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1.
在水温(25±0.5)℃下,将10 000尾4日龄的体长(0.25±0.004)cm的全雄黄颡鱼Pelteobagrus fulvidraco仔鱼放入长2m×宽1.4m×水深30cm的孵化槽中,投喂轮虫、卤虫无节幼体和蝇蛆三种开口饵料,研究不同开口饵料对黄颡鱼仔鱼生长、存活率以及免疫相关酶活性的影响。结果表明,饲养3d时,投喂卤虫无节幼体组仔鱼的体质量显著大于轮虫组(P0.05),而投喂蝇蛆组仔鱼的体质量介于二者之间,且与两组无显著差异(P0.05);7d后,投喂蝇蛆组仔鱼体质量最大,显著大于后两组(P0.05),卤虫无节幼体组次之,轮虫组最小;投喂蝇蛆组仔鱼的存活率最高,投喂蝇蛆组仔鱼酸性磷酸酶(ACP)、碱性磷酸酶(AKP)和溶菌酶(LZM)活力显著高于其他两组(P0.05),而其他两组仔鱼这三种酶活力没有显著影响。认为与轮虫、卤虫无节幼体相比,蝇蛆是一种更适宜黄颡鱼仔鱼培育的开口饵料。  相似文献   

2.
在水温（22±1）℃、盐度（32±1）和90 W太空灯每日光照12 h、昏暗12 h下，将形态完整、活力强的伞径（3.5±0.5）cm的大西洋金黄水母（Chrysaora quinquecirrha）幼水母体放入200 L亚克力环形实验缸中，投喂海月水母（Aurelia aurita）、卤虫（Artemia）无节幼体、大黄鱼（Larimichthys crocea）鱼卵、大银鱼（Protosalanx hyalocranius）肉、糠虾、桡足类和卤虫成虫，研究这7种天然饵料对大西洋金黄水母幼水母体存活和生长的影响。结果表明，（1）不同饵料显著影响幼水母体的存活率（P<0.05），各处理组存活率由高到低依次为：海月组、卤虫无节幼体组、卤虫成虫组、鱼卵组、鱼肉组、糠虾组和桡足类组，其中海月组的存活率显著高于其他组（P<0.05）;(2)不同饵料显著影响幼水母体的生长（P<0.05），各处理组生长速度由快到慢依次为：卤虫无节幼体组、卤虫成虫组、海月组、鱼肉组、糠虾组、鱼卵组、桡足类组，其中卤虫无节幼体组生长速度显著快于其他组（P<0.05）。卤虫无节幼体、卤虫成虫和海...  相似文献   

3.
通过脊尾白虾幼体饵料搭配的比较试验,研究了海水小球藻、中肋骨条藻分别与虾片和卤虫无节幼体搭配投喂对脊尾白虾幼体的变态速率、存活率及体长变化的影响。结果表明,单一使用虾片的育苗效果较差,幼体发育至2期溞状幼体后开始大量死亡,只有约30%的幼体变态成3期溞状幼体;投喂卤虫无节幼体与中肋骨条藻搭配组的脊尾白虾幼体组在第8d时有46%的幼体变态为仔虾,至第10d时幼体100%变态为仔虾;此外,卤虫无节幼体与中肋骨条藻搭配组幼体的存活率为92%,其幼体在1期仔虾平均体长为5.199mm,平均日增长达到0.3079mm/d。由此可见,卤虫无节幼体与中肋骨条藻搭配有利于脊尾白虾幼体的生长发育,可用于脊尾白虾育苗生产。  相似文献   

