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1.
为了提高稻田养殖的效率,了解不同养殖密度对华南鲤(Cyprinus carpio rubrofuscus)幼鱼生长特性的影响,本研究在室内水族箱中养殖初始体质量约为0. 35 g、孵化三周的华南鲤幼鱼,密度分别为M1 (43. 48尾/m2)、M2 (86. 96尾/m2)、M3 (173. 91尾/m2)、M4(347. 83尾/m2)四个组,进行11周的养殖试验。试验结果表明,养殖密度对存活率无显著影响,但华南鲤幼鱼的体质量、体长、日增重(DWG)、净增重(NY)、肥满系数、变异系数(CV)和特定生长率(SGR)都随着养殖密度的增加而降低; M1组的体质量、体长、日增重、净增重、特定生长率均最大,其中日增重、净增重、特定生长率均与M2组无显著差异,但是M1组的变异系数较M2组要小。研究结果表明,此阶段华南鲤幼鱼最适养殖密度为M1 (43. 48尾/m2)。  相似文献   

2.
为了解在池塘养殖条件下,养殖密度对图们雅罗鱼(Leuciscuswaleckiitumensis)生长指标和饲料利用率的影响。在水温11.8~27.3℃,将初始体重没有显著差异的图们雅罗鱼幼鱼以3尾/m~2(D1)、6尾/m~2(D2)、9尾/m~2(D3)和12尾/m~2(D4)的密度放养。经过90d的养殖,结果表明:养殖密度对养殖水质、体重、变异系数、肥满度、增重率、日增重、特定生长率、存活率和饲料系数均有显著差异。高密度组NH4+-N大于0.025 mg/L,TP大于0.01 mg/L,TN大于0.05 mg/L;体重、增重率、日增重、特定生长率,9尾/m~2密度组差异最大,与其余3个密度组有显著差异;生长离散低密度组(D1、D3)与高密度组(D3、D4)有显著差异,低密度组之间、高密度组之间无显著差异;12尾/m~2存活率最低,与其他密度组有显著差异;肥满度和饲料系数低密度组之间、高密度组之间均无显著差异,低密度组与高密度组之间有显著差异。综合试验结果,建议图们雅罗鱼幼鱼放养密度在9尾/m~2。  相似文献   

3.
本文以全雌虹鳟(Salmo trutta)为研究对象,通过设置不同养殖密度梯度,对处于幼鱼期的虹鳟进行常规生长指标差异测定,综合分析养殖密度对其生长性能的影响。试验共设置5个养殖密度组,即每个试验槽分别放养400、600、800、1 000、1 200尾,每组3个重复。经过61 d的养殖试验,虹鳟幼鱼体质量从0.35 g长到30.0 g,结果表明:不同养殖密度条件下虹鳟幼鱼的生长指标表现出明显的不同,其中最终体质量、日增重、特定生长率及净增重均随着养殖密度的增大而呈现下降趋势,日均增重由(0.494±0.0025)g下降到(0.427±0.0021)g,降幅明显。在本案例下,1.3827 kg/m~2左右的养殖密度较为合理。  相似文献   

4.
本实验以平均初始体重为15.60 g的红鳍东方鲀(Takifugu rubripes)幼鱼为研究对象,研究饲料中蛋白含量及养殖密度对红鳍东方鲀幼鱼生长性能、氮排泄及相关生理生化指标的影响。设计两因素三水平(2×3)实验,配制3种不同蛋白梯度(38.87%、45.55%和51.00%,干重)的等脂实验饲料,设置3个密度梯度为1.53 kg/m3 (0.196 m3体积的实验桶,每桶20尾鱼)、2.30 kg/m3(每桶30尾鱼)和3.06 kg/m3(每桶40尾鱼)。每组饲料设3个重复,养殖实验为期56 d,在室内流水系统内进行。结果显示,增重率在高、中蛋白组显著高于低蛋白组(P<0.05),但当饲料蛋白含量一定时,养殖密度对增重率没有显著性影响。饲料蛋白含量和养殖密度对鱼体常规成分没有显著性影响。当饲料蛋白一定时,高密度组的血清总蛋白和胆固醇含量显著高于中密度组(P<0.05)。血清总蛋白含量在低蛋白组显著高于中蛋白组(P<0.05)。血清碱性磷酸酶含量在低蛋白组显著高于高蛋白组(P<0.05)。饲料蛋白含量和养殖密度对红鳍东方鲀幼鱼的生长、氨氮排泄没有显著性交互作用。静水投喂3 h后,氨氮排泄率在高密度组显著高于低密度组(P<0.05)。研究表明,45.55%饲料蛋白质含量已经能够满足红鳍东方鲀幼鱼正常生长的需求。饲料蛋白含量和养殖密度对红鳍东方鲀幼鱼的生长性能和氨氮排泄没有显著性交互作用。  相似文献   

