宁夏鲇属鱼类一新纪录种——兰州鲇形态学特征描述   总被引：3，自引：1，他引：3  

吴旭东  张奇  赵红雪  侯玉霞  张文吉 《淡水渔业》2006,36(3):26-29

2003年3月至2004年5月,在黄河宁夏段采集到一批鲇鱼标本。经鉴定,为鲇属(Silurus)宁夏一新纪录种———兰州鲇(Silurus lanzhouensis)。兰州鲇(S.lanzhouensis)与小背鳍鲇(S.m icrodorsalis)、鲇(S.asotus)、大口鲇(S.m eridionalis)、昆明鲇(S.m ento)、抚仙鲇(S.graham i)相似,但也有显著区别。兰州鲇犁骨齿带左右分离,与小背鳍鲇、鲇、大口鲇犁骨齿带连续相区别;兰州鲇臀鳍鳍条77-86、脊椎骨数目63-68,可与昆明鲇臀鳍鳍条61-72、脊椎骨52-56,抚仙鲇臀鳍鳍条68-74、脊椎骨58-59相区别。此外,兰州鲇卵色为黄色,可作为与黄河中生活的鲇相区别的鉴别特征之一。  相似文献   

池塘主养土鲶高产试验     

刘义新  白禄军 《河北渔业》2007,(7):39-39,56

0.4hm2池塘放养规格为5.0cm的土鲶(Silurus asotus)夏花鱼苗,密度4.5万尾/hm2。经92d饲养,平均规格405g;产量11 846.25kg/hm2;饵料系数3.50;利润8.0万元;投入产出比1∶2.47;出塘率65.0%。  相似文献   

Effect of dietary composition on specific dynamic action in southern catfish Silurus meridionalis Chen     

Shi-Jian Fu  Xiao-Jun Xie  & Zhen-Dong Cao 《Aquaculture Research》2005,36(14):1384-1390

The effect of dietary macronutrient composition on specific dynamic action (SDA) in southern catfish Silurus meridionalis Chen juveniles (39.0±2.8 g) was studied. A control diet (40% protein, 10% lipid and 15% carbohydrate) was the optimal dietary profile for growth in this catfish according to a previous study. Based on this, two diets were formulated by substituting protein and lipid for one another, referred to as LPHL (30% P:15% L) and HPLL (50% P:5% L), and two diets were formulated by substituting protein and carbohydrate for one another, referred to as LPHC (30% P:30% C) and HPLC (50% P:0% C). The results showed that dietary composition affected the peak metabolic rate, duration and SDA coefficient. The peak metabolic rate in the LPHC group (211.5 mgO₂ kg^?1 h^?1) was significantly lower than catfish in the control (265.2 mg O₂ kg^?1 h^?1) and the HPLC (257.7 mg O₂ kg^?1 h^?1) group. The SDA duration in the control group (26.8 h) was significantly shorter than those of the HPLL (38.0 h), LPHC (33.8 h) and HPLC (33.8 h) groups. The SDA coefficient in the LPHL group (11.1%) was significantly lower than those of the control and the other groups (13.2–15.4%). The results suggest that in southern catfish, the SDA response to dietary carbohydrate is similar to that of dietary protein, and that the SDA may not be affected solely by an increase in the amount of protein ingested, but may be influenced by interaction of other dietary components.  相似文献   

