鲤鱼暴发性出血病防治体会

<正> 鲤鱼是我国北方地区的主要水产养殖品种。近年来,由于颗粒饵料的普及推广,集约化养殖程度越来越高,吨鱼塘、双吨塘屡见不鲜。暴发性鱼病也日趋严重,给养殖单位造成极大损失。笔者根据多年实践经验和与有关专家探讨,将该病的发生情况及防治方法介绍如下,仅供参考。 1 发病特点 1.1 流行季节长 6月下旬至9月中旬是该病     

鲤鱼暴发性出血病防治的几点措施

近几年来，我省鲤鱼暴发性出血病发病较多，特别是绥化市北林区，因大量发生暴发性出血病，给渔业生产带来较为严重的经济损失，我们通过近几年的预防和治疗，积累了一些经验，现总结如下：     

中草药防治金鱼暴发性出血病

镇平县金鱼养殖业已成为当地农业结构调整的“龙头”产业，全县金鱼养殖面积已达5000多亩，从业人员3万余人，产品销往全国十几个省市和香港、台湾、新加坡等其它地区和国家。为贯彻落实《出口观赏鱼检疫管理办法》，确保金鱼销售和出口渠道的畅通，在金鱼养殖过程中，我们着重进行了无公害、低残留水产药物的     

云斑鮰暴发性出血病防治小结

~~5郾做好药物预防每半月至20天用药物预防一次。外泼:生石灰20克/米3、溴氯海因0郾2克/米3、氯杀灵0郾15克/米3;内服:土霉素、氟哌酸、大蒜素、三黄粉交替拌饵投喂。6郾多种药物交替使用治疗从本次治疗看,单一药物治疗很难达到理想效果,尤其对暴发性出血病,要合理选择多种药物     

鳜鱼暴发性出血病的防治

一、病原体鳜鱼暴发性出血病，主要以大型球状病毒为主，在发病过程中常伴有气单胞菌和寄生虫等。二、症状发病前塘水一般会发生突变、浑浊，池边也有鳜鱼头上尾下，不协调地旋转游动，胸腔、鳍基部及尾部出现充血，鳃丝完整，由红变白，腹腔积水，肝脏变白并伴有点状出血，脾脏增大，肠道无食，多数伴有细菌性烂鳃病、寄生虫病等（用常规消毒杀虫药会出现暂时好转，但几天后又会大量死亡，此时药物将无法控制）。三、流行情况及原因此病主要危害的鳜鱼大多数在１０厘米以上，水温２５℃左右，当水温降至２０℃时，死亡减少，目前暴发原因主…     

中西药结合防治网箱养鲤暴发性出血病

1997年,二道河乡三站村试验搞四个5×5×2．5网箱,投放鲤鱼种932公斤,平均每箱236公斤。鱼入箱后不久,发生水霉病,用孔雀石绿等消毒药物浸洗,仍不见好转,并且继续大量死亡。后仔细检查,解剖鱼体,发现是暴发性出血病。采用中西药结合方法进行防治,收到了较好效果。现将方法总结如下：一、鱼病症状从鱼体表来看,背鳍、腹鳍充血发炎,鳍条间组织破坏,形成蛀鳍,眼球突出、发白,鳃盖出现红色血丝,鳃丝暗红色,肿胀,附有粘液,腹部显著肿大,全身竖鳞、浮肿。从病鱼解剖来看,肠道和肾充血发炎,肠粘膜脱落,肠内有脓状物,无食…     

鱼类暴发性出血病防治方案

鱼类暴发性出血病是鱼类细菌性疾病，也称暴发病、出血病。1 病原目前经初步鉴定，病原体共分3个类型：（1）鲁克氏耶尔森氏菌；（2）气单胞菌；（3）河孤菌。其中气单胞菌为主要致病菌。2 症状患病早期，从外观观察，病鱼的口腔、腹部、鳃部、眼眶、鳍及鱼体两则呈充血症状。剖开腹部，肠道内尚见少量食物。随着病情的发展，上述体表充血现象加剧，出血症状明显。此外常伴有眼眶周围充血，眼球突出，腹部膨大红肿等症状。腹部明显可见内脏器官（如肝、脾、肾等）肿大受到损害，腹腔内积有黄色或红色腹水，肠道充血，充气且贫血症状，有时呈…     

