方斑东风螺肉壳分离病病因的初步研究   总被引：1，自引：0，他引：1  

王建钢  乔振国 《现代渔业信息》2011,26(10):16-18

螺肉与螺壳分离病是方斑东风螺养殖中的常见病害,主要发生在壳高0．5cm以下的稚、幼螺阶段,严重时可造成螺苗在短时间内大量死亡。本文报道了方斑东风螺中间培育过程中由于养殖水体中混入以婆罗异剑水蚤（Apocyclops borneoensis）为主的桡足类对稚、幼螺的攻击,导致稚、幼螺受伤部位发生溃疡性病变,进而诱发稚、幼螺肉壳分离疾病发生的镜检检查结果。通过采取杀灭螺池中桡足类的措施后,病情很快得到控制,研究结果验证了桡足类对方斑东风螺稚、幼螺的危害性。  相似文献   

鞍带石斑鱼仔稚（幼）鱼的发育和生长研究   总被引：7，自引：0，他引：7  

郭仁湘  符书源  杨薇  陈国华  骆剑  刘扬潮  周先雄 《水产养殖》2011,32(4):8-13

对鞍带石斑鱼的仔稚幼鱼形态发育的各个阶段进行了观察与研究,详细描述从初孵仔鱼到幼鱼各个发育时期的形态特征和发育时间。根据卵黄囊的变化,长鳍棘的长出与收缩,鳞片和体色斑纹的出现,鞍带石斑鱼胚后发育可以划分为仔鱼期、稚鱼期、幼鱼期。仔鱼期又可分为卵黄囊期仔鱼和后期仔鱼。水温27～30℃,盐度27～31,pH值8.0～8.4的海水中培育,初孵仔鱼至孵化后2日龄为卵黄囊期仔鱼。2日龄仔鱼开口,3日龄至20日龄为后期仔鱼,22日龄至30日龄为稚鱼期,31日龄进入幼鱼期。鞍带石斑鱼胚后发育过程中最明显的变化是背鳍棘和腹鳍棘的生长和收缩,也是生产育苗当中比较关键的仔稚幼鱼变态过程。  相似文献   

2种底栖硅藻饲养杂色鲍幼体和稚贝的饵料效果   总被引：1，自引：0，他引：1  

黄海立  杜晓东  周银环 《南方水产》2011,7(1):32-38

用羽纹藻（Pinnularia sp．）、简单双眉藻（Amprhoraexigua）、羽纹藻和简单双眉藻混合（混合组）作为饵料,以自然海区采集的硅藻作对照,研究其对杂色鲍（Haliotisdiversicolor）幼体和稚贝成活和生长的影响,确定人工分离的2种硅藻的饵料效果。结果表明,2种底栖硅藻在杂色鲍育苗中具有一定的饵料价值。饵料种类对不同规格杂色鲍的成活率和生长影响显著,并且2个观测指标的结果相同。幼体羽纹藻组、简单双眉藻、混合组3组间的成活率、生长无显著差异,但都明显比对照组低;稚贝简单双眉藻、混合组和对照组无显著差异,羽纹藻组显著比对照组低。  相似文献   

Cu~(2+)、Pb~(2+)、Cd~(2+)、Cr~(6+)对鳙胚胎和仔鱼的急性致毒效应   总被引：5，自引：0，他引：5  

叶素兰  余治平 《水产科学》2009,28(5)

研究了Cu2+、Pb2+、Cd2+、Cr6+ 4种重金属对鳙胚胎发育及仔鱼存活的影响.试验结果表明,在试验浓度范围内,除0.5、1.0 mg/L的Cd2+可促进胚胎发育速率外,其余3种重金属均不同程度地减慢胚胎孵化速率;受精卵孵化率明显低于对照组;初孵仔鱼出现不同程度的畸形;Cu2+、Pb2+、Cd2+、Cr6+对鳙仔鱼的毒性强度为Cu2+>Cd2+>Pb2+>Cr6+.根据试验数据求得4种重金属对鳙仔鱼的24、48、72、96 h的LC50值及安全质量浓度.  相似文献   

Combined effects of water temperature and daily food availability period on the growth and survival of tench (Tinca tinca) larvae          下载免费PDF全文

Jacek Wolnicki  Rafał Kamiński  Justyna Sikorska 《Aquaculture Research》2017,48(7):3809-3816