4.
以美洲西鲱(Alosa sapidissima)仔鱼(孵化后10 d)为实验对象,在室内进行为期30 d的摄食生长试验,分别投喂不同的饵料[单独投喂卤虫(Artemia)、单独投喂微颗粒饲料、卤虫与微颗粒饲料混合投喂],分析不同饵料的投喂对存活、生长、消化酶活性、非特异性免疫相关酶活性以及体脂肪酸组成的影响。结果表明:(1)混合投喂组的存活与生长表现都要显著优于卤虫组和微颗粒饲料组(P0.05),微颗粒饲料组与卤虫组相比差异不大,而试验后期(20~30 d)微颗粒饲料组的存活与生长表现要优于卤虫组;(2)消化酶的结果显示,胃蛋白酶和淀粉酶活力在各组中无显著性差异(P0.05),胰蛋白酶、糜蛋白酶和脂肪酶在卤虫组中活力最低,显著低于其他两组(P0.05),其中糜蛋白酶和脂肪酶活性在微颗粒饲料组中要显著高于混合投喂组(P0.05);(3)碱性磷酸酶和超氧化物岐化酶活力在各组中无显著性差异(P0.05),过氧化氢酶和溶菌酶活力在微颗粒饲料组中最高,卤虫组中最低,两者之间差异显著(P0.05);(4)鱼体脂肪酸受饵料脂肪酸组成影响较大,微颗粒饲料中n-3HUFA和DHA含量较高,其投喂后在鱼体中的含量也高。综上所述,不同饵料投喂对美洲西鲱仔稚鱼存活、生长、消化酶活性、非特异性免疫相关酶活性以及体脂肪酸影响显著,在试验20 d之前使用卤虫与微颗粒饲料混合投喂,20 d后完全转食微颗粒饲料,可以降低成本,同时提高生产效率。  相似文献   

5.
本研究以脊尾白虾(Exopalaemon carinicauda)幼体为研究对象,研究了牟氏角毛藻(Chaeroeeros moelleri)、褶皱臂尾轮虫(Brachionus plicatilis)和卤虫(Artemia salina)无节幼体搭配投喂对脊尾白虾幼体的存活率(SR)、变态发育和消化酶的影响。结果显示,单一卤虫组的幼体变态发育速度最快,14 d内全部变态为仔虾,其他3组则需要15 d;单一卤虫组、牟氏角毛藻+卤虫组和轮虫+卤虫组的幼体变态为仔虾时的SR分别为84.33%、84.67%和83.00%,各组间差异不显著(P>0.05);投喂牟氏角毛藻+轮虫+卤虫混合饵料组的幼体在Z5~P阶段大量死亡,变态为仔虾时的SR为35.67%。单一卤虫组投喂的脊尾白虾幼体的胃蛋白酶(1.94 U/mg prot)、脂肪酶(2.35 U/mg prot)和α-淀粉酶(0.13 U/mg prot)活力在4个组中最高,牟氏角毛藻+轮虫+卤虫组的胃蛋白酶(0.08 U/mg prot)、脂肪酶(0.91 U/mg prot)和α-淀粉酶(0.08 U/mg prot)活力在4个组中最低;牟氏角毛藻+卤虫组和轮虫+卤虫组的α-淀粉酶活力均为0.12 U/mg prot,而轮虫+卤虫组幼体的脂肪酶(1.78 U/mg prot)和胃蛋白酶(0.39 U/mg prot)比牟氏角毛藻+卤虫组分别高0.35和0.04 U/mg prot。研究表明,在脊尾白虾育苗过程中,投喂卤虫无节幼体(3~5 ind./mL),能提高幼体SR和加快变态发育速度,同时,在养殖过程中加入一定的牟氏角毛藻可减缓养殖水体恶化的速度。  相似文献   

6.
文章采用湛江叉鞭金藻(Dicrateria zhanjiangensis)、纤细角毛藻(Chaetoceros gracilis)、绿色巴夫藻(Pavlova viridis)、扁藻(Platymonas subcordiformis)、小球藻(Chlorella vulgaris)及混合藻(金藻和角毛藻1∶1混合)投喂紫海胆(Anthocidaris crassispina),研究了微藻饵料对紫海胆浮游幼体生长发育的影响。结果表明,不同饵料对紫海胆浮游幼体生长发育的效果有差异,金藻是最佳饵料品种,角毛藻次之,其后分别为巴夫藻、小球藻和混合藻,扁藻不适于作为紫海胆浮游幼体的开口饵料。就饵料种类而言,金藻作为紫海胆浮游幼体饵料的成活率可达(23.12±1.8)%,显著高于其他单胞藻类(P<0.05)。就发育速度而言,以角毛藻和金藻混合喂食的海胆浮游幼体整体发育速度最快,幼体平均体长为(885.25±30.49)μm,显著高于其他5种处理(P<0.05);投喂巴夫藻的浮游幼体前期生长较慢,体长为(337.98±24.56)μm,后期较其他单胞藻类生长快,体长可达(580±32.95)μm,适宜作为紫海胆浮游幼体后期饵料。  相似文献   

