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青蛤工厂化育苗生产性试验 总被引:6,自引:4,他引:2
2002年和2003年在浙江省乐清市东财育苗厂和江苏省金桥盐业公司东山育苗厂分别进行了青蛤工厂化育苗生产性试验。结果表明,促熟培养成熟的亲贝和自然发育成熟的亲贝,经过5h阴干、遮光充气3~5h的诱导催产,在水温26~29℃、比重1.017~1.023、pH值8.1~8.5条件下,催产成功率达100%,受精率90%左右。受精卵25~36个/ml,孵化率在85~96%;D形幼虫培养密度7~11个/ml,5~6d全部附着变态。用300目筛绢过滤海泥,沉淀池底2mm,附着率80%左右。东财育苗厂2002年3~10月,在1000m~3水体中,培育出4~300×10~4粒/kg稚贝2618kg,其中1.0~3.0×10~6粒/kg稚贝796.50kg,平均单位出苗量0.248kg/m~2,4~100×10~4粒/kg稚贝1821.50kg,平均单位出苗量0.495kg/m~2;2003年7~10月,在1000m~3水体中,培育出1.4~20×10~5粒/kg稚贝1260kg,平均单位出苗量1.5kg/m~2,小个体的单位育苗量0.25kg/m~2,大个体的单位育苗量2kg/m~2左右。东山育苗厂,2002年7~8月在45m~3水体中,培育出7.4~40×10~5粒/kg稚贝47.8kg,平均单位出苗量1.59kg/m~2;2003年6~7月,在231m~3水体中,培育出4.0~50×10~5粒/kg稚贝72kg,3.0×10~7粒/kg幼苗22kg,共出苗94kg,单位出苗量在0.29~0.47kg/m~2。 相似文献
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皱肋文蛤人工育苗技术的研究 总被引:2,自引:0,他引:2
笔者于2010年5月~9月对皱肋文蛤(Meretrix lyrata)人工育苗技术进行了研究。试验结果表明,以底播埋养+投喂生态饵料+鸡蛋黄组合培育亲贝,促熟效果最好,亲贝生殖腺覆盖率达80%以上的个体占90.5%;采用阴干3 h+升温4℃刺激对亲贝进行诱导催产,效果最佳,受精率和孵化率分别可达89.7%和92.3%;浮游幼虫在3个室外池中培养7 d后,幼虫进入变态期,平衡囊大而明显,足部活动频繁,平均壳长和壳高分别达176.2μm和165.4μm,幼虫平均壳长和壳高生长速度分别为8.34μm.d-1和8.77μm.d-1;幼虫附着基以细沙采苗效果最佳,附着变态成为稚贝的时间约3 d,附苗率达78.2%;经过32 d的培育,在3个25 m2的水池中共培育稚贝1 293.6×104粒,平均壳长和壳高分别为790μm和758μm,平均壳长和壳高生长速度分别为17.63μm.d-1和17.19μm.d-1,平均稚贝育成率为61.6%。 相似文献
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青蛤土池人工育苗试验 总被引:1,自引:0,他引:1
<正> 为了获得低价的青蛤苗种进行滩涂增殖,1998年7月至1999年6月,利用新建土池进行了青蛤人工育苗试验,在0.47hm~2土池中进行了亲贝暂养,诱导产卵、受精孵化、浮游幼虫培育、稚贝附着及洗苗移养试验。越冬前获得2—8mm稚贝454万粒/0.067hm~2。越冬后稚贝成活81.4万粒/0.067km~2,实验证明,在北方地区用土地进行青蛤育苗是完全可行的。 相似文献
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为提高毛蚶(Scapharca subcrenata)人工育苗技术,在滨州无棣沿海开展毛蚶人工育苗试验,摸索出了适合本地区的毛蚶亲贝培育、催产孵化、幼体培育和稚贝培育的技术方法。采自滨州海区的毛蚶亲贝经过一个月的培育,95%个体性腺发育成熟,经过阴干流水刺激后自然产卵,在水温25.0~28.0℃的条件下,孵化率90%以上,毛蚶幼体18 d左右平均壳长320μm,进入变态附着期。附着阶段采用海泥作为附着基,附着效果好,附着变态率在50%以上,稚贝最适生存盐度为20‰~35‰。育苗试验共获得毛蚶稚贝5 980万粒。 相似文献
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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
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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
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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
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《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
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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
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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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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
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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