两种防治鱼类暴发性出血病新药

<正> 近两年来,在我国许多淡水养鱼地区暴发了白鲫、鳊、鲢等出血病。其病情来势猛、流行面广,加之并发细菌性烂鳃、赤皮等疾病,死亡率一般在60％左右,有的几乎“全军覆没”,对养鱼业造成严重威胁。经科研人员持续研究,探索其诱发疾病因素,检测生产实例,分离病菌菌株及活体感染等结果表明,引起此病的病菌为液化产气单胞菌(Aeromoas Liqufaciens)和点状产气单胞菌(Aeromonas Punctata)。它们均属于弧菌科气单胞菌属中两种菌株,具有近似的生物学特性,革兰氏染色为阴性。暴发性出血病的主要症状表现为头部、眼眶、鳃盖及各鳍条充血,肌肉出现红色小点,称斑状出血(Ecchymoses),     

异育银鲫暴发性出血病及其防治

暴发性出血病，是近年来异育银鲫人工养殖中一种广为流行、危害较大的一种传染病。现已证实，该病的病原为嗜水气单胞菌。1 临床症状患病鱼体上浮独游，活力较差，受惊时反应迟钝，摄食量下降或停食；病鱼的口腔、上下颌、眼眶、鳃盖、鳍条皆有不同程度的充血，病灶部位呈红色或浅紫色斑状(系组织间内出血)；病情严重时，病鱼肛门红肿，鳃丝水肿，苍白(贫血)，眼球突出，腹部膨大，解剖可见肠道充血，肝、胆等脏器肿大，并伴有腹腔积水。2 发生特点该病危害对象主要是1龄以上鱼体，流行季节一般为4～10月，其中6～9月为发病盛期。在高密度、…     

鲤鱼几种出血病的防治措施

近年来,鲤鱼出血病在高产池塘中发病率逐年提高。该病治疗比较棘手,经常给养殖户造成巨大经济损失。作者对该鱼病进行了深入研究和防治试验,总结出一些经验及防治方法。1出血病类型分暴发性出血病和慢性出血病1.1暴发性出血病的症状     

无公害黄河鲤池塘养殖技术要点

黄河鲤是优良品种之一。要生产无公害黄河鲤,必须是水质符合国家规定的渔业养殖水质标准,饲料和添加剂执行国务院颁布的管理条例,病害防治时用药应使用高效、速效、毒副作用少、用量小的行业标准许可的渔药。     

Effects of feeding rates on growth and production of Nile tilapia, common carp and silver carp polycultured in fertilized ponds

Abstract In an attempt to identify appropriate feeding rates for multispecies of fish raised in fertilized earthen ponds, the present work was conducted over a 19‐week experimental period to establish the growth performance, production and body composition of Nile tilapia, common carp and silver carp fed 0.0%, 0.5%, 1.0%, 3.0%, 5.0% biomass and to apparent satiation (treatments). Twelve ponds were stocked with a similar number and weight of each fish species. Two ponds were assigned to each of the treatments, and a 25% protein pelleted fish feed was used to feed fish at the specified rate of feeding. At the end of the experiment, growth, weight gain, survival, yield and body composition of fish groups were affected by the treatments. The economic effectiveness also varied among treatments. The most conspicuous attribute of the feeding rates was its lack of influence on growth (g day^?1), weight gain (g per fish), yield (kg ha^?1) or body composition of silver carp. The results of whole‐body proximate analysis indicated that various feeding rates had either an irregular pattern or no effects on the protein and ash gain per 100 g of fish body weight (bw) gain. The most notable exceptions were significant (P < 0.05) increases in body fat and gross energy gains in Nile tilapia, common carp and silver carp accompanied by decreases in percentages of moisture (but not in silver carp) as feeding rate increased. Among the six different feeding levels, feeding to apparent satiation (feed amount was equivalent to 2.67% of fish bw day^?1) appeared to be optimal, as it significantly (P < 0.05) supported the highest fish production, income and net profit compared with all other treatments except for the 3% feeding level, for which the differences in those measurements were comparable.     

Differential impact of recombinant human activin on LH secretion in male and female common carp during wintering and spawning period

The pituitaries of male and female common carps were subjected to the treatment with recombinant human activin A. Basal LH secretion decreased in females during wintering, but stimulated basal and sGnRH-induced LH secretion during ovulatory period. It stimulated LH secretion in males during wintering, but not during spawning, suggesting sex-specific effect of activin on LH secretion in common carp.     

