斑鳜鱼苗对6种常见药物的忍受力实验

用敌百虫、硝酸亚汞、孔雀石绿、硫酸铜和硫酸亚铁合剂、漂白粉、食盐6种药物对斑鳜鱼苗进行毒性实验。测得6种药物在水温21~22℃时对平均全长为(1.0±0.1)cm的斑鳜鱼苗的安全浓度依次分别为0.058、0.046、0.073、0.32和1.747 mg/L。斑鳜鱼苗对敌百虫等6种药物的敏感性与一般养殖鱼类不尽相同,根据已求安全浓度与常见遍洒剂量相比较,得出斑鳜鱼苗对6种药物的敏感性大小依次为:硝酸亚汞>敌百虫>孔雀石绿>硫酸铜合剂>漂白粉>食盐。     

南方大口鲶鱼病防治技术

<正> 南方大口鲶以其生长快、产量高、质优效益好而成为水产养殖优良品种之一。它抗病力强,在天然条件下生长增殖和人工粗养情况下,一般不会患病,但在高密度精养过程中,也会发生鱼病。笔者根据有关资料和养殖大口鲶防治实践,现将南方大口鲶几种常见病的防治方法介绍如下,供养殖户参考。1 病毒性出血病 病症及危害:病鱼的上下颌、口腔、眼眶、鳃盖充血,眼球突出,鳃丝、鳍梢腐烂,体表及     

7种常用药物对南方大口鲶的急性毒性研究

在常温静水的条件下,用生物毒性试验方法进行硝酸亚汞、孔雀石绿、强氯精、高锰酸钾、硫酸铜、敌百虫、甲醛对南方大口鲶（３～４ｃｍ）的急性毒性试验,结果表明,７种药物的安全浓度分别为００００８、００１１、０１４７、０５９、２４５、４１０、１５２３ｍｇ／Ｌ;强氯精、硫酸铜、敌百虫、甲醛为较理想的药物。     

南方大口鲶鱼种网箱二级培育技术

二级培育是将全长3厘米的鱼苗培育成10厘米左右的鱼种。因体长10厘米以上的鱼苗套养或主养成活率较高,所以在网箱中进行二级培育非常必要。1.养殖水域的选择和网箱设置选择水质良好的湖泊或面积较大且底质硬而平坦的池塘作为养殖水体,要求水深在2米以上为宜。网箱规格一般为2米     

“克虫王”对大口鲶鱼苗的急性毒性试验

为了验证新药“克虫王”在水产养殖中对鱼类的毒性,选用“克虫王”两种剂型渔用杀虫剂对大口鲶鱼苗进行了急性毒性试验。试验结果表明:B_2型“克虫王”对全长4.9cm大口鲶鱼苗的24h、48h、72h半致死浓度(TLm)分别为1.20×10~(-6)、0.88×10~(-6)、048×10~(-6),安全浓度为0.14×10~(-6)。C型“克虫王”对大日鲶鱼苗的24h、48h、72h半致死浓度(TLm)分别为4.65×10~(-6)、3.60×10~(-6)、1.15×10~(-6),安全浓度为0.64×10~(-6)。     

东北地区当年养成食用南方大口鲶鱼技术

南方大口鲶鱼属鲤形目,外形与鲶鱼相似,在长江流域因其生长速度快、个体大、肉质鲜美,深受饲养者与消费者的欢迎。2004年,锦州市海洋与渔业科学研究所首次进行南方大口鲶鱼与本地土鲶鱼杂交试验,并繁殖成功,获得了锦州市科技攻关一等奖。为了推广南方大口鲶的养殖技术,攻克北方地区因气候原因而造成的饲养周期短的难题,我     

微流水高密度培育大口鲶鱼种试验

大口鲶生长快、产量高、肉质好,已成为我国池塘套养和水库网箱养鱼的重要对象之一。目前,大规格鱼种的缺乏,已成为推广大口鲶养殖的一个制约因素。我们于１９９８年５月在湖北省荆州市张家山渔场进行了微流水高密度培育大规格大口鲶鱼种试验,取得了良好的效果。１试验...     