A 16‐day experiment was designed to find the best combination of water temperature (27, 30, 33°C) and daily duration of food availability (12, 18, 24 h) for larval tench (Tinca tinca) growth and survival. Larvae with an initial mean size of 5.7 mm total length (TL) and 0.7 mg wet body weight (BW) were stocked at 15 L^?1. Larvae were fed in excess with live Artemia nauplii with the period of food availability lasting 12, 18 or 24 h daily. The largest final larval size was recorded at 27 and 30°C in groups fed for 24 h a day (17.7 and 17.9 mm TL, 76.1 and 77.7 mg BW, respectively). The combination of the highest temperature and the longest daily food availability was the only set of conditions under which final larval survival was affected (95.4% survival; 98.7–99.9% under all other conditions). The combination of water temperature of about 28.6°C and continuous food availability is recommended as the optimum combination for rearing T. tinca larvae under controlled conditions. Providing continuous food supply to fish larvae under aquaculture conditions was also advantageous in helping to mitigate the effects of slower growth relative to developmental progress, which can occur at high water temperatures. However, should one wish to limit the daily feeding period to 12 h per day, the use of a water temperature between 27.4 and 27.9°C would be the best solution.  相似文献   

Design and performance of a recirculating aquaculture system for oyster larval culture          下载免费PDF全文

Tianlong Qiu  Jianfei Qi  Jimeng Zheng  Ying Liu 《Aquaculture Research》2017,48(12):5699-5706

The major objective of this study was to introduce a newly designed recirculating aquaculture system (RAS) for oyster (Crassostrea angulata) larval culture. The system includes a culture tank, a suspended circular inlet‐pipe, an upwelling aeration pipe, combined “banjo” sieves and a bioreactor chamber containing microalgae life keeping installation. The system was designed to resolve three problems: (i) stranding of larvae caused by water level changes and aeration, (ii) physical clogging of the screens and also (iii) deterioration of diet microalgae. The culture tank, “banjo” sieve size, water flow rate and light intensity for maintaining microalgae activity were all designed according to the pattern of larval movement and feeding behaviour. Results of this study showed the best average SGR for larval length was 6.36%/d (9.5 μm/d) and survival rate was 80%, with initial rearing density of 50 larvae/ml, indicating the problems above were fully resolved. Consequently, the system is fit for larval culture in mass production of oysters.  相似文献   

条石鲷胚胎及仔稚鱼的发育     

常抗美毛建平  吴剑锋张科杰 《上海海洋大学学报》2005,14(4):401-405

通过对条石鲷胚胎发育和仔鱼发育形态的观察,确定了条石鲷早期发育的进程。条石鲷的受精卵为圆球形、透明、浮性,卵径为0．90～0．95mill,油球1个,卵裂为盘状卵裂。在水温23～24℃,盐度26～28的条件下,受精后7h 10mirh胚胎发育至原肠期;受精后12h,眼囊形成;受精后20h 30min,心跳开始搏动;受精后26h 30min仔鱼孵出。初孵仔鱼全长1．78～2．03min,至5日龄全长3．25～3．30min时,卵黄囊完全消失;至8～15日龄,全长3．50～4．97mm时,鳔形成;至18．20日龄,全长7．10～7．31min时,尾鳍鳍条发育完整。  相似文献   

