饲料中添加苜蓿草粉对草鱼生长、肌肉品质和血清抗氧化指标的影响

为研究苜蓿(Medicago sativa L.)草粉对草鱼(Ctenopharyngodon idella)生长性能、肌肉品质和血清抗氧化指标的影响, 在基础饲料(粗蛋白: 32.0%, 粗脂肪: 4.12%)中分别添加0(对照组)、5%、10%、15%和20%的苜蓿草粉, 饲喂初始体重为(50.04±0.04) g的草鱼, 每个处理3个重复, 进行为期61d的养殖实验。结果表明: (1)与对照组相比, 20%苜蓿组的特定生长率显著降低(P<0.05), 15%苜蓿组的饲料系数和摄食率显著升高(P<0.05)。除5%苜蓿组外, 其余苜蓿添加组草鱼的肥满度显著降低(P<0.05); (2)饲料中添加苜蓿草粉显著降低草鱼肌肉中硫代巴比妥酸值和乳酸含量(P<0.05)。10%和15%苜蓿组草鱼肌肉羟脯氨酸含量显著高于对照组(P<0.05)。此外, 在添加苜蓿草粉后, 草鱼肌肉失水率显著升高(P<0.05)。除20%苜蓿组外, 其余苜蓿添加组草鱼肌肉黏附性显著升高(P<0.05), 草鱼肌肉硬度在10%苜蓿组显著高于对照组(P<0.05); (3)20%苜蓿组草鱼血清过氧化氢酶(CAT)活力显著高于对照组(P<0.05)。与对照组相比, 15%、20%苜蓿组草鱼血清谷胱甘肽过氧化物酶(GSH-PX)活力显著升高, 丙二醛(MDA)含量显著降低(P<0.05)。综上所述, 当苜蓿草粉的添加量不超过15%时, 对草鱼生长性能没有显著性影响, 且能改善草鱼肌肉品质, 提高血清抗氧化能力。因此, 草鱼饲料中苜蓿草粉的添加量不应超过15%。     

含棉籽浓缩蛋白饲料添加酵母硒对草鱼生长性能和肌肉品质的影响

研究旨在探讨含棉籽浓缩蛋白(Cottonseed protein concentrate)饲料添加酵母硒(Yeast selenium, YS)对草鱼(Ctenopharyngodon idella)生长性能和肌肉品质的影响。设计了4种等氮等脂实验饲料,分别是在含棉籽浓缩蛋白饲料中添加0 (YS0)、0.3 (YS3)、0.6 (YS6)和0.9 mg/kg (YS9)酵母硒;实验选取初始体重为(309.74±0.36) g的草鱼240尾,随机分成4组,分别投喂4种实验饲料,在池塘网箱中开展为期54d的养殖实验。结果显示:(1)在生长性能方面,与YS0组相比, YS3和YS6组草鱼在生长性能上无显著性差异(P>0.05), YS9组草鱼的终末体重、增重率和特定生长率显著降低(P<0.05)。(2)在肌肉品质方面, YS3组草鱼肌肉的粗蛋白含量、硒含量、羟脯氨酸含量和硬度显著高于YS0组(P<0.05),肌肉纤维直径显著低于YS0组(P<0.05)。研究表明,在含棉籽浓缩蛋白的饲料中添加适量酵母硒(饲料硒含量为0.6 mg/kg),对草鱼的生长性能无影响,且可通过...     

棉籽浓缩蛋白替代饲料中豆粕对草鱼生长性能、健康状况及肌肉品质的影响

研究旨在探讨以棉籽浓缩蛋白(Cottonseed protein concentrate, CPC)替代饲料中豆粕对草鱼(Ctenopharyngodon idella)生长性能、健康状况及肌肉品质的影响。设计了6种等氮(29%)等脂(5%)饲料,分别用棉籽浓缩蛋白替代草鱼饲料中0 (C0)、15%(C15)、30%(C30)、45%(C45)、75%(C75)和100%(C100)的豆粕,饲喂养殖于池塘网箱中平均体重为(502.46±0.40) g的草鱼(Ctenopharyngodon Idella)90d。结果显示:(1)在生长性能方面,草鱼的特定生长率和饲料系数在各组之间均无显著性差异(P>0.05)。与C0组相比, C45组草鱼的脏体比显著升高(P<0.05)。(2)在健康状况方面, C100组血清白球比显著低于C0组(P<0.05), C15组血清超氧化物歧化酶(SOD)活性显著高于C0组(P<0.05);各组草鱼肝脏、肌肉组织未发生病变。(3)在肌肉品质方面,与C0组相比, C75组草鱼肌肉粗蛋白含量和C30组异亮氨酸含量显著升高(P<0.0...     

