Acute toxicity of organophosphorous pesticide diazinon and its effects on behavior and some hematological parameters of fingerling European catfish (Silurus glanis L.)     

Sibel ?im?ek Köprücü  Mevlüt ?ener Ural  Murat Pala 《Pesticide biochemistry and physiology》2006,86(2):99-105

Diazinon is commonly used for pest control in the agricultural fields surrounding freshwater reservoirs. So this study was conducted to determine the acute toxicity of this organophosphorous pesticide, contaminating aquatic ecosystems as a pollutant, and its effects on behavior, and some hematological parameters of fingerling European catfish, Silurus glanis. Diazinon was applied at concentrations of 1, 2, 4, 8, 16, 32, and 64 mg L⁻¹. The water temperature in the experimental units was kept at 16 ± 1 °C. The number of dead fishes significantly increased in response to diazinon concentrations 2-64 mg L⁻¹ (p < 0.05). With increasing diazinon concentrations, the fishes exposed duration 1 to 96 h significantly increased the number of dead fishes (p < 0.05 for each cases). The 1, 24, 48, 72, and 96 h LC₅₀ values (with 95% confidence limits) of diazinon for fingerling European catfish were estimated as 14.597 (12.985-16.340), 12.487 (11.079-14.471), 8.932 (7.907-10.348), 6.326 (no data because of p > 0.05), and 4.142 (no data because of p > 0.05) mg L⁻¹, respectively. Compared to the control specimens, fish after an acute exposure to diazinon was significantly lower erythrocyte, leukocyte, hemoglobin, hematocrit, MCV, MCH, and MCHC values (p < 0.05). In addition, it was also showed a significantly negative correlation between these hematological parameters and exposure times of diazinon (p < 0.01).  相似文献   

东北六须鲶的肌肉营养成分与品质评价     

闫先春  郭贵良  安长春 《饲料与畜牧》2008,(12):49-53

对用含蛋白质45％的配合饲料饲养的东北六须鲇的肌肉营养成分进行了分析。结果表明：东北六须鲶肌肉鲜样中粗蛋白质、粗脂肪和水分的含量（均为质量分数）分别为16．47％、2．36％、和79．94％;新鲜肌肉中17种氨基酸的总量为15．74％,其中8种人体必需氨基酸为7．68％,必需氨基酸的构成比例基本符合FAO／WHO的标准,氨基酸评分（AAS）和A／E值均显示,东北六须鲶蛋白质的第一限制性氨基酸为蛋氨酸和胱氨酸;脂肪酸中含有高比例（25．6％）的多不饱和脂肪酸（PUFA）,高于其它名优养殖鱼类。  相似文献   

索氏六须鲶受精早期精子入卵的扫描电镜观察   总被引：13，自引：1，他引：12  

尹洪滨  潘伟志  孙中武 《中国水产科学》2000,7(2):1-4

用扫描电镜对索氏六须鲶受精早期精子入卵过程进行系统观察,结果显示,索氏六须鲶在受精后３０－６０ｓ内完成精子入卵过程,在受精后２ｍｉｎ精子开始逐渐解体,直至受精后１５ｍｉｎ左右,受精卵外精子全部解体。通过对精子和卵子的精孔管的测量判定索氏六须鲶精方式为单精受精。  相似文献   

黄河陕西合阳段兰州鲇的生物学特性及种群特征     

王丰  杨元昊  王实学 《西北农林科技大学学报(自然科学版)》2014,42(7):15-20

【目的】研究黄河陕西合阳段兰州鲇的种质特点和种群生存现状,为黄河鲇的种质资源保护提供依据。【方法】从形态特征、种群组成以及同工酶3个方面,对黄河陕西合阳段兰州鲇的生物学特性及种群特征进行研究。【结果】黄河陕西合阳段兰州鲇各鳍鳍式为,背鳍i-4~5,胸鳍i-11~14,腹鳍i-10~11,臀鳍i-78~87;鳃耙8~12;须2对;体长/头长为4.8~5.4,头长/吻长为2.8~3.2,头长/眼径为11.2~15.0;脊椎骨数目为63~68,比肠长0.91±0.25;具有发达的‘V’型胃,其消化生理特性符合肉食性鱼类的特征。同工酶检测结果表明:黄河陕西合阳段兰州鲇的乳酸脱氢酶(LDH)有2个位点,均为单态;而酯酶(EST)有5个位点,其中EST-3在各组织中广泛表达,且为多态。经鉴定,本次采捕的31尾样本中,3龄鱼占25.8%,4龄鱼占35.5%,比例较高。【结论】黄河陕西合阳段兰州鲇种群存在遗传多样性,但种群组成趋向低龄化,表明其野生资源受到较严重破坏,应及时予以保护。  相似文献   

索氏六须鲶受精细胞学研究     

尹洪滨  孙中武  刘玉堂  潘伟志  王宏伟 《东北林业大学学报》2003,31(6):46-48

采用连续切片显微观察的方法对索氏六须鲶成熟卵的受精细胞进行了研究。结果显示，精子入卵刺激卵细胞形成胚盘，精子头部在胚盘中逐渐核化，形成雄性原核；卵母细胞放出第二极体，完成第二次成熟分裂，形成雌性原核，两性原核结合成合子核；合子核膜消失，产生第一次卵裂，受精全过程历时50min。  相似文献   