7.
研究了卤虫无节幼体、专用仔鱼料、鳗鱼仔鱼料等3种不同饵料对西藏尖裸鲤(Oxygymnocypris stewartii)、异齿裂腹鱼(Schizothorax o'connori Lloyd)、拉萨裂腹鱼(Schizothorax waltoni Regan)等3种鱼类仔鱼生长和存活的影响。实验尖裸鲤、异齿裂腹鱼、拉萨裂腹鱼仔鱼的初始全长分别为(13.29±0.52)mm、(12.29±0.44)mm、(15.81±0.50)mm,实验周期分别为25 d、25 d、15 d。结果表明:与其他饵料组相比,投喂专用仔鱼料组,异齿裂腹鱼仔鱼和拉萨裂腹鱼仔鱼的平均全长、全长增加倍数以及存活率均高于其他各组,并有显著差异;尖裸鲤仔鱼的平均全长和全长增长倍数也高于其他各组,但存活率较投喂卤虫无节幼体低,并有显著差异。  相似文献   

8.
为比较卤虫无节幼体(Arternia nauplii)和配合饵料的饲喂效果,分别采用两种饵料饲养30日龄的诸氏鲻虾虎鱼(Mugilogobius chulae)75d,比较存活、生长和全鱼成分。结果表明,卤虫组的存活率较高(≥52%),显著高于配合饵料组(14%～21%);配合饲料组的相对增重率(GW)为2 916.8%～3 998.7%,特定生长率(SGR)为4.5～5.0,生长效果优于卤虫组(GW为1 826.5%～2 101.7%,SGR为3.9～4.1);全鱼成分测定,卤虫组的水分、粗蛋白、粗脂肪、灰分含量分别为72.7%、19.5%、4.7%、3.0%,配合饵料组的分别为70.5%、18.7%、5.8%、3.5%,两组没有显著差异。适当延长饲喂卤虫无节幼体的时间,然后采用配合饵料进行饲养,能提高存活率并获得较好的生长效果。  相似文献   

9.
为探讨牛磺酸强化卤虫无节幼体对其体成分的影响,试验分别以0、10、100、1 000mg/L浓度的牛磺酸强化卤虫无节幼体12h和24h后,采用国标法检测卤虫无节幼体水分、粗蛋白、粗脂肪、粗灰分、钙和磷的含量。试验结果显示:100mg/L牛磺酸强化卤虫无节幼体12h能显著提高其粗蛋白(P0.05)、粗脂肪、钙和磷的含量,显著降低其粗灰分含量(P0.05);10mg/L牛磺酸强化卤虫无节幼体24h能显著提高其粗蛋白和钙的含量(P0.05),显著降低其粗脂肪和粗灰分含量(P0.05);100mg/L牛磺酸强化卤虫无节幼体24h能显著提高其粗蛋白、钙和磷的含量(P0.05),显著减低其粗脂肪和粗灰分含量(P0.05)。表明:本试验条件下10mg/L牛磺酸强化卤虫无节幼体24h能显著改善卤虫无节幼体的体成分。  相似文献   

10.
以海蜇新生螅状幼体为研究对象,采用实验生态学方法研究3种高温(室内恒温、夏季常温、夏季高温)、3种饵料投喂频率(无饵料投喂、每7 d投喂1次、每2 d投喂1次)及其交互作用对海蜇螅状幼体的死亡率、个体生长和足囊繁殖的影响,试验持续45 d。试验结果显示：高温条件下,饵料投喂频率显著影响海蜇螅状幼体的死亡率(P<0.05);而高温、饵料投喂频率及两者交互作用均显著影响海蜇螅状幼体的相对生长率(P<0.05);各高温组中螅状幼体生成的足囊数均随饵料投喂频率的增加而增多;足囊萌发率最多出现在夏季常温-每7 d投喂1次组,平均为34.34%;饵料投喂频率对海蜇螅状幼体生成足囊数及足囊萌发率影响显著(P<0.05),高温及两者交互作用对海蜇螅状幼体生成足囊数及足囊萌发率影响均不显著(P>0.05)。试验结果表明,尽管高温条件下海蜇螅状幼体死亡率高,但存活的螅状幼体足囊繁殖速度快,足囊繁殖速度随温度的升高而加快可能是螅状幼体应对高温死亡率增加的一种繁殖策略。试验结果可为提高海蜇育苗技术和准确预报苗种产量提供科学依据。  相似文献   