蚕豆及其提取物对草鱼生长、肌肉成分和血清生化指标的影响

正草鱼(Ctenopharyngodon idella)是我国淡水养殖的重要经济鱼类。生产实践和研究表明,投喂蚕豆可使草鱼肉质变得结实而有韧性,称"脆肉鲩"或"脆化鲩";表现为肌肉硬度、耐咀性、弹性、回复性和黏着性的显著增加~[1—3]。然而到目前为止,尚不清楚究竟是蚕豆中的何种成分使草鱼肉质发生了显著改变。目前已知蚕豆中含有多种活性成分     

池塘循环水养殖对混养草鱼食用品质的影响

为探究养殖模式对草鱼(Ctenopharyngodon idellus)鱼肉品质的影响,实验对两种养殖模式下(传统池塘养殖和池塘循环水养殖)草鱼的食用品质进行了差异比较。结果表明,循环水养殖草鱼肌肉白度和弹性高于传统池塘养殖的草鱼,且其不饱和脂肪酸和必需氨基酸含量均显著高于传统池塘养殖;其中, n-3和n-6系列不饱和脂肪酸含量显著高于传统池塘养殖草鱼,是其1.2倍,使得草鱼的肌肉品质和营养品质更佳。此外,循环水养殖可降低草鱼中带有土腥味和青草味的己醛、庚醛和1-辛烯-3-醇等物质的含量,且鲜味核苷酸(IMP)含量高于传统池塘养殖草鱼,使得草鱼的风味更鲜美、浓厚。研究表明,循环水养殖草鱼的肌肉品质和营养特性均优于传统池塘养殖。     

牛膝多糖对草鱼免疫和抗氧化功能的影响

为探讨在饲料中添加牛膝多糖(ABP)对草鱼免疫和抗氧化功能的影响, 选取平均体重(88.130.76) g的健康草鱼375尾, 随机分成5个处理, 即基础饲料组、0.05 %、0.10 %、0.20 %、0.40 % ABP添加组, 每个处理3个重复, 每个重复25尾鱼, 饲养65 d。结果表明, 在饲料中添加ABP对草鱼头肾体指数影响不显著(P0.05), 对脾体指数影响显著(P0.05), 与对照组相比, 0.05 %、0.10 %、0.20 %和0.40%添加组脾体指数分别增加6.29% (P0.05)、28.00% (P0.05)、9.14%(P0.05)和13.14% (P0.05); 血液中NBT阳性细胞数随着ABP添加量的增加呈增加的趋势, 但各组间差异不显著(P0.05); 在饲料中添加ABP对草鱼血清白蛋白、白介素-１(IL-1)、白介素-6(IL-6)含量和过氧化氢酶活影响不显著(P0.05), 显著影响草鱼血清总蛋白(TP)、碱性磷酸酶(AKP)、酸性磷酸酶(ACP)、溶菌酶(LZM)、-肿瘤坏死因子(TNF-)、超氧化物歧化酶(SOD)及丙二醛(MDA)含量(P0.05)。与对照组相比, 0.40%添加组的TP和AKP分别增加24.64% (P0.05)和33.56% (P0.05); 0.20 %、0.40 %添加组的LZM活力分别增加34.97% (P0.05)和31.21% (P0.05), SOD活力分别增加27.28% (P0.05)和22.41% (P0.05); 饲料中随着ABP添加剂量的增加, 各组血清ACP活性先增加后缓慢下降, MDA含量先下降后上升。与对照组相比, 0.20%、0.40 %添加组ACP活性分别增加15.33% (P0.05)和11.10% (P0.05), 0.05%、0.10 %、0.20 %及0.40%添加组MDA含量分别下降11.97% (P0.05)、21.33% (P0.05)、32.37% (P0.05)和2.53% (P0.05)。饲料中随着ABP添加量的增加, 各组草鱼血清TNF-含量变化规律不明显, 但与对照组相比, 0.20%添加组TNF-含量显著增加(P0.05)。综上所述, 在草鱼基础日粮中添加适量牛膝多糖可以提高草鱼的免疫和抗氧化能力, 建议添加量为0.20%。       