6种常用药物对美国大口胭脂鱼的急性毒性研究

在控温24－25℃、静水条件下，用生物毒性试验方法进行敌百虫、高效消毒灵、孔雀石绿、高锰酸钾、硫酸铜、亚甲基兰对美国大口胭脂鱼的急性毒性试验，6种经物的安全浓度分别为1．6、0．163、0．016、0．176、0．45、3．78mg/L；其中孔雀石绿不宜作为防治美国大口胭脂鱼病的药物，其它5种为较理想药物。     

鲢鱼苗对一些常用药物的敏感性试验

摘要通过试验确定了3种药物对鳃鱼苗的最低致死浓度范围,半致死浓度和安全浓度。试验中其它8种药物对鳃鱼苗不敏感。鱼苗对3种药物的敏感性大小依次为富渔虫灭〉立效清〉车轮速灭。     

五种药物对梭鱼鱼种的急性毒性试验

为研究聚维酮碘、高锰酸钾、二溴海因、敌百虫和硫酸铜硫酸亚铁合剂(5∶2)等5种常用水产药物对梭鱼夏花鱼种的急性毒性效应,采用等对数间距法对每种药物均设置6个浓度组,每组设3个重复,同时设1个对照组,在静水条件下进行了急性毒性试验.结果表明:这5种药物对梭鱼夏花鱼种的安全浓度分别为4.7、0.24、0.55、0.13、0.47 mg/L,其毒性强弱依次为:敌百虫＞高锰酸钾＞硫酸铜硫酸亚铁合剂＞二溴海因＞聚维酮碘.除敌百虫外,其余4种药物都可按常规浓度在梭鱼的苗种培育过程中安全使用.     

黄颡鱼苗对3种渔药的耐受力试验

24～26 ℃静水条件下, 用生物毒性试验方法就3种常用药物对体长1～2 cm的黄颡鱼苗进行急性毒性试验.结果表明,黄颡鱼苗对硫酸铜+硫酸亚铁合剂、次氯酸钠及亚甲蓝的安全质量浓度分别为0.72、1.23、6.81 mg/L,黄颡鱼苗对这3种药物的敏感性依次为硫酸铜+硫酸亚铁合剂＞次氯酸钠＞亚甲蓝.     

Delayed Feeding of Channel Catfish Fry Stocked in Ponds

We compared production variables between channel catfish, Ictalurus punctatus, nursery ponds fed according to industry standards, that is feeding immediately at stocking, to an alternative practice of delaying feeding for 6 wk after stocking in an effort to utilize natural pond productivity and reduce feed use. Twelve 0.04 ha ponds were fertilized and stocked with swim‐up fry (4–5 d posthatch) at a rate of 10,000/pond (250,000/ha). Ponds were then randomly assigned to either the standard feeding protocol (feeding daily starting immediately at stocking) or an alternative feeding protocol (no feeding until 6 wk post‐stocking). After 18 wk of production, there were no differences in water quality or zooplankton abundance between the two treatments. Fish length was not affected by treatment throughout the study, and survival and total weight harvested were similar. Total kg of feed fed was significantly reduced in the delayed feed treatment, averaging 26 kg/pond less feed fed. If proper fertilization practices are implemented, large numbers of desirable zooplankton for catfish fry culture are attained, and these zooplankton are able to sustain catfish fry stocked up to 250,000/ha. Therefore, no commercial diets are required during the first 6 wk of culture, saving over $95.55/ha in initial feed costs.     

Evaluation of Three Feeds for Hatchery Rearing Channel Catfish Fry

Two 7 day feeding trials were conducted with channel catfish swim-up fry to evaluate growth, feed conversion ratio, and body composition of fish fed one of the following feeds: salmon starter, catfish starter, or trout starter. Fish fed the salmon or trout starter feeds gained 50–75% more weight, converted feed more efficiently, and had higher body fat stores than fish fed the catfish starter feed. This may be related to the higher protein and energy content of these two feeds. It may be advantageous to feed salmonid starter feeds to hatchery reared catfish fry; however, it is not known whether or not the improved performance observed in the hatchery continues once the fish are stocked into nursery and grow out ponds.     

