生产早繁鱼苗使鱼种达到大规格的需要,为成鱼养殖高产创造条件。本试验从1990年到1992年连续三年由常规到早繁,出苗期由历年的6月8～9日提早到5月26～28日,催产率100%,受精率在胚胎发育至原肠后期检查达90%以上。以受精率为基数计算出苗率为80%左右,繁殖期水温20～24℃,产卵时间是第二针注射后8～10小时。鱼苗出缸时间是孵化后115～120小时。 相似文献
10.
不同浓度的光合细菌对轮虫繁殖的影响 总被引：5，自引：0，他引：5
不同浓度的光合细菌对轮虫的繁殖具有一定影响，当在一定浓度的小球藻海水中添加的光合细菌的浓度分别为：０ｐｐｍ，２００ｐｐｍ，２５０ｐｐｍ，３００ｐｐｍ时，其中２５０ｐｐｍ光合细菌对轮虫的增殖最有利，其日平均增殖率最高，达到０．８５２。 相似文献
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在草鱼(Ctenopharyngodon idellus)养殖池中进行鱼蚌综合养殖试验,以探究三角帆蚌(Hyriopsis cumingii)吊养密度和深度对水质、鱼和蚌生长的影响。试验共分4个处理组,三角帆蚌放养模式分别为对照组0只/m^3(C)、水下40 cm处单层吊养9只/m^ 3(D-6)、水下40 cm处单层吊养18只/m^3(D-12)、水下40 cm和80 cm处双层吊养18只/m^ 3(S-12)。结果显示:试验期间,各组透明度和溶氧均随时间的延长呈现下降趋势。吊养组(D-6、D-12、S-12)TN、NH+4-N和COD的平均含量均低于C组。各组TP平均含量无显著差异。吊养三角帆蚌后草鱼的成活率和增重率显著提高,其中D-12组鱼和蚌的存活率和增重率最高。同等三角帆蚌密度下,单层吊养(D-12)的水质化学指标、鱼和蚌的存活率和增重率均优于双层吊养(S-12)。从改善水质、鱼蚌生长情况等指标考虑,在草鱼养殖池中,三角帆蚌最佳吊养密度和深度分别为18只/m^3和40 cm。 相似文献
13.
Abstract. Cyprinid herpesvirus 1 (CHV) or Herpesvirus cyprini was virulent for carp, Cyprinus carpio L., fry following 1 h immersion in water at 20 °C. Cumulative mortality for carp fry was 86–97% in 2-week-old common carp, 20% in 4-week-old fancy carp, and 0% in both 8-week-old common and fancy carp. The virus did not produce mortality in fry of crucian carp, grass carp or other cyprinids. It was also oncogenic in carp, inducing papillomas to the extent of 55% among both common and fancy carp fry. The neoplasms appeared 5–6 months after carp had been exposed to the virus by immersion and recurred at an incidence of 83% in carp 7·5 months post-desquamation of the tumour. The CHV was reisolated from all moribund fish and from all survivors. It also induced papillomas at an incidence of 13% in adult mirror carp and at 10% in adult fancy carp 5 months after intraperitoneal inoculation of 105 TCID50 ml-1 fish. The virus was rcisolated only from the ncoplastic tissue and not from internal organs. The neoplasms were normally located on fin, skin or mandible, at the intraperitoneal inoculation site. Specific fluorescence for CHV antigen was frequently detected in the gills, liver, kidneys and intestine of 2-week-old fry from 3 to 21 days following challenge with CHV. It was found in greater concentrations in experimentally induced papillomata on 2-week-old carp fry survivors examined 24 weeks after challenge than in naturally occurring neoplasms. 相似文献
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为了解决冬季培育鲤鱼苗的饲料问题，从1981年冬开始，对鲤鱼苗的人工饲料进行了一系列的研究。1983年初研制成功“5号”人工开口饲料。用这种饲料直接喂养鲤鱼苗，可使其成活及正常生长。在鱼苗放养密度分别为20万尾／米。和10万尾，米^2，水中不合饵料生物的条件下，经过15天饲养，鱼苗体长分别可达到11—13毫米，体重可达15—22毫克，成活率为77—97％．5号饲料的成份为：粗蛋白36．7％，粗脂肪5．5％，粗纤维1．8％，水分8％，灰分19．0％，碳水化合物29％。 相似文献
15.