南方鲇泌尿系统的结构   总被引：5，自引：0，他引：5  

岳兴建  张耀光  敖磊  王志坚 《西南大学学报(自然科学版)》2007,29(4):137-143

南方鲇肾前部分离,中后部相连,有两条肾索,属于硬骨鱼类的Ⅱ-B型肾,有2-9个斯坦尼斯小体.肾单位弥散分布于肾组织中,肾小体单个分布,肾前中后三部分别为3.8,3.4,2.6个/mm^2,平均直径66.5μm.肾小球毛细血管为有孔型,其间有系膜细胞.足细胞的足突与肾小球毛细血管紧贴并形成滤过孔.肾小管分化为颈段、第一近端小管（PⅠ）、第二近端小管（PⅡ）、远端小管（DS）、集合小管（CS）.颈段（NS）为立方上皮;PⅠ、PⅡ细胞柱状,有丰富的纹状缘.PⅠ细胞顶部有明显PAS阳性带,含有粗面内质网、线粒体及大量电子致密物质.与PⅠ、PⅡ伴行的毛细血管均为有孔型.DS、CS为立方上皮,线粒体、质膜内褶丰富.肾单位除颈段外的各段上皮均有大量游走细胞.各级收集管汇成中肾管通入膀胱.  相似文献   

饲料糖含量对南方鲇幼鱼日常代谢率的影响     

付世建  谢小军 《农业科学与技术》2007,8(3):68-72

笔者设计了系列试验，观测南方鲇在不同糖营养水平下生长、代谢、代谢酶活性等变化，旨在了解南方鲇的糖代谢状况及其在高糖营养条件下的适应性代谢对策，还探讨了糖和体重对日常代谢率的交互作用。  相似文献   

急性低温胁迫对南方鲇和瓦氏黄颡鱼耗氧率和呼吸频率的影响   总被引：2，自引：0，他引：2  

彭姜岚  曹振东  付世建 《安徽农业科学》2007,35(25):7846-7848

[目的]为了研究急性低温胁迫对南方鲇和瓦氏黄颡鱼耗氧率和呼吸频率的影响。[方法]于24℃条件下测定南方鲇和瓦氏黄颡鱼经过不同温度(24、18、12、6、0℃)10 min低温胁迫后耗氧率(VO2)和呼吸频率(Vf)的恢复过程。[结果]结果表明:南方鲇在6、0℃胁迫后VO2和Vf表现为先下降、后上升然后缓慢回落的过程,其余组表现为先迅速上升然后缓慢回落的过程;瓦氏黄颡鱼只有0℃表现为先下降、后上升然后缓慢回落的过程,其余组表现为先迅速上升然后缓慢回落的过程。[结论]瓦氏黄颡鱼对急性低温胁迫抵抗力更高,但同样的低温胁迫瓦氏黄颡鱼需要消耗更多的能量。该研究为生产实践提供了基础数据。  相似文献   

Prey fish selection by Far Eastern catfish <Emphasis Type="Italic">Silurus asotus</Emphasis> and largemouth bass <Emphasis Type="Italic">Micropterus salmoides</Emphasis>     

Osamu?KatanoEmail author  Tomoyuki?Nakamura  Shoichiro?Yamamoto 《Fisheries Science》2005,71(4):862-868

ABSTRACT:   Prey fish selection by Far Eastern catfish and largemouth bass were examined using bluegill, Japanese dace and crucian carp as food fish. In both aquaria (1.2 m × 0.45 m) and ponds (2.8 m × 1.2 m), bluegill was not preyed on by catfish and bass more than dace and crucian carp. In aquaria, there was no significant difference in the consumption of dace and crucian carp between catfish and bass, but in ponds, catfish preyed on dace and crucian carp more and less than bass, respectively. In the case that only bluegill and catfish were introduced in ponds, catfish consumed 4–15 g of bluegill per day. The introduction of catfish into ponds and lakes for the purpose of eradicating bluegill is considered appropriate for areas with few native fish species.  相似文献   

Effect of a constant magnetic field on water quality and rearing of European sheatfish Silurus glanis L. larvae     

Miros&#;aw Krzemieniewski  Mariusz Teodorowicz  Marcin Debowski  & Jaros&#;aw Pesta 《Aquaculture Research》2004,35(6):568-573

The influence of a constant magnetic field with an intensity ranging from 0.4 to 0.6 T (Tesla) was determined on physicochemical parameters of water and on rearing of larvae of the European sheatfish Silurus glanis L. larvae. In the experiment, feeding brood of European sheatfish was reared in two groups. One was kept in tanks supplied with magnetically treated water. The second group was kept in tanks supplied with water without treatment with a magnetic field (control). The fish tanks were supplied with circulating river water. Rearing was conducted for 15 days at an initial stocking density for both groups of 8 fish per litre. The mean fish mass obtained was 0.46 g, and in the control group – 0.78 g (P<0.05). Stocking mortality was 19.1% in the tanks with a constant magnetic field, and 13.5% in the control group. No changes were observed in water phosphate, ammonium, organic compounds or chloride concentrations.  相似文献