绿色产色链霉菌突变株发酵菌丝体对青脚土杂肉鸡生长性能和肌肉品质的影响

在青脚土杂肉鸡口粮中按照600mg／kg的比例添加绿色产色链霉菌诱变菌株W26菌株的液体深层发酵菌丝体,考察茼丝体别‘肉鸡的生产性能和肌肉品质的影响。实验结果表明：日粮中添加600mg／kg的绿色产色链霉菌菌丝体,叮以显著提高肉鸡的活体重,动物日增重与对照组相比提高了26．84％,显著改善了饲料转化率（P〈0．05）。菌丝体的添加可以提高肉鸡肌肉中必需氨基酸、蛋白质、灰分的含量,降低肌肉肌间脂肪含量,但效果不显著。综合实验结果说明,绿色产色链霉菌诱变菌株的液体深层发酵菌丝体可以显著提高青脚土杂肉鸡的生长性能。     

草鱼两个肌肉生长抑制素cDNA克隆、表达及过量表达对胚胎发育的影响

肌肉生长抑制素(MSTN)是抑制肌肉生长和发育的重要生长调控因子.通过cDNA末端快速扩增法(RACE)克隆草鱼MSTN-1型和MSTN-2型全长cDNA.RT-PCR分析结果表明,MSTN-1在草鱼肌肉、脑和眼中的转录量较高,在肝胰脏、脾脏和心的转录量较低,在肠、腮、性腺和肾中无表达;MSTN-2只在脑和肌内中有表达.在草鱼胚胎发育的0-36 hpf期间,MSTN-1的转录量较低;在胚胎发育的36-48 hpf期间,其转录量呈逐渐升高的趋势;MSTN-2各时相均无表达,可能因为该基因在草鱼胚胎发育过程中不起重要作用.通过分别显微注射MSTN-1型和MSTN-2型mRNA至斑马鱼1-2细胞期胚胎.结果显示,注射MSTN-1型mRNA过表达可导致斑马鱼体节发生期胚胎的前-后轴拉长,背-腹轴变短,脊索轻微扭曲,以及体节发育受到强烈抑制而不分化等现象.注射MSTN-2型mRNA胚胎早期发育有所延迟并未发生明显变化,但发育至60h之后尾部明显发生严重弯曲.     

枸杞多糖对鲤生长性能和肝胰脏抗氧化能力的影响

为探索枸杞多糖(Lycium barbarum polysaccharide,LBP)对鲤生长性能及肝胰脏抗氧化能力的影响,在试验饲料中分别添加比例为0、0. 005%、0. 01%、0. 015%、0. 02%的枸杞多糖,配制成5种等氮等能试验饲料。以450尾平均初始体质量为(10. 57±0. 89)g的健康鲤为试验对象,随机分为5组,每组3个重复,每个重复30尾试验鱼,分别投喂5种试验饲料,养殖时间为56 d。结果发现,鲤增重率(weight gain ratio,WGR)、特定生长率(specific growth ratio,SGR)均在枸杞多糖添加量为0. 005%时最大,分别为(118. 45±23. 80)%、(1. 39±0. 20)%/d,且差异显著(P0. 05)。枸杞多糖添加量大于0. 005%后,WGR,SGR则呈微弱下降的趋势,但差异不显著(P0. 05);饲料系数(feed conversion ratio,FCR)随着枸杞多糖添加量的提高而呈先降低后升的变化趋势,在0. 005%时最小,为1. 54±0. 24(P0. 05);添加量大于0. 005%后,FCR则呈上升趋势,且差异显著(P0. 05)。随着枸杞多糖添加量的提高,鲤肝胰脏超氧化物歧化酶(superoxide dismutase,SOD)、过氧化氢酶(catalase,CAT)活性均呈现先升高后降低的变化趋势,均在枸杞多糖添加量为0. 005%时最高,分别为(110. 85±7. 51)U/mg、(104. 58±4. 53)mg/(g·min)(P0. 05);添加量大于0. 005%后,SOD活性呈微弱的下降趋势。CAT则在其添加量大于0. 01%后呈微弱的下降趋势(P0. 05);丙二醛(malondialdehyde,MDA)含量则呈先降低后升高的趋势,在添加量为0. 01%时最低,为(0. 73±0. 81)nmol/mg,但差异不显著(P0. 05)。研究说明添加一定比例的枸杞多糖可提高鲤对饲料的利用率,促进其生长,提高鲤机体的抗氧化能力,且综合考虑,鲤饲料中枸杞多糖的适宜添加水平为0. 005%。     