长薄鳅苗种培育技术总结

长薄鳅一般在晚上摄食，仔稚鱼期沿池壁四周分布，以后有钻洞行为，苗种阶段以浮游动物为食，日粮平均为5．08％，铒产系数14．18，不同阶段的体重日增重率分别为9．147％，2．006％，1．337％，苗种培育总成活率30．9％。     

池塘培育黄颡鱼夏花技术

黄颡鱼营养价值高,生长速度快,适应环境和抗病能力强,容易饲养,市场需求量大,作为新的淡水优良养殖品种正被广大渔民认可,市场前景广阔。目前黄颡鱼夏花培育大都以水泥池（25～40m^2/口）为主,水体小,对设施、技术要求高,很多黄颡鱼生产场家由于缺乏相应的配套设备和成熟技术,夏花培育出塘率极低,有的甚至全军覆没,造成近几年黄颡鱼夏花鱼种紧俏,价格居高不下。完善黄颡鱼夏花培育技术,尤其是池塘培育技术,对于大规模开展黄颡鱼养殖具有重要意义。     

白氏文昌鱼幼鱼对海水温度和盐度变化的耐受力研究

研究了厦门海区白氏文昌鱼幼鱼对温度和盐度渐变、骤变的耐受力以及承受低水温后的恢复能力.实验结果显示:(1)14.5～34.0℃是白氏文昌鱼幼鱼生存的安全水温范围,在此水温范围内,无论渐变还是骤变均无碍其生存;白氏文昌鱼幼鱼生存的临界低水温为14.5～13.0℃,而其临界高水温则为34.0～35.5℃;白氏文昌鱼幼鱼对短时间的低水温有较强的耐受力.(2)16.0～31.0是白氏文昌鱼幼鱼生存的安全盐度范围,在此盐度范围内,无论渐变还是骤变均无碍其生存.(3)白氏文昌鱼幼鱼对海水盐度的渐变有较强的耐受力.在渐变条件下,白氏文昌鱼幼鱼可以耐受的临界低盐度为10～7,而其临界高盐度为34～37.     

丁(鱼岁)对几种药物的敏感性研究

用硫酸铜、高锰酸钾、强氯精、敌百虫对丁（鱼岁）进行药物毒性敏感性试验。结果表明：丁（鱼岁）对硫酸铜、高锰酸钾、强氯精、敌百虫的敏感顺序为：硫酸铜＞高锰酸钾＞强氯精＞敌百虫，安全浓度分别是：0．32mg／L、0．64mg／L、1．05rng／L，丁（鱼岁）对敌百虫敏感性不强。     

天津地区养殖南方大口鲶常见病记述

记述了天津地区在养殖南方大口鲶过程中10种常见病及其防治方法，包括肠炎病、烂鳃病、赤皮病、腐皮病、白皮病、水霉病、小瓜虫病、车轮虫病、指环虫病、三代虫病和气泡病、感冒等。     

Effects of Stocking Sac-Fry and Hatchery-Fed Fry on Production of Fingerling Channel Catfish Ictalurus punctatus

Abstract.— Channel catfish Ictalurus punctatus fry are typically held under hatchery conditions for 7 to 14 d after hatching to allow feeding and growth before they are stocked into nursery ponds to produce fingerling catfish. In an attempt to reduce hatchery operating costs, several catfish fingerling producers in Louisiana presently stock fry within 2 d after hatching before yolk absorption is complete. Fry at this stage of development are commonly referred to as "sac-fry." Although research has shown that fry can be stocked at the onset of yolk absorption with no detrimental effects on subsequent fingerling production, stocking sac-fry has been reported to result in reduced fingerling survival. To further investigate this topic, production trials were conducted in experimental outdoor pools over the course of two growing seasons to evaluate the effect of stocking fry of three different ages (2-, 7-, and 14-d post-hatch, DPH) on survival, growth (weight and length), condition factor (K), yield, feed consumption, and feed conversion ratio (FCR) of fingerling catfish. Results from both trials indicated that the age at which fry were stocked had no effect on production characteristics with the exception of growth. Specifically, fingerlings reared from fry stocked at 2 and 7 DPH were significantly larger than fingerlings reared from fry stocked at an age of 14 DPH. These findings suggest that the practice of stocking sac-fry may be a suitable alternative to the traditional procedure of holding and feeding fry under hatchery conditions prior to stocking. However, in order to fully evaluate the effects of early-age stocking of catfish fry on fingerling production, additional studies must be conducted under pond conditions. Furthermore, these studies must be coupled with a rigorous economic analysis before the practice of stocking sac-fry can be recommended to the catfish industry.     

大口鲶池塘养殖试验初报

利用当年繁殖的大规格鱼种,以不同规格及密度进行大口鲶池塘单养试验,并对饲料配制及投饲方面作了新的探索。经过3个月的饲养,平均体重分别达到443、670.7、211.6g/尾,成活率分别为99.1、99.0、98.6％,平均饲料系数分别为3.2、2.9、3.6:1,日总平均增重分别为3.8、5.1、1.8g/尾·天。