啶氧菌酯对意大利蜜蜂幼虫生长发育及免疫应答的影响     

段辛乐  王如意  熊曼琼  王梨竹  覃淦  黄少康  李江红 《植物保护学报》2024,51(2):432-441

为探究啶氧菌酯对意大利蜜蜂Apis mellifera ligustica幼虫生长发育和免疫应答的影响,使用田间推荐浓度（113、150、225和281 mg/L）的啶氧菌酯连续饲喂意大利蜜蜂工蜂幼虫,记录处理后工蜂幼虫的存活率、化蛹率、蛹重、羽化率和羽化初生重,并测量幼虫体内发育相关基因、营养相关基因及免疫相关基因表达情况。结果显示,不同浓度啶氧菌酯对意大利蜜蜂工蜂幼虫存活率、蛹重和羽化初生重均有显著影响,且具有显著的浓度效应;150、225和281 mg/L啶氧菌酯处理后意大利蜜蜂工蜂幼虫的化蛹率和蛹的羽化率均较对照显著下降。不同浓度啶氧菌酯均可诱导幼虫体内蜕皮激素受体（ecdysone receptor,Ecr）基因、卵黄原蛋白（vitellogenin,Vg）基因、蜜蜂防卫素（defensin 1,Def1）基因和膜翅抗菌肽（hymenoptaecin,Hym）基因的表达量上调,且大部分与对照差异显著;不同浓度啶氧菌酯均可显著抑制幼虫体内胰岛素样肽（insulin-like peptide 1,ILP1）基因的表达量;281 mg/L啶氧菌酯分别显著抑制和显著增加幼虫体内蜜蜂抗菌肽（apidaecin,Api）基因和蜂蛾抗菌肽（abaecin,Aba）基因的表达量,225 mg/L和281 mg/L啶氧菌酯可诱导幼虫体内ILP2的表达量显著上调,显著抑制幼虫体内储存蛋白（hexamerin,Hex）基因Hex70b的表达量,其他浓度处理对幼虫体内Api、Aba、ILP2和Hex70b无显著影响。表明啶氧菌酯对意大利蜜蜂工蜂幼虫有慢性毒性,长时间暴露会扰乱幼虫的生长发育和免疫应答。在生产实践中应当考虑啶氧菌酯对意大利蜜蜂的潜在风险。  相似文献   

瘤背石磺人工繁育关键技术的研究     

金春华  郑忠明  华建权  陈汉春 《水产科学》2010,29(10)

研究了瘤背石磺亲体在不同温度、盐度下受精卵的孵化及不同开口饵料、不同附着基对浮游幼虫的培育和附着效果。结果表明,不同饵料对亲体的成活率无显著影响,各组成活率均超过95%;在(27±1)℃、不换水条件下,5、10、15、20、25、30的各盐度组中,以15、20盐度组的孵化率最高,分别为96.4%、95.8%;在盐度15、不换水条件下,(24±1)(、27±1)、(30±1)、(33±1)℃温度组,受精卵产出后至孵化出膜的时间分别需319、297、2862、78 h;采用自制孵化框漂浮式孵化,孵化率高达98%;不同开口饵料试验结果表明,金藻投喂组幼体成活率最高,为87.5%;不同附着基附着培养试验10 d后,悬浮球填料组的成活率最高,达90%,且个体整齐、生长速度快,而铺泥组为43%,不加附着基组仅38%。  相似文献   

Winter monsoon promotes the transport of Japanese temperate bass Lateolabrax japonicus eggs and larvae toward the innermost part of Tango Bay,the Sea of Japan     

Keita W. Suzuki  Taiki Fuji  Akihide Kasai  Sachihiko Itoh  Shingo Kimura  Yoh Yamashita 《Fisheries Oceanography》2020,29(1):66-83

Northwesterly cold winds characteristic of the East Asian Winter Monsoon (EAWM) dictate winter climatic conditions over the Japanese Archipelago. Japanese temperate bass Lateolabrax japonicus is a commercially important coastal fish that spawns offshore in winter and uses shallow waters as nursery habitats. To investigate the effects of EAWM on the planktonic period of L. japonicus, eggs, larvae, and juveniles were quantitatively collected in Tango Bay on the Sea of Japan side in winter and spring from 2007 to 2017. Although eggs occurred close to the mouth of the bay, planktonic larvae occurred further inside as they developed. The horizontal distribution of planktonic larvae, combined with water velocity data obtained from mooring observations, indicated that planktonic larvae are transported south‐ to westward through Ekman current and an anticyclonic circulation, which are driven by northwesterly winds. To evaluate survival during the planktonic period in each year class, the abundance of benthic larvae/juveniles was divided by winter total landings of Lateolabrax spp. (proxy of the spawning stock size). This survival index exhibited a positive correlation with the northwesterly component of winter winds, and a negative correlation with winter air temperature (average from December to February, Spearman's correlation, p < .05). There was, however, no significant correlation with winter water temperature or winter freshwater discharge in the bay. We conclude that northwesterly cold winds of EAWM play a critical role in transporting L. japonicus eggs and larvae toward nursery habitats, specifically beaches and estuaries fringing the innermost part of Tango Bay.  相似文献