饲喂蚕豆对草鱼抗氧化能力及免疫机能的影响

投喂蚕豆100d左右, 草鱼肌肉的弹性和咀嚼性增强, 肌肉品质显著改善, 此种模式养殖的草鱼俗称脆肉鲩。实验比较了投喂蚕豆与商用配合饲料的草鱼, 在养殖过程中(30d、60d、100d)机体抗氧化能力及免疫机能的异同, 以了解脆肉鲩肌肉品质改变过程中鱼体的生物学变化。实验结果表明, 投喂蚕豆显著影响了草鱼血清总抗氧化能力(T-AOC)、血清丙二醛(MDA)含量及肝胰脏超氧化物歧化酶(SOD)活力, 但对肝胰脏T-AOC、MDA含量、谷胱甘肽(GSH)含量及血清SOD活力无显著影响。实验30d和60d时, 投喂蚕豆的草鱼机体抗氧化能力强于投喂配合饲料的草鱼, 但实验100d时两种养殖模式的草鱼机体抗氧化能力无显著差异。投喂蚕豆对草鱼免疫机能有一定的影响, 实验100d时, 投喂蚕豆的草鱼血液红细胞数量(RBC)及白细胞数量(WBC)显著高于投喂配合饲料的草鱼。投喂蚕豆的草鱼血清TP、ALB、GLB含量在实验30d时显著低于投喂配合饲料的草鱼, 在实验60d时与投喂配合饲料的草鱼无显著差异, 在实验100d时又显著低于投喂配合饲料的草鱼。投喂蚕豆显著影响了草鱼脾指数及脾脏中免疫相关基因的表达, 实验末期, 在投喂蚕豆的草鱼脾脏中IL-1、MHC Ⅱ、IFN-1、TNF-的表达量显著高于投喂配合饲料的草鱼。以上结果表明, 投喂蚕豆初期鱼体抗氧化能力增强, 随着投喂时间的增加, 鱼体抗氧化能力降低至与投喂配合饲料相当的水平; 投喂蚕豆使草鱼产生了免疫应答。       

Effect of photosynthetic bacteria on water quality and microbiota in grass carp culture

To investigate the effects of photosynthetic bacteria as additives on water quality, microbial community structure and diversity, a photosynthetic purple non-sulfur bacteria, Rhodopseudamonas palustris, was isolated and used to remove nitrogen in the aquaculture water. The results of water quality showed that the levels of ammonia nitrogen, nitrite nitrogen, total inorganic nitrogen and total nitrogen in the treatment group were significantly lower (p < 0.05) than the nitrogen levels of the controls in an extended range. A 454-pyrosequencing analysis revealed that at the level of phylum, Proteobacteria and Firmicutes were dominant in the control group respectively, compared to the dominance of the phyla Proteobacteria, Bacteroidetes and Actinobacteria in the treatment group. The relative abundance of phyla Bacteroidetes and Actinobacteria in treatment witnessed an increase than that in the control. The results also indicated that the treatment group enjoyed a higher microbial diversity than that of the control group. Based on the oxygen requirement and metabolism, the authors observed that the water supplementation with photosynthetic bacteria could significantly decrease (p < 0.05) the number of nitrite reducer and anaerobic bacteria. Therefore, the results suggested that adding photosynthetic bacteria to water improves the water quality as it changes the microbial community structure.     

Intensive culture of grass carp and hybrid grass carp larvae

Intensive culture of grass carp and hybrid grass carp (Ctenopharyngodon idella x Aristichthys nobilis ) larvae was conducted under Florida (U.S.A.) conditions. The influence of different rearing facilities (indoor tanks, outdoor tanks and cages) and different methods of fish feeding using live zooplankton and artificial food was tested. High survival (86–100%) and satisfactory grass carp growth (47–56 mg) were obtained in the outdoor tanks and cages during the 10–day experiment. It is believed, that the technique described can be used after some improvements for commercial–scale grass carp larvae rearing. Low survival (1–3%) was obtained in the hybrid culture experiment even though satisfactory growth rates (84–212 mg) were obtained after 13 days. High mortality was attributed to genetic abnormalities caused by hybridization. The hybrid does not appear to be a promising fish for culture.     