鲇精子超微结构及pH、温度对其精子活力的影响     

乔志刚  刘淑琰  沈方方 《大连海洋大学学报》2016,(6):602-606

为了解鲇Silurus asotus精子的结构特征,应用扫描电镜和透射电镜技术,对体质量为320~550 g的鲇成熟精子结构进行了观察。结果表明:鲇精子由头和尾两部分组成,无明显颈部;精子头部近球形,直径为1.85~2.51μm,头部无顶体,头部内有高度密集的细胞核染色质,头部后方凹陷形成植入窝,植入窝内有近端中心粒和远端中心粒,细胞核后方与质膜的间隙较大(称袖套),其内富含细胞质、线粒体和囊泡等细胞器;尾部细长,无主段和尾段之分,长为44.3~50.7μm,横切面呈圆形,直径为0.269~0.308μm,透过横断面可见,鲇精子尾部由轴丝和附属纤维构成,外有一层质膜包裹,轴丝与远端中心粒形成"9+2"微管结构。研究表明,精子活力的适宜pH为7.0~8.5,适宜温度为25~29℃,当pH为8.0、温度为28℃时,精子活力最强。  相似文献   

不同摄食状态下南方鲇幼鱼肠道黏液细胞的量化分析   总被引：1，自引：0，他引：1  

李凤杰  曾令清  葛胜东  李秀明  黄小铭  张耀光 《中国水产科学》2013,20(1):75-81

量化分析了南方鲇(Silurus meridionalis)幼鱼在正常摄食节律下摄食前(S0d)、摄食后64 h(S0d-64h)、饥饿16d(S16d)、饥饿32 d(S32d)以及饥饿后首次恢复摄食64 h(S16d-64h,S32d-64h)肠道各类型黏液细胞的反应特征。结果发现,摄食后肠道各部位黏液细胞总数均有一定程度减少,其中前肠减少最为显著(P<0.05);中肠和后肠II型黏液细胞数量显著减少(P<0.05),中肠的III型黏液细胞数量显著增多(P<0.05);肠腔中黏液增多,黏液细胞呈空泡结构。S16d组和S16d-64h组前肠和中肠的I型细胞数量显著减少(P<0.05),III型细胞数量显著增多(P<0.05)。S32d组和S32d-64h组前肠各类型细胞数量以及黏液细胞总数变化不明显(P>0.05);中肠的II型细胞数量显著增多(P<0.05),IV型细胞数量显著减少(P<0.05);饥饿和恢复摄食后肠各类型黏液细胞数目变化不明显(P>0.05)。研究表明,南方鲇幼鱼肠道黏液细胞的摄食反应明显;饥饿胁迫以及恢复摄食后肠道黏液细胞的反应特征与肠道各段的生理功能相适应;面对营养胁迫时,肠道前段能迅速调节黏液细胞的数目,而后肠基本不变,可能是该鱼应对营养缺乏的保护性适应机制。  相似文献   

兰州鲇与鲇形态特征和血清生化指标的比较研究     

杨元昊  周继术  卢玲  李超  吉红  李蕾  王绿洲  王路平 《水生态学杂志》2013,34(1):87-91

比较了黄河中上游水域中特有鱼类兰州鲇(Silurus lanzhouensis)与鲇(Silurus asotus)主要形态学特征和血清生化指标,以期对兰州鲇的资源保护和人工养殖提供参考.结果显示,兰州鲇的颌须长/全长显著大于鲇(P＜0.05);眼径/全长以及口裂宽/全长两者无显著差异(P＞0.05),但兰州鲇眼径显著低于鲇(P＜0.05);兰州鲇血清谷丙转氨酶(ALT)显著高于鲇(P＜0.05),血清钙(Ca)、磷(P)和白球比(A/G)显著低于鲇(P＜0.05),血清谷草转氨酶(AST)、总蛋白(TP)、白蛋白(ALB)、球蛋白(GLO)、白球比(A/G)、尿素(BUN)、总胆固醇(Chol)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-c)、低密度脂蛋白胆固醇(LDL-c)两者均无显著差异(P＞0.05).研究表明,兰州鲇眼径较小,第一颌须较长,2种鲇在形态和血清生化指标上存在一定差别,在钙磷矿物营养代谢上有较大差异,而在蛋白与脂代谢强度上有相似性.  相似文献   