5.
为了解早期多级分养对翘嘴鳜( Siniperca chuatsi)的生长及水质影响,用网箱将翘嘴鳜幼鱼在不同培育密度(1000,1500,2000尾/m2)下进行连续三级筛选养殖试验。结果显示,各密度组鳜幼鱼的生长速度存在差异,随着养殖密度的增加,鱼体生长速度降低;存活率在中等密度(1500尾/m2)组最高;在鱼苗3 cm之后,水体氨氮含量显著性升高。结果表明,三级分养策略可以有效提高苗种规格整齐度;使存活率显著性提高。鱼种在幼鱼早期生长速度快,需注意此阶段的营养需求。  相似文献   

6.
本文主要研究密度对网箱养殖硬头鳟Oncorhynchus mykiss存活和生长的影响。在水温8.2~19.1℃下,将体质量1.02 kg的硬头鳟鱼种养殖在5m×10m×6m网箱中,网箱放置在松花江上游的松山水库中,密度分别为5尾/m~2(Ⅰ组)、8尾/m~2(Ⅱ组)、11尾/m~2(Ⅲ组)和14尾/m~2(Ⅳ组),投喂粗蛋白含量为42%、粗脂肪22%的颗粒饲料,常规养殖。145d的养殖表明:网箱养殖的放养密度对硬头鳟的生长有一定影响。第Ⅳ组鱼的存活率显著低于其他3组(P0.05);放养密度为5~11尾/m~2时硬头鳟的生长与密度呈正相关,大于此密度范围则呈负相关。第Ⅲ组鱼的终末体质量、日增重、增重率、利润和利润率显著高于其余3组(P0.05);4个密度组硬头鳟的产量随放养密度增加而递增。本试验表明:网箱养殖硬头鳟的放养密度为11尾/m~2较适宜。  相似文献   

7.
随机选取体质量为10.0~10.7g的黄姑鱼Nibea albiflora幼鱼450尾,设置4个养殖密度,依次为15尾/缸(1.49 kg/m3)、30尾/缸(3.00 kg/m3)、45尾/缸(4.84 kg/m3)、60尾/缸(5.81 kg/m3),研究密度胁迫对黄姑鱼幼鱼生长性能、代谢酶活性及非特异性免疫的影响。结果表明: 1) 养殖密度对黄姑鱼幼鱼的增重率没有显著性影响(P>0.05)。特定生长率具有与增重率相类似的变化规律。饵料系数与养殖密度呈显著的负相关性:FCR=0.02G+0.11(n=15,R2=0.983,F<0.05)。2) G60组乳酸脱氢酶活性最高并显著高于G15组、G30组(P<0.05)。随着养殖密度的增大,谷丙转氨酶活性有逐渐增大的趋势(P>0.05)。谷草转氨酶活性具有与谷丙转氨酶相类似的变化规律。3) 随着养殖密度的增大,血清溶菌酶活性呈现逐渐降低的趋势,G60组血清溶菌酶活性最低并显著低于其他3组(P<0.05)。密度胁迫对血清补体C3、C4含量的影响均不显著(P>0.05)。本研究表明,养殖密度过高会对黄姑鱼幼鱼的代谢及非特异性免疫造成负面影响,而养殖密度过低又会造成水资源的浪费,30尾/缸(3.00kg/m3)为较适宜的养殖密度。  相似文献   