食物与水环境因子对草鱼(Ctenopharyngodon idellus C.et V)脆化过程的影响

结合生产实际,探讨了普通鲩鱼向脆肉鲩转变的过程和实质,提出用“断裂应力δρ”作为脆肉鲩脆化程度的划分标准,并实验研究了不同水温、水流速度、水化学因子和蚕豆饲料投喂量等因素对脆肉鲩生长和品质的影响。结果表明,以脆肉鲩不同部位组织热变性蛋白质的断裂应力δρ为指标的脆化程度主要由蚕豆饲料摄食量所决定,脆肉鲩养殖的良好条件为:放养规格1.50~2.00 kg/尾,放养密度150~170尾/666.7 m2,,水温在18℃以上;摄食量达到3.962~5.263 kg/kgbw时,可实现饲料系数约为6,脆化程度指标δρ为0.422~0.611 kg/cm2的合格商品脆肉鲩。水体水化学因子等环境条件只对草鱼脆化起间接辅助作用,它们通过改变草鱼的摄食量和营养(能量)转化率,影响机体正常的生理活动而导致草鱼肌肉蛋白合成与积累不同等表达出来,良好的水环境质量利于脆肉鲩养殖。普通鲩鱼脆化养殖的最佳养殖条件为适当的饲料投喂剂量(4.3kg/kgbw),适宜的水环境因子条件(水温(30±2)℃、DO≥5mg/L、pH在5.8~6.2之间)。为进一步完善脆肉鲩养殖生产操作流程,提高脆肉鲩养殖技术,合理调控投饲量和养殖水环境因子,从而提高脆肉鲩品质和养殖效益进行了讨论。     

丙酮体系中柑橘皮中类胡萝卜素与VC及VE的协同抗氧化性研究

研究了避光条件下柑橘皮类胡萝止素提取物与VC及VE在丙酮溶剂体系中的协同抗氧化性,初步探讨了协同效应产生的条件以及机理。结果表明,在VC浓度为100mg／mL,类胡萝卜素起始浓度与VC浓度的比值小于或等于0．05时,或、VE浓度为O．384mg／mL,类胡萝卜素起始浓度与、VE浓度的比值小于或等于1．5时,类胡萝卜素与VC或、VE在丙酮体系中存在显著的助氧化作用;当体系中VC或VE浓度较低时,随反应时间延长,VC或VE可促进类胡萝卜素的氧化降解。     

饲料中HUFA影响草鱼脂质代谢的研究

选用初始体重为(50.14±3.33)g的草鱼80尾,饲养于四个循环水养殖缸4w,饲养期水温18-22℃.分别饲喂以三油酸甘油酯制品(对照组)、三油酸甘油酯制品和精制鱼油混合油(HUFA组)为脂肪源的两种试验饲料.饲养结束后对试验鱼不同组织脂肪酸组成、生物学性状、体组成、血清生化指标、脂质代谢酶活性、脂蛋白脂酶(LPL)基因表达及肝胰脏抗氧化指标进行测定.脂肪酸分析表明,饲料中HUFA显著影响鱼体组成:HuFA组草鱼腹腔脂肪组织中C22:6n-3(P＜0.01)、HUFA(P＜0.05)含量显著升高;肌肉组织中n-3(P＜0.01)、HUFA(P＜0.05)含量显著升高,而C20:4n-6含量显著降低(P＜0.05);肝胰脏和脑组织中HUFA含量没有显著差异(P＞0.05),除脑组织外,肝胰脏、肌肉、腹腔脂肪组织中n-3/n-6均显著升高(P＜0.05).与对照组相比,HuFA组腹腔脂肪指数、肝胰脏脂质含量显著降低,肝胰脏T.AOC活性显著升高(P＜0.05),肝胰脏LPL活性及基因表达丰度均显著降低(P＜0.05).研究指出,饲料中HUFA显著影响了草鱼组织脂肪酸组成,且这种影响具有组织特异性.饲料HUFA具有抑制草鱼脂质合成及向肝组织的脂质转运、降低肝胰脏脂质及腹腔脂肪的沉积、提高草鱼抗氧化能力的作用.     