11.
An artificial diet for shrimp larvae was microencapsulated with a polysaccharide blend [66% gum arabic, 17% mesquite gum and 17% maltodextrin 10 dextrose equivalent (DE)]. Microencapsulated diet (MD) was fed to mysis alone, as a co‐feed with the microalgae Chaetoceros cerastosporum and Tetraselmis chuii (mixed) and compared with a live diet (control) of C. cerastosporum, T. chuii and Artemia nauplii. No significant differences (P > 0.05) were detected in growth rates, development and quality indexes of larvae fed the three experimental diets. All diets supported survival percentages of >90%. Shrimp larvae fed MD and mixed diets had higher specific trypsin activity and soluble protein content than those fed live diet. Amylase activity decreased in larvae fed the mixed and MD apparently due to the carbohydrate composition of the diet. The results indicate that it is possible to substitute a live diet with a microencapsulated one (with a wall composition made up of a polysaccharide blend) in Litopenaeus vannamei mysis.  相似文献   

12.
为研究橡胶籽油替代豆油对草鱼(Ctenopharyngodon idellus)生长性能、消化酶活性、血脂水平、蛋白质代谢及抗氧化功能的影响,分别以橡胶籽油替代0(对照组)、25%、50%、75%和100%豆油配制5种等氮等能饲料,进行10周饲养实验。实验显示,0~50%替代组草鱼增重率、日增重系数显著高于100%替代组(P<0.05)。随着橡胶籽油替代豆油比例的升高,饲料系数呈先下降后上升的趋势,其中,25%替代组饲料系数最低,显著低于50%~100%替代组(P<0.05);25%替代组蛋白质效率最高,显著高于其他处理组(P<0.05)。随着橡胶籽油替代比例的升高,肠道胰蛋白酶、脂肪酶活性呈先上升后下降的趋势,其中,25%替代组脂肪酶活性最高,显著高于其他处理组(P<0.05),50%替代组胰蛋白酶活性最高,显著高于对照组、75%和100%替代组(P<0.05)。0~50%替代组肝胰脏胰蛋白酶活性显著高于75%和100%替代组(P<0.05)。25%~100%替代组血清总胆固醇(TC)含量显著低于对照组(P<0.05)。随着橡胶籽油替代比例的升高,肝胰脏天门冬氨酸氨基转移酶(AST)、丙氨酸氨基转移酶(ALT)活性呈先下降后上升的趋势,其中,25%替代组AST、ALT活性最低,显著低于对照组和100%替代组(P<0.05)。0~25%替代组血浆总抗氧化力(TAC)显著低于75%和100%替代组(P<0.05)。对照组血浆、肝胰脏丙二醛(MDA)含量显著高于100%替代组(P<0.05)。由此可知,橡胶籽油替代25%~50%豆油对草鱼生长性能、饲料利用率、血脂水平、抗氧化功能指标均无不良影响;但替代超过50%时显著降低草鱼生长性能和消化酶活性。  相似文献   

13.
The effects of methionine‐enriched Artemia nauplii on growth, amino acid profiles and activity of absorption enzymes and antioxidant capability of common carp (Cyprinus carpio var. Jian) larvae were investigated in this study. The newly hatched Artemia nauplii enriched with methionine at four levels (0, 400, 800, 1,600 mg/L) for 16 hr was used as live food for common carp larvae for 21 days. The results demonstrated that the level of methionine in nauplii enriched with methionine increased significantly as the level of supplemental methionine rose (p < 0.05). The specific growth rate (SGR) and body length growth rate (BLGR) values in all experimental groups were significantly higher than those in the control group (p < 0.05) in the trial period. With the supplement of methionine, the amino acid profiles vary depending on the type of amino acid and/or the level of methionine applied. Further examination revealed that the activity of absorption enzymes in the 800 and 1,600 mg/L groups were all significantly higher compared to the other two groups (p < 0.05). Similar results on the antioxidant capability of fish larvae were also observed among the treatments. The changes in these physiological factors allowed for the control of the content of supplemental methionine in Artemia nauplii for larvae and potentially the ability to improve the growth performance of common carp larvae.  相似文献   