8.
本研究拟通过养殖实验确定厚颌鲂(Megalobrama pellegrini)幼鱼最适养殖密度;同时,利用酶学和分子生物学手段分析养殖密度对厚颌鲂幼鱼肠道抗氧化酶活性及氧化应激相关基因表达的影响。实验设计5个密度处理组,分别为0.15 kg/m3(50尾/桶)、0.24 kg/m3(80尾/桶)、0.34 kg/m3 (110尾/桶)、0.42 kg/m3(140尾/桶)和0.50 kg/m3(170尾/桶),每组设置3个平行,实验周期为42 d。结果显示,当养殖密度从0.15 kg/m3逐渐升高到0.50 kg/m3时,厚颌鲂幼鱼生长(增重率和特定生长率)呈先上升后下降的趋势,且在最大密度时(0.50 kg/m3)增重率和特定生长率显著低于0.34 kg/m3密度实验组(P<0.05)。同时,最高养殖密度处理组(0.50 kg/m3)饲料系数显著高于中低密度实验组(0.15、0.24和0.34 kg/m3) (P<0.05),说明过高养殖密度不利于厚颌鲂幼鱼的生长和饲料利用。实验表明,提高养殖密度并未影响厚颌鲂幼鱼成活率(P>0.05),各组存活率均较高(>97%)。当养殖密度为0.34 kg/m3时,厚颌鲂幼鱼全鱼粗蛋白和粗脂肪含量显著高于其他各密度实验组(P<0.05)。厚颌鲂幼鱼肠道抗氧化应激相关指标受到养殖密度的显著影响,其中,0.24和0.34 kg/m3密度处理组鱼体肠道总抗氧化能力显著高于最低密度组(0.15 kg/m3)和高密度组(0.42、0.50 kg/m3)(P<0.05);最高密度实验组(0.50 kg/m3)肠道超氧化物歧化酶(SOD)和过氧化氢酶(CAT)活性最低,而丙二醛(MDA)含量最高(P<0.05);谷胱甘肽(GSH)含量最高值出现在0.34 kg/m3处理组,显著高于其他各实验组(P<0.05)。最低密度实验组(0.15 kg/m3)厚颌鲂幼鱼肠道细胞色素P450 (CYP1 A)基因相对表达量显著低于较高密度实验组(0.42 kg/m3)(P<0.05);最高养殖密度组(0.50 kg/m3)鱼体肠道转录因子NF-E2相关因子2 (Nrf2)基因相对表达量最高,而锰超氧化物歧化酶基因(MnSOD)相对表达量最低,与0.34 kg/m3密度处理组间有显著性差异(P<0.05),说明养殖密度过高时能引起鱼体的氧化应激反应。研究表明,体重为0.45~1.36 g的厚颌鲂幼鱼最适养殖密度为0.34 kg/m3,该结果可为提高厚颌鲂苗种培育效率,促进其种质资源恢复提供理论基础。  相似文献   

9.
7至8月份,南方海域的气温逐渐升高。网箱养殖军曹鱼幼鱼经过一个多月的饲养,每尾可以增重200克,这时可以转入较大网目的网箱进行饲养。随着的幼鱼迅速生长,体型差距明显增大,应注意定期筛选,将不同大小的个体分开饲养,以提高养殖存活率。放养参考密度如下:(数据来自黎祖福等《南方海水鱼类繁殖与养殖技术》)  相似文献   

10.
研究了养殖密度对长薄鳅稚鱼生长的影响。养殖密度分别为1、2、4、8尾/L,经过28d的养殖试验发现,养殖密度在1-4尾/L之间,长薄鳅稚鱼的最终体重、特定生长率、日增重都随着养殖密度的增大而升高,进一步增加养殖密度(8尾/L),稚鱼的生长反而下降,饵料转化率和净增重却随养殖密度的增加而增加。高密度组(4、8尾/L)长薄鳅稚鱼个体生长速度离散度明显加大,稚鱼的成活率也随养殖密度的增加而下降。  相似文献   

11.
选用初始体质量约8.50 g的草鱼(Ctenopharyngodon idella),在56 d的饲养期中分别投喂添加5种不同剂量谷胱甘肽(GSH)(添加量分别为0 mg/kg、100 mg/kg、200 mg/kg、300 mg/kg和400 mg/kg)的试验饲料,观察GSH对草鱼生长、生理指标和抗病力的影响。结果表明,饲料中添加GSH能够提高草鱼特定生长率、存活率和饲料效率。其中,300 mg/kg GSH组草鱼的特定生长率和400 mg/kg GSH组草鱼的存活率显著高于对照组;添加GSH各组草鱼的饲料效率均显著高于对照组,当添加量为200 mg/kg时草鱼饲料效率达到最高。与对照组相比,饲料中添加GSH的各组草鱼肝胰指数明显升高,其中200 mg/kg组达到显著水平。饲料中添加GSH能够提高血清IGF-1水平,其中300 mg/kg和400 mg/kg组显著高于对照组。与对照组相比,各实验组草鱼血液白细胞数目有不同程度升高,其中300 mg/kg和400 mg/kg组均达到显著水平。饲料中添加GSH可以提高草鱼对嗜水气单胞菌的抵抗能力,其中200 mg/kg GSH组草鱼攻毒后存活率达到最高。以特定生长率为判定指标,GSH在草鱼饲料中的适宜添加量为350 mg/kg。  相似文献   

