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正鲇形目鱼包含35个科。其中斑点叉尾(Ietalurus punetaus)、黄颡鱼(Pelteobagrus fulvidraco)、长吻(Leiocassis longirostris)、斑鳠(Mystus guttatus)、胡子鲇(Clarias fuscus)等品种肉质鲜美、营养丰富,是我国重要的淡水经济鱼类,深受广大消费者的青睐。鲇形目鱼类的市场需求持续增加,养殖规模也不断扩大。有关鲇形目鱼幼鱼、成鱼等营养饲料方面的研究报道较多,但其亲鱼和仔稚鱼营养素需求及配合饲料研究相对滞后。 相似文献
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本文选择COI基因片段作为分子标记,对部分鲇形目鱼类(Siluriformes)进行系统发育研究。应用通用引物PCR扩增得到13种鲇形目鱼类的134条COI基因,并与Gen Bank中获得15种鲇形目鱼类的51条COI基因进行比对分析。结果显示:鲇形目鱼类COΙ基因存在碱基插入缺失现象较少,为越南隐鳍鲇(Pterocryptis cochinchinensis)、丝尾鳠(Hemibagrus wyckioides)和黄颡鱼(Pelteobagrus fulvidraco)3种共计5个位点;平均碱基含量A+T(55.5%)显著高于G+C(44.5%)。利用Kimura’s 2-parameter计算28个物种的种间平均遗传距离为0.195,23个物种的种内平均遗传距离为0.006。系统发育树的分析结果表明,Neighbour-Joining(NJ)树较Maximum Likelihood(ML)树更为适合鲇形目鱼类的遗传发育分析;COI基因在科及其以下水平的系统进化关系与传统分类方法所认同的结果一致性较高,达到82.9%以上;在目水平的一致性的可信度较低,仅为71%;半鲿属聚为单系类群,黄颡鱼属、属和拟鲿属三者聚为一支,黄颡鱼属与拟鲿属的亲缘关系较近。 相似文献
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为研究兰州鲇G-SSR和EST-SSR在鲇形目和鲤形目鱼类中的通用性,以12种不同鱼类为试验材料,分别采用改进的酚-氯仿法结合DNA产物纯化试剂盒法、传统酚-氯仿法、试剂盒法提取其尾鳍基因组DNA,对提取的DNA进行琼脂糖凝胶电泳、紫外分光光度计检测。结果表明,改进的酚-氯仿法结合DNA产物纯化试剂盒法提取的鱼类基因组DNA在纯度和稳定性方面明显优于传统酚-氯仿法、试剂盒法,且电泳条带清晰、整齐、明亮,操作简单,耗时短,便于快速、批量提取。利用兰州鲇14对G-SSR引物和21对EST-SSR引物在12种鱼类中进行跨目通用性分析,结果显示,兰州鲇G-SSR和EST-SSR在鲇形目、鲤形目鱼类的通用率分别为63.10%、32.14%和61.11%、44.44%,表明随着物种间亲缘关系变远,其通用性随之降低。 相似文献
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Symbiotic supplementation on the hemato‐immunological parameters and survival of the hybrid surubim after challenge with Aeromonas hydrophila 
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下载免费PDF全文 J.L.P. Mouriño F.N. Vieira A. Jatobá B.C. Silva G.V. Pereira G.F.A. Jesus T.T. Ushizima W.Q. Seiffert M.L. Martins 《Aquaculture Nutrition》2017,23(2):276-284
This study evaluated the effects of dietary supplementation with two symbiotics in the hybrid surubim (Pseudoplatystoma corruscans × P. reticulatum) prior to and after challenge with Aeromonas hydrophila. The fish were divided into unsupplemented fish, supplemented fish with Weissella cibaria and inulin, and supplemented fish with Lactobacillus plantarum and inulin. Twenty days after being fed symbiotics, the fish were sampled for immunological, haematological, and microbiological analysis pre‐challenge. After this period, they were challenged with Aeromonas hydrophila, and after 96 h the fish were sampled for blood collection and survival. Fish fed W. cibaria and inulin from the pre‐challenge showed the highest values of lysozyme activity. Fish fed L. plantarum and inulin presented a higher number of thrombocytes and granular leukocyte PAS+ than the other fish. After challenge, fish fed both symbiotics presented an increased red blood cells number. Fish fed L. plantarum and inulin showed an increased total leucocyte count (WBC), neutrophils, and monocytes number as well as total immunoglobulin. The W. cibaria‐ and inulin‐supplemented fish showed improved haematological and immunological parameters and reduced cumulative mortality after the challenge. 相似文献
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Anurak Khieokhajonkhet Sunisa Klongchai Orrawan Maphum Gen Kaneko 《Aquaculture Research》2019,50(4):1348-1360
Lipid distribution pattern is an important trait, which is related to flesh quality and the yield rate of aquaculture products. Here we investigated lipid distribution patterns by oil red O staining for nine economically important fish in Thailand. The most remarkable feature was that Siluriformes species had a thick layer of subcutaneous lipids, possibly to compensate the evolutionary loss of scales. In addition, we found several other characteristic staining patterns: (1) dotted stains at the boundary of red and white muscles and along the subcutaneous tissue in crystal‐eyed catfish, (2) double lines of staining along the subcutaneous layer in crystal‐eyed catfish, (3) dotted stains along the horizontal septum lines in hybrid catfish, (4) pronounced retroperitoneal fat accumulation in Nile tilapia and red tilapia, (5) pronounced fat accumulation in the inclinator muscle of the fins in Indian spiny turbot, (6) intense staining under the scales of common carp and (7) three dotted stains in soft finrays in clown knifefish. Although lipid distribution patterns are known to be affected by environmental conditions, the observed species differences suggest the strong genetic control of lipid distribution. This trait should be considered as a target of selective breeding especially for Siluriformes, in addition to commonly used parameters such as growth rate and disease resistance. 相似文献
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4种鲇形目鱼消化系统蛋白水解酶 总被引：1，自引：0，他引：1
采用聚丙烯酰胺凝胶电泳法对4种鲇形目鱼——鲇[Silurus asotus(Linnaeus)]、怀头鲇(Silurus soldatovi Nikolsky et Soin)、乌苏里拟鲿[Pseudobagrasuss uriensis(Dybowski)]、黄颡鱼[(Pelteobagrus fulvidraco(Richardson)]的消化系统蛋白水解酶的种类和活性进行了检测,并比较了4种鱼消化系统各组织器官在不同pH条件下蛋白水解酶的分布和活性差异:4种鲇形目鱼蛋白水解酶的表达具有组织器官特异性,胃和前肠的蛋白水解酶活性最强;4种鲇形目鱼蛋白水解酶的表达有科属差异,同科鱼中存在分子量相同的蛋白水解酶,而不同科鱼中未见分子量相同的蛋白水解酶;怀头鲇消化系统蛋白水解酶的种类最多,活性最强;4种鲇形目鱼消化系统蛋白水解酶均表现出明显的pH依赖性。 相似文献