14.
Larvae of Uca pugilator (Bosc) were reared in the laboratory from hatching to the megalopa stage on three different diets: (1) newly hatched Artemia salina nauplii (diet A), (2) the rotifer Brachionus plicatilis (O.F. Müller) and a ciliate Euplotes sp. (diet RC), and (3) a combination of the above two diets (diet ARC). The survival rate of zoeae fed diet A (90.0%) and diet ARC (93.8%) was much higher than that of the larvae fed diet RC (22.5%). The duration of the zoeal stages was significantly shorter for the larvae fed diet ARC than for those fed diets A and RC. The survival rate of megalopa larvae (reared on diets A and ARC in the zoeal stages) was high (above 90%) for megalopa fed Artemia nauplii only, as well as for those fed a combination of Artemia nauplii and shrimp. No significant differences in duration of the megalopa stage were found between the latter diet groups.  相似文献   

15.
Phototrophic Bacteria as Feed Supplement for Rearing Penaeus monodon Larvae   总被引：1，自引：0，他引：1  
Larvae of the giant tiger prawn Penaeus monodon were reared from the naupliar to pos-tlarval stage, based on a diet of waste-grown phototrophic bacterium Rhodovulum sulfido-philum , the marine diatom Skeletonema costatum , and brine shrimp Artemia The experimental design consisted of feeding the protozoea with diatoms and varying proportions of bacterial biomass as diet D0 (0%), D1 (1%), D2 (2%), D3 (3%), and D5 (5%), while mysis and postlarvae were fed the above diet supplemented with Artemia nauplii. Controls were not fed with bacteria biomass (diet D0). The addition of R. sulfidophilum biomass in the diet had significant effects on the growth and survival of P. monodon larvae. In the first experiment, the larvae fed with diet D1 ( Skeletonema + 1% R. sulfidophilum ) reached the first postlarval stage (PL1) on the ninth day of feeding and had a mean total length (TL) of 6.13 ± 0.05 mm, which was significantly higher ( P < 0.001) than TL of larvae fed with the other three diets. In another experiment, prawn larvae fed with diet D2 had the highest overall survival of 46% and a significantly larger mean TL of 6.88 ± 0.18 mm at PL1 compared to larvae fed with diet D0 and D3 ( P > 0.05). However, in both experiments prawn larvae fed with the various diets showed significant differences in their length-at-stage ( P > 0.05), and the lowest growth and survival were obtained from diets comprising 3% and 5% bacterial biomass, which also gave the highest levels of ammonia-nitrogen in the culture water. Addition of more than 2% R. sulfidophilum biomass apparently deteriorates the quality of the culture water.  相似文献   

16.
本实验旨在研究饲料中添加酵母水解物对凡纳滨对虾(Litopenaeus vannamei)生长性能、血清生化指标、肝胰腺消化酶活性以及肠道形态的影响。酵母水解物添加量分别为0%、1%、3%和5%,配制4种等氮等脂(42.5%粗蛋白和8.5%粗脂肪)的实验饲料。选取初始体重为(1.86±0.02)g的凡纳滨对虾480尾,随机分为4组,每组4个重复,每个重复30尾,进行为期8周的养殖实验。结果表明饲料中添加5%酵母水解物组的增重率(WGR)、特定生长率(SGR)和蛋白质效率(PER)显著高于对照组(P0.05),而该组饲料系数(FCR)最低(P0.05)。对虾全虾粗蛋白含量随饲料中酵母水解物的增加而呈上升趋势,且5%酵母水解物添加组显著高于对照组(P0.05)。添加5%的酵母水解物显著提高了凡纳滨对虾血清总蛋白(TP)和甘油三酯(TG)含量,降低了谷草转氨酶(AST)和谷丙转氨酶(ALT)的活性(P0.05)。各处理组肝胰腺淀粉酶活性和对照组相比差异不显著(P0.05),但3%酵母水解物添加组的胰蛋白酶和脂肪酶活性显著高于对照组(P0.05)。3%酵母水解物添加组的对虾肠道皱襞高度和皱襞宽度显著高于对照组(P0.05),而5%添加组的微绒毛高度显著高于对照组(P0.05)。综上所述,在本实验条件下,饲料中添加3%~5%的酵母水解物能有效改善凡纳滨对虾生长性能、提高饲料利用率、促进消化吸收以及改善肠道形态学指标。  相似文献   