池塘集约化养殖日本锦鲤试验

集约化池塘养殖6个月,主养塘共产日本锦鲤2 260 kg,鲢鳙鱼种980 kg,折合单产23 143 kg/hm2,成活率为98%,锦鲤平均规格144 g/尾;混养塘中锦鲤成活率达100%,2号塘锦鲤平均规格为133 g/尾,3号塘锦鲤平均规格为200 g/尾。     

池塘养殖草鱼种关键技术研究

草鱼以其饲料来源广,肉质好,脂肪含量低,生长速度快,产量高,易于进行规模化养殖等特点,成为我国渔业生产中历史悠久的重要淡水传统养殖品种之一,与青鱼和花白鲢统称“四大家鱼”,深受广大养殖生产者和消费者的喜爱。随着社会的进步和人民生活水平的提高,人们对优质廉价的草食性     

Communal testing,a method of testing the growth of different genetic groups of common carp in earthen ponds

Communal testing consists of stocking the different genetic groups to be tested into the same (communal) pond. In this system, genetic differences between groups of fish and differences in pond productivity are not confounded, as they are in separate testing. Communal testing reduces the number of replications required and enables larger numbers of groups to be tested in a smaller number of ponds. Growth testing in communal ponds means that the testing environment and the commercial production environment in which the results of genetic investigations are to be applied are not identical. This difference is due to the mutual competitive interactions between test groups in communal ponds, which cannot occur when they are stocked separately. Interactions may be due to differences in initial weight between the groups, or to differences in competitive ability not associated with differences in initial weight. The methodological investigations which allow these sources of bias to be removed are described. The effect of differences in initial weight is corrected with the aid of the environmentally generated coefficient of regression of weight gain on initial weight in a communal pond. This regression requires empirical estimation in each test, by the multiple nursing technique, specifically constructed for this purpose. Relative growth rankings of paris of test progenies were identical when each group was stocked separately into a series of replicated ponds and when both were stocked together into communal ponds. Thus growth estimates from communal testing are reliable predictors of expected genetic differences in separate ponds.Communal testing allows any pond or other growth vessel to be used as a testing facility, irrespective of its area or aquacultural management. Alternatively, it enables breeding studies to be integrated with other unrelated investigations. This results in a more rational utilization of facilities and the possibility of isolating and estimating interactions between experimental variables.     

鲫鱼鳃出血防控

盐城是鲫鱼养殖的主要地区之一,素有全国鲫鱼看江苏,江苏鲫鱼看盐城一说。但是,多年的鲫鱼养殖,导致鲫鱼病害严重,尤其是鲫鱼鳃出血,给盐城鲫鱼养殖造成重大损失,严重制约了盐城地区鲫鱼养殖的发展。鲫鱼鳃出血的病原是鲤疱疹病毒Ⅱ型,该病毒只危害鲫鱼及其变种,对池塘中的其他鱼类也具有感染性,但无致病性。携带病毒的鲫鱼早期无明显症状,病毒可以长期潜伏在鲫鱼体内.     

The effect of stocking different ratios of common carp, Cyprinus carpio L., and tilapias in polyculture ponds on production characteristics and profitability

Production characteristics and profitability of three carp-tilapia stocking ratios (1:1, 1:2 and 1:5) were compared in a semi-intensive polyculture system. The. experiment was carried out at the same total stocking density of 1 fish m², in nine 1000-m² earthen ponds. Common carp, Cyprinus carpio L., and a tilapia hybrid, Oreochromis niloticus (L.) x 0. aureus (Steindachner), were stocked at a joint density of 900 fish per pond, while grass carp, Ctenopharyngodon idella (Cuvier & Valenciennes), and silver carp, Hypophthalmichthys molitrix (Valenciennes), were each stocked at 50 fish per pond in all treatments. Mean harvested weights of both common carp and the tilapia hybrid were markedly decreased upon the increase in density of their own species. Survival of all four species was over 80% in all three carp-tilapia stocking ratios. The differences in relative profitability of the three carp-tilapia stocking ratios did not exceed 10% on the basis of 1991 prices. However, based on 1994 prices, relative profitability of the 1:2, and particularly, the 1:5 carp-tilapia stocking ratio were 35% and 41% higher than the 1:1 ratio, respectively. This was because of the increase in the price of large carp and tilapia of all sizes, and a decreases in the price of small carp.     

池塘养殖中提高草鱼种成活率的关键技术

池塘主养草鱼是近几年池塘养鱼的主要养殖模式。草鱼具有喜清水,对溶氧要求高,贪食暴长,易发病,死亡率高等特点,加之养殖户养殖技术不规范,导致养殖风险增大,特别是在富营养化的池塘中,成