12.
Abstract. A preliminary study was conducted to assess the performance of the tilapia, Oreochromis spilurus (Günther), cultured in seawater cages at different stocking densities during the nursing and rearing phases. The stocking densities tested were 200, 400 and 600 fish/m3 during the nursing phase and 100, 200, and 300 fish/m3 during the rearing phase.
In both growth phases, no significant differences (P>0.05) were observed among the different stocking densities on the mean individual final weight, daily growth rate, feed conversion ratio and survival rate. Yields in cages stocked with 400 and 600 fish/m3 during the nursing phase, however, were significantly (P<0.05) higher compared with cages stocked with 200 fish/m3. No significant differences (P>0.05) were observed between 400 and 600 fish/m3. A density of 600/m3 is therefore considered to be optimum for the nursing phase.
Yields of cages during the rearing phase increased significantly (P<0.01) with the increase in stocking density. After grading the fish, however, no significant differences (P>0.05) were observed when only fish bigger than 150g were considered. The occurrence of exophthalmia (cataract) was observed in two of the four replicates at the highest stocking density (300 fish/m3) during the rearing stage. Therefore, a stocking density of 200 fish/m3 is considered optimum for the rearing phase.  相似文献   

13.
叶黄素对七彩神仙鱼生长和体色的影响   总被引:1,自引:0,他引:1       下载免费PDF全文
为研究叶黄素对七彩神仙鱼体色和生长的影响,在"牛心汉堡"饲料中分别添加0、50、100、200、300和400 mg/kg叶黄素,饲喂初始平均体质量(10.3±0.3)g的七彩神仙鱼8周。结果显示,添加叶黄素50~200 mg/kg,对鱼体增重率无显著影响,但添加量达200 mg/kg后,饲料系数显著增大,添加量达300 mg/kg后,增重率显著降低。在养殖4周、8周时,鱼体皮肤亮度(L*)无显著变化,皮肤黄度(b*)和叶黄素含量随叶黄素添加量增加而显著升高;8周时,各叶黄素添加组的皮肤b*值和叶黄素含量显著高于4周时,当叶黄素添加量达300 mg/kg后,皮肤b*值(4周、8周)和全鱼叶黄素含量(8周)趋于稳定;4周时,各处理组间的皮肤红度(a*)无显著差异;8周时,当叶黄素添加量达100 mg/kg后,皮肤a*值显著降低;饲料中添加300 mg/kg叶黄素显著提高了七彩神仙鱼肝脏总抗氧化能力。研究表明,在饲料中添加叶黄素可有效改善七彩神仙鱼体表黄色,提高肝脏总抗氧化能力,但高添加量的叶黄素会降低鱼体生长性能,七彩神仙鱼饲料中的叶黄素添加量建议为200~300 mg/kg。  相似文献   