One of the bottlenecks in Israel's cold water ornamental fish industry is the large loss of fish during the post-larval stage. As a first step towards increasing survival rates, the optimal stocking density in earthen ponds for fry of each species should be determined. The results of five consecutive experiments with fry of goldfish (Carassius auratus), common carp and koi (respectively, edible and ornamental morphotypes of Cyprinus carpio) are presented here. The experiments were run in 18 cages of 1 m3 and 0.8 mm mesh size placed in a 0.02 ha earthen pond, stocked at 50,100 and 200 fry per cage. The variables analyzed were growth rate, harvesting weight, biomass and survival. Equations to estimate growth rates under different conditions are given. The three fish types present different growth rates and survival patterns in relation to stocking density and season, which lead to different management implications. Koi can be stocked up to 2 million fry per ha without showing negative density effects. Goldfish should be stocked at low density (500,000–1 million fry per ha) in spring and at higher rate (2 million fry per ha) in summer. Common carp stocking density should be adjusted to obtain the required fish size at harvest. 相似文献
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V.G. Jhingran K.L. Sehgal Kuldip Kumar B.B. Ghosh 《Aquaculture (Amsterdam, Netherlands)》1979,18(1):45-49
This paper describes an experiment using a recirculatory-filtering system operating in two rectangular cemented ponds (160 and 190 m2, 1.5 m deep) to rear fry (25 mm–50 mm) of the major Indian carp species Labeo rohita (Hamilton) and Catla catla (Hamilton) to fingerlings (100 mm–125 mm). These operations were concluded in both the species in 32 days at stocking densities of 0.46 million/ha and 0.55 million/ha, and showed survival rates of 96.6% and 84.4% respectively. In the presently followed practices of modern fish culturists, corresponding operations in earth ponds usually take 90 days and have a stocking density of 0.2 million/ha with survival rates more or less similar to those obtained in the recirculatory-filtering system. If followed by industry, the technique described will enable production of major Indian carp fingerlings with great saving in time, the use of water and the space occupied by the production system. These advantages greatly enhance the economic viability of rearing carp fingerling in India. 相似文献
17.
对无水乙醇提取草鱼内脏鱼油工艺进行了研究,并分析了鱼油的基本理化性质和脂肪酸组成,主要研究了料液比对鱼油提取率的影响。无水乙醇提取草鱼内脏鱼油的工艺为:料液比(w:v)1:8,提取温度55℃,提取时间3小时。在此工艺条件下,粗鱼油提取率为87.6%。粗鱼油经85%磷酸脱胶、4%NaOH脱酸、活性白土脱色后,鱼油呈浅黄色透明状,酸价、过氧化值较低;经冬化处理后的鱼油中不饱和脂肪酸含量约为81.5%。 相似文献
18.
Abstract. An investigation was conducted under laboratory conditions to determine the optimum food particle size of an inert diet for common carp fry ranging in size from 15 to 466mg body weight and 13 to 31 mm total length (TL). Speed of consumption of a standard quantity of food was used as a measurement of feeding preference/efficiency for different particle size ranges. It was observed that for carp of this size range preferred food particle size increases with fish size. On the basis of ingestion time and feeding behaviour, food particle sizes in the ranges 125-300μm. 300-500μm, 300-790μm and 500-1000μm diameter were found to be most appropriate for carp fry weighing 15-23mg(TL 13-18), 46-97 mg(TL 17-22), 105-209 mg (TL 20-25) and 210-466mg (TL 24-31) respectively. This study also demonstrated that for carp fry of these size ranges the mean preferred food particle sizes are about 02-04 that of mouth size. Based on this relationship, general recommendations are made on the optimum food particle sizes for different size classes of carp fry reared under hatchery and nursery conditions. 相似文献
19.
三角帆蚌钩介幼虫在5种寄主鱼体寄生效果的比较 总被引：1，自引：0，他引：1
选用黄颡鱼、草鱼、鲢、鳙和鲫作为三角帆蚌(Hyriopsis cumingii)的寄主鱼,分析了寄苗悬液钩介幼虫密度和寄苗时间对5种鱼初始寄苗量的影响,并对寄生在这5种鱼上的钩介幼虫发育情况进行了观察。结果表明:无论高密度寄苗还是低密度寄苗,长时间寄苗还是短时间寄苗,黄颡鱼和草鱼的寄苗量都明显高于鲢、鳙和鲫。提高寄苗悬液钩介幼虫密度,寄主鱼的寄苗量显著增加,但增加寄苗时间,寄主鱼的寄苗量未见显著提高。黄颡鱼和草鱼的稚蚌脱苗率显著高于鲢、鳙和鲫,寄生在鲢、鳙和鲫鳃上的钩介幼虫约80%未发育至稚蚌便提前脱落。不论在寄苗量方面,还是在稚蚌脱苗率方面,黄颡鱼和草鱼均是三角帆蚌钩介幼虫的最佳寄主。 相似文献
20.
Nirupama Chatterjee Asim K Pal Tilak Das Manush S Mohammed Kamal Sarma Gudipati Venkateshwarlu & Subhas C Mukherjee 《Aquaculture Research》2006,37(5):472-476
Glycogen content and metabolic enzyme activities viz. lactate dehydrogenase (LDH), malate dehydrogenase (MDH), aspartate amino transferase (AST) and alanine amino transferase (ALT) in Indian major carps, Labeo rohita, Catla catla and Cirrhinus mrigala, were investigated after a 6 h transportation trial to compare the species‐specific variation and the effect of increased packing density on the metabolism. Fish (45±5 mm, 0.5±0.1 g) were packed in three densities (100, 150 and 200 L?1) for the experiment, and 12 specimens of each species were randomly sampled from all the treatments at the end of transportation. The glycogen content of L. rohita ingerlings decreased significantly (P<0.05) with increasing packing density. The activities of enzymes LDH, MDH, AST and ALT showed a rising trend with increasing packing density in all the three species. Species‐specific differences were observed in various tested parameters at the lowest packing density (100 fry L?1). Alanine amino transferase and LDH activities were significantly (P<0.05) lower in C. mrigala as compared with the other two species. However, glycogen reserves and MDH activity were not significantly different (P>0.05) among the species. The present study reveals that the optimum packing density for Indian major carp fry (100 fry L?1) for transportation up to 6 h and metabolic regimes are species specific during transportation. 相似文献