17.
Abstract

Three experiments were conducted. In Experiment 1, the acceptance time of pelleted diets sprayed with fresh palm fruit extract (FPFE), commercial palm oil (COM), or a control diet to African catfish, Clarias gariepinus, fingerlings was investigated. In Experiment 2, the effects of five diets on growth and survival of African catfish larvae were determined: (1) bambara nut waste-based (BW) diet; (2) bambara nut waste-based diet with 5% of diet formula of FPFE (BWP); (3) bambara nut waste-based diet with 5% of diet formula of FPFE plus 1.5% of diet formula of Spirulinapowder (BWPS); (4) fish waste-based diet (FWP); and (5) brine shrimp, Artemiasp., nauplii (control). In the BWP, BWPS, and FWP diets, fresh palm fruit extract was sprayed on the diets as a feed attractant. The Spirulinapowder was included in BWPS as an additional attractant. In Experiment 3, the effects of seven diets on growth and survival of the African catfish larvae were investigated: (1) BW; (2) BWP; (3) FWP; (4) a bambara waste-based diet with 5% COM (BWC); (5) a fish waste-based diet with 5% of formula as COM (FWC); (6) a fish waste-based diet with neither FPFE nor COM, and (7) brine shrimp nauplii (control). African catfish finger-lings accepted the pellets containing FPFE in significantly less time (P < 0.01) than they did the other pelleted diets. Inclusion of FPFE as 5% of diet formula significantly (P<0.05) improved the growth and survival of African catfish larvae fed formulated diets. Inclusion of Spirulinaat 1.5% of diet formula had no effect. Brine shrimp was nutritionally superior to the formulated diets for the African catfish larvae during the first 28 days of feeding. The results indicate that FPFE can be added to a diet for African catfish at 5% of diet formula. However, brine shrimp nauplii fed to larvae had the highest percentage survival and highest growth rates of any of the treatments.  相似文献   

18.
饲料中不同蛋白含量对斑节对虾幼虾生长及消化酶的影响   总被引：1，自引：1，他引：0  
选用鱼粉、豆粕和大豆浓缩蛋白为主要蛋白源,配置6个蛋白质水平梯度(36%、38%、40%、42%、44%、46%)的饲料,对斑节对虾幼虾(1.03±0.02 g)进行56 d养殖实验,研究饲料中不同蛋白含量对斑节对虾幼虾生长及消化酶活性的影响。结果表明,(1)摄食40%蛋白饲料的斑节对虾的增重率(417.35%)和特定生长率(2.93%·d-1)获得最大值并显著高于36%蛋白饲料组(P<0.05),但与其它各组无显著差异。饲料蛋白水平在38%时的饲料系数(1.88)最低且与44%和46%蛋白饲料组存在显著性差异(P<0.05)。(2)虾体蛋白含量在44%饲料蛋白组最高,且显著高于36%、38%和42%组(P<0.05)。(3)斑节对虾的蛋白质表观消化率在42%蛋白组最高,44%和46%蛋白饲料组的蛋白质效率显著低于36%～42%蛋白饲料组(P<0.05)。(4)随着蛋白水平的提高,斑节对虾的蛋白酶活性呈现由高到低波动的趋势;淀粉酶活性随着饲料蛋白含量的升高而呈下降趋势,胃淀粉酶活性在38%～42%蛋白饲料组显著高于36%蛋白饲料组(P<0.05),肠淀粉酶活性在42%蛋白饲料组显著高于其它各组(P<0.05)。通过饲料中蛋白质含量与增重率的回归分析,斑节对虾幼虾饲料蛋白的适宜含量为39.70%。  相似文献   

19.
不同开口饵料对克氏原螯虾幼虾发育及消化酶活性的影响   总被引：3，自引：0，他引：3  
实验采用丰年虫无节幼体、草鱼鱼糜、水蚯蚓、1号人工配合饲料和2号人工配合饲料为克氏原螯虾的开口饵料,观察幼虾存活率和生长情况。经过40d的培育,对幼虾的胃蛋白酶、胰蛋白酶、淀粉酶和脂肪酶的活力进行测定。结果表明：投喂丰年虫无节幼体的实验组幼虾存活率最高,为75,增重率和增长率也最大,分别为4746.00和171.00。幼虾的胃蛋白酶活性与投喂的饵料密切相关,投喂丰年虫无节幼体组幼虾的胃蛋白酶和胰蛋白酶活性分别为2.18U/mgprot和0.96U/mgprot,极显著高于投喂草鱼鱼糜实验组。实验的5种开口饵料中,丰年虫无节幼体是克氏原螯虾幼虾的最佳开口饵料。摄食丰年虫无节幼体可能提高了主要消化酶的活性,从而促进了克氏原螯虾幼体的生长。  相似文献   

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