14.
Juvenile channel catfish were fed purified diets supplemented with magnesium (Mg) from Mg sulfate at levels of 0, 200, 400, 600, 800, and 1,000 mg/kg and 0, 200, 400, 600, and 800 mg/kg in two separate feeding studies. In study I, the effect of dietary levels of Mg on growth response, vertebral mineral content, and macrophage chemotaxis were evaluated. Study II had similar objectives except that whole body mineral content was measured, and resistance of channel catfish to Edwardsiella ictaluri challenge was also determined. Fish with an average weight of 10.89 g were stocked at a rate of 50 fish/110‐L aquarium (study I). In study II, fish with an average weight of 4.14 g were stocked at rates of 40 fish/110‐L aquarium. Prior to stocking, each batch of fish was acclimated to laboratory conditions and fed the basal diet for 2 wk. The concentration of Mg in rearing water was 1.8 mg/L. Each diet was fed to fish in quadruplicate and triplicate aquaria to apparent satiation for 10 wk for studies I and II, respectively. Fish fed the basal diet started to die as early as 3 d after the study began (17 d of feeding the diet without Mg supplementation). In both studies, weight gain, survival, and feed efficiency were lowest for fish fed the basal diet but increased with increasing dietary levels of Mg. However, the differences between the values of each of these parameters for fish fed diets containing supplemental Mg were not always significant. Magnesium‐deficiency signs observed were anorexia, sluggishness, convulsions, deformed snout, vertebral curvature, muscle flaccidity, and high mortality. Vertebral and whole body ash concentrations were high, but Mg content was low for fish fed the basal and the 200‐mg Mg diets. Bone Ca content did not differ among fish fed different diets (study I), but whole body Ca tended to increase for fish fed the basal diet, suggesting the possibility of calcification of soft tissues. Macrophage chemotaxis in the presence of exoantigen was highest for fish fed diets supplemented with Mg at 400 and 200 mgkg for studies I and II, respectively. When expressed in terms of chemotaxis index, however, maximum or near maximum value was observed at a dietary Mg level of 400 mg/kg. Thus, a dietary level of Mg of 400 mg/kg from Mg sulfate was required for optimum growth and survival, maintaining high tissue levels of Mg, prevention of muscle flaccidity and skeletal deformity, and stimulating macrophage chemotaxis. Dietary levels of Mg had no effect on the resistance of juvenile channel catfish to Edwarsiella. ictaluri challenge.  相似文献   

15.
The results of two stocking density trials on the nursery and grow-out stages of Epinephelus tauvina (Family: Serranidae), in PVC-lined raceways are presented.
At the nursery stage, fry of 17.1 g initial mean weight showed no significant differences in growth rate, survival rate and condition factor when stocked at densities of 200 and 400 fish/m3 over a period of 52 days. Fish grew to mean weights of 61.7 and 63.7 g, giving growth rates of 0.86 and 0.90 g/fish/day and final biomasses of 12.1 and 2S.2 kg/m3 for densities of 200 and 400 fish/m3, respectively. Survival rates were excellent for both treatments at 98percnt; or greater. Food conversion efficiency was slightly improved at the higher density.
At the grow-out stage, E. tauvina of mean weights ranging from 150-170 g cultured for a period of 215 days grew better at a density of 5 fish/m3 than at densities of 20 and 60 fish/m3 (final size: 770, 560 and 450 g with growth rates of 2.8, 1.8 and 1.4 g/fish/day, respectively). Survival rates were higher at the two lower densities. Overall, total biomass increased with stocking density (3.9, 11.1 and 23.4 kg/m3, for 5, 20 and 60 fish/m3, respectively). These results indicate that hamoor has potential to be successfully cultured in raceways.  相似文献   

16.
为探讨外源激素对半滑舌鳎性腺发育、体长增长及存活率的影响,用雌二醇和甲基睾酮分别处理半滑舌鳎幼鱼,各设200μg/L,400μg/L,500μg/L三个浓度进行浸浴处理,以乙醇处理作为阴性对照组,未做任何处理的作为空白对照组,统计各组存活率并在实验的不同时间段分别观察实验鱼的体长的变化;激素处理30 d后,每隔5 d每组取样5尾,通过组织学H.E染色观察各实验组幼鱼性腺的发育情况。结果表明,在甲基睾酮和雌二醇的诱导下,半滑舌鳎幼鱼的生长情况均受到一定程度的抑制,雌二醇在半滑舌鳎幼鱼发育早期对其卵巢发育具有一定的促进作用,而甲基睾酮则起到了抑制的作用。  相似文献   

17.
本研究尝试将生物絮团养殖技术(Bio-floc aquaculture technology, BFA)应用到凡纳滨对虾高密度养殖系统中,研究生物絮团在凡纳滨对虾不同放苗密度下的水质调控、对虾生长及存活等方面的作用效果。试验将200、400和600尾/m2的放苗密度分为传统养殖组(TF200、TF400和TF600)和絮团养殖组(BFA)(BF200、BF400和BF600)共6组,分别在18个室内水泥池中进行,其中BFA组通过添加益生菌和赤砂糖培养生物絮团,并在养殖过程中极少换水,而传统养殖组进行传统换水养殖管理。经过113d的养殖试验,随着放苗密度的增加,水质、对虾存活率和对虾特定增长率逐步下降,然而BFA在400尾/m2的凡纳滨对虾封闭式养殖中有良好效果。与400尾/m2的传统养殖组(TF400)相比,400尾/m2的BFA组(BF400)在养殖过程中生物絮团平均形成量提升3.25倍;水体中的亚硝酸氮和氨氮平均含量分别降低67.9%和72.7%,而用水量只有传统养殖组的33%左右;对虾的体重、存活率、特定生长率及单位产量分别提高了14.5%、156.3%、2.4%和194.1%;400 尾/m2的BFA组对虾单位产量达到4.01±0.94 kg/m2,具有最好的环境和产出效应。  相似文献   