基于生态位和水质因子的草鱼两种混养模式的比较

试验通过模拟草鱼2种混养模式("鲮-草模式"为草鱼与鲮混养、"鲫-草模式"为草鱼与鲫鱼混养),引入计算机视觉技术分析了草鱼在2种不同养殖模式下的生态位宽度及生态位重叠,同时测定了水体理化指标及鱼类特定生长率。结果表明:"鲮-草模式"组草鱼的特定生长率为1.524%.d-1,显著高于"鲫-草模式"组草鱼的特定生长率(1.346%.d-1);"鲮-草模式"组水体中的铵态氮、硝酸盐、总氮、总磷、活性磷酸盐浓度高于"鲫-草模式"组,而pH、DO、亚硝酸盐浓度及叶绿素a含量低于"鲫-草模式"组;2混养组中草鱼之间的生态位宽度无明显差异;"鲮-草模式"组草鱼与鲮之间生态位重叠指数为0.5598,"鲫-草模式"组草鱼与鲫鱼之间的生态位重叠指数为0.6478,二模式组比较,差异显著;鲮与草鱼之间的竞争较鲫鱼与草鱼之间的竞争小;试验组中鲮与草鱼混养要优于鲫鱼与草鱼混养。     

Effect of substrates of glycolysis and tricarboxylic acid cycle on the level of oxidative processes in spermatozoa of grass carp and carp

Endogenic respiration of grass carp and carp spermatozoids is rather low. Oxidation rate of metabolites is different--malate is oxidized more intensively, it is followed by lactate, pyruvate, succinate. Sperm storage lowers the respiration level and oxidation rate of metabolites.     

Effect of white striping on turkey breast meat quality

In the past decades, the intense selection practices carried out in order to develop fast growing and high breast-yield turkey hybrids profoundly modified the muscle physiology leading to the development of growth-related alterations and muscular abnormalities. White striations of variable thickness have been particularly observed on the ventral surface of Pectoralis major muscle belonging from heavy male turkeys since several years. However, although the effects of white striping (WS) have been extensively studied on broilers, this condition was not considered as a main quality issue by both turkey producers and meat industry. Thus, this study aimed at evaluating whether the occurrence of WS in heavy male turkeys affects the quality traits and technological properties of meat to the same extent previously observed for broilers. In two replications, 72 Pectoralis major muscles were classified as: normal (NORM), moderate WS (MOD) and severe WS (SEV) cases. The whole muscle was weighed and cut in order to assess colour, ultimate pH, water holding (drip and cooking losses) and binding (marinade uptake) capacities, NMR relaxation properties, shear force as well as proximate composition of meat. The Pectoralis major muscles affected by WS (both moderate and severe cases) exhibited a one-fifth increased weight in comparison with their NORM counterpart. However, the occurrence of WS only partially affected the proximate composition of the meat. In detail, although moisture, collagen and protein contents did not differ among the groups, if compared with NORM, higher lipid levels were found in SEV muscles, whereas MOD had intermediate values. On the other hand, both MOD and SEV exhibited lower ash content. Despite these variations in proximate composition, both water holding and binding capacities of turkey breast meat were not affected by WS. Indeed, quality traits of raw (pH, colour, cooking losses and shear force) and marinated (uptake, cooking losses and shear force) meat as well as water distribution within the muscle tissue did not differ between NORM and WS cases. Overall, if compared with broilers, WS only marginally affected quality traits of turkey breast meat. It might thus be hypothesised a diverse specie-specific physiological response to the pressure in muscle tissue induced by the selection in turkeys that, although analogously led to the occurrence of WS, results in limited effects on meat quality.     

草鱼、鲢和瓦氏黄颡鱼幼鱼感应流速的比较

在21±1℃水温下,使用自行制作的鱼类游泳行为测试槽,采用流速递增的方法测定了草鱼(Ctenopharyngodon idellus)(体长9.64±3.12 cm,体重20.97±16.71 g)、鲢(Hypophthalmichthys molitrix)(体长10.60±3.45 cm,体重24.37±18.61 g)和瓦氏黄颡鱼(Pelteobagrus vachelli)(体长11.54±1.46 cm,体重20.98±6.94 g)幼鱼个体的感应流速.结果表明:草鱼、鲢和瓦氏黄颡鱼幼鱼的感应流速分别是(8.21±0.68)、(6.74±0.84)和(33.11±3.06) cm·s-1,相对感应流速分别是(0.91±0.22)、(0.67±0.15)和(2.9±0.29) BL·s-1;鲢和草鱼幼鱼的感应流速差异不显著(P＞0.05),但瓦氏黄颡鱼比草鱼和鲢幼鱼感应流速大近4倍,差异显著(P＜0.05);因此,草鱼和鲢幼鱼较瓦氏黄颡鱼幼鱼对流速的感应更敏感.本实验结果可为设计鱼道、确定拖网速度等提供一定的科学指导.