六须鲶暴发性败血症病原菌的分离与鉴定     

陈福艳  陈明  黄婷  张彬  杨家坚  雷爱莹  王瑞  梁万文 《大连水产学院学报》2011,26(1):63-67

从患暴发性败血症的六须鲶Silurus soldatovi身上分离到致病菌株（FY-024）,用常规细菌培养方法对其观察,并进行生理生化特性测试。结果表明,该致病菌均符合鲶爱德华氏菌Edwardsiella ictaluri特征。为了进一步确认该致病菌的分类地位,对其进行了16S rRNA基因序列分析、遗传距离距阵及系统发育树分析,共扩增出1 417 bp基因片段（GenBank登录号为GQ924477）。系统发育结果显示,菌株FY-024与鲶爱德华氏菌的16S rRNA基因同源性达99.6%～99.9%,聚为同一分支,进一步确认致病菌是鲶爱德华氏菌。药敏试验和毒力试验结果显示,菌株FY-024对环丙沙星、恩诺沙星药物高度敏感,按Reed和Muench氏法计算LD50=1.08×106 cfu/尾。  相似文献   

喹烯酮对南方鲇生长性能的影响     

赵海鹏  蒲德永  余必先  周传江  黄林  张耀光 《安徽农学通报》2009,15(5):153-154

采用单因素梯度设计,以不添加任何促生长剂的饲料作对照,在饲料中添加25mg／kg、50mg／kg、75mg／kg、100mg／kg、125mg／kg的喹烯酮饲养南方鲇6周。结果表明：75mg／kg组增重率高于对照组,其它各组稍低于对照组。饲料中添加75mg／kg喹烯酮对南方鲇有一定增重促生长效果。  相似文献   

杂交鲶(怀头鲶♀×鲶鱼♂)胚胎发育进程   总被引：5，自引：0，他引：5  

潘伟志  陈军  赵春刚  王鹏  王丙乾 《东北林业大学学报》2004,32(6):66-68

以低温催产药物进行人工催产、授精 ,获得的杂交鲶受精卵平均卵径 1.6 4mm ,卵粒质量 3.5～ 3.6mg。利用 0 .3%胰蛋白酶对受精卵脱膜 ,解剖镜下连续观察 ,并将其分为胚盘期、卵裂期、囊胚期、原肠期、神经胚期、器官形成期和出膜期七个阶段 ,对所需时间和发育各时期形态特征进行了详细描述。在 18.2～ 19.7℃水温条件下 ,孵化积温为 10 35℃·h ,经 5 1h2 6min孵化出苗。  相似文献   

Haematological and biochemical alterations in Korean catfish, Silurus asotus, experimentally infected with Edwardsiella tarda     

Jin Ha Yu  Jung Jo Han  & Sung Woo Park 《Aquaculture Research》2010,41(2):295-302

This study determined the haematological changes in Korean catfish, Silurus asotus , experimentally infected with Edwardsiella tarda . Twenty-four or 48 h after infection with 1 × 10⁴ colony-forming units (CFU) mL⁻¹ of E. tarda , the fish were anaesthetized and the blood was collected. The haematological and biochemical tests included haematocrit (Ht), haemoglobin (Hb), leucocyte counts (Lc), total calcium (Ca), total protein (TP) concentration, alkaline phosphatase (ALP), glucose (GLU), aspartate aminotransferase, lysozyme and differential leucocyte populations. After 24- and 48-h infection, the values of Ht, Hb, Lc, TP, ALP and GLU were significantly decreased with respect to the control. Aspartate aminotransferase and lysozyme activity in both the 24- and 48-h groups exhibited higher levels compared with those in the control. However, the bacterial infection did not induce any significant alteration in the Ca concentration. After the 48-h infection, neutrophils and macrophage populations were reduced whereas lymphocytes were increased with respect to those in the control and the 24-h infection groups. The present study demonstrates that E. tarda infection causes haemato-biochemical responses that are related to the general physiological condition and defence system in catfish.  相似文献