18.
The effects of dietary bovine lactoferrin (LF) on the growth, haemato‐biochemical parameters, non‐specific serum immunity and stress responses were investigated in the African cichlid, Sciaenochromis fryeri. Four isocaloric diets containing 0 (control), 200, 400 and 800 mg LF kg?1 diet were formulated and fed to juvenile fish for 8 weeks. The treatments had no effects on the survival rate, growth performance or haematological parameters. Nor were the serum levels of total protein, albumin and globulin significantly influenced. Serum iron levels and total iron binding capacity (TIBC), however, changed vigorously as the result of dietary LF. Dietary LF led to significant reductions in serum levels of alanine transaminase and alkaline phosphatase. The highest lysozyme and bactericidal activities were observed in the fish fed the diets with 200 and 800 mg/kg of LF, respectively, while no changes were observed in their ACH50 levels. Recovery rates were measured after 10 min of air exposure stress. The rate was about twice higher (36% vs 20%) in fish fed on 400 mg LF than in those fed the control diet. Results revealed that adding 400 mg/kg LF could be beneficial as an iron discriminator, for liver function as well as an immune and stress resistance promoter.  相似文献   

19.
The effects of four levels of diffused aeration (0, 6, 12, and 24 hours/day) and two stocking densities (400 and 600 fish/m3) on the culture performance of caged Florida red tilapia were evaluated in 1 m3 cages in a 2 ha watershed pond on St. Croix, U.S. Virgin Islands. Fish obtained a nutritionally-complete (36% protein), floating feed from demand feeders for 143 to 146 days. Diffused aeration had no significant ( P > 0.05) effect on fish growth, survival, feed conversion, and production in cages. Combined across all levels of diffused aeration, fish stocked at 400/cage had a greater growth rate (2.21 vs. 1.97 g/day), larger final body weight (370 vs. 335 g), and a lower feed conversion ratio (1.69 vs. 1.80) than fish stocked at 600/cage ( P < 0.05). The final biomass of fish stocked at the higher density (181 kg/m3) was greater than at the lower density (140 kg/m3). The enhancement of water exchange rates by diffused aeration did not increase tilapia growth rate or production in cages.  相似文献   

20.
王知行  任兰兰  韩潇宇  高坚 《水产学报》2023,47(10):109615-109615
通过研究不同饲料维生素C(VC)含量对大口黑鲈仔鱼生长、免疫和抗氧化能力的影响,探究其维生素C最适需求量,为维生素C在大口黑鲈仔鱼饲料中的应用提供科学依据。实验设计5个实验组,分别为0(VC0)、200(VC200)、400(VC400)、800(VC800)和1600(VC1600)mg/kg。以出膜后11日(体重为1.2±0.3 mg)的大口黑鲈仔鱼为研究对象,在工厂化循环水系统进行为期3周的投喂实验。结果表明:大口黑鲈仔鱼的终末体重、增重率、特定生长率均随饲料中维生素C添加水平的提高先升高,其中VC400组数值最高。通过折线模型分析维生素C添加水平与增重率的关系,大口黑鲈仔鱼饲料中维生素C最适添加水平为421.2 mg/kg。各组生长激素和类胰岛素生长因子1的mRNA表达水平的变化趋势和生长性能基本一致。各维生素C添加组的补体浓度无显著差异,但都显著高于VC0组,补体C3与补体C4浓度均在VC1600组达到最大值。在溶菌酶含量中,VC400组、VC800组与VC1600组含量无显著差异,显著高于VC0组与VC200组。各组过氧化氢酶活性、谷胱甘肽含量、超氧化物歧化酶活性均随添加水平的提高先升高,均在VC400组取得最大值。各组的碱性磷酸酶活性和体内维生素C含量随饲料维生素C添加量的升高而升高,丙二醛含量随饲料维生素C添加量的升高而降低。综上所述,饲料中添加420mg/kg维生素C可以有效提高大口黑鲈仔鱼的生长性能、免疫性能和抗氧化性。  相似文献   

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