不同水循环率对大菱鲆生长和水质的影响研究   总被引：2，自引：1，他引：1  

田喆  张延青  刘鹰  孙国祥 《渔业现代化》2010,37(6)

研究了封闭循环水养殖系统中不同水循环率对大菱鲆(Scophthalmus maximus)生长和水质变化的影响。试验设置4个水循环率梯度12,24,36,48次/d,大菱鲆初始平均体重为200.36 g。经43 d养殖,12次/d组大菱鲆最终平均体重为277.98 g/尾,而48次/d组达到了296.24 g/尾;12次/d组水体氨氮(TAN)和亚硝酸盐氮(NO2--N)浓度分别为0.41~1.50 mg/L和0.12~0.38 mg/L,而48次/d组分别为0.33~0.56 mg/L和0.05~0.09 mg/L。试验结果显示,提高水循环率可降低系统中氨氮和亚硝酸盐氮的积累速度,优化养殖水质,减小水中有害物质对大菱鲆的胁迫作用,从而加快大菱鲆的生长速度,但对化学需氧量(COD)的去除没有显著影响。  相似文献   

大豆小肽蛋白替代鱼粉对黄颡鱼幼鱼生长性能、消化酶活性和抗氧化功能的影响          下载免费PDF全文

敬庭森  周明瑞  李哲  李玉林  孙文波  梁钧畑  王新靓  叶华  成廷水  罗辉 《渔业科学进展》2021,42(5):149-157

为研究大豆小肽蛋白替代鱼粉对黄颡鱼(Pelteobagrus fulvidraco)生长性能、体成分、消化酶活性和抗氧化功能的影响,以30%鱼粉组为对照组(A0),大豆小肽蛋白分别替代17%、33%和50%的鱼粉作为实验组(A17、A33和A50),配制4种等氮配合饲料。每组设置4个重复,每个重复饲喂30尾平均体重为(3.7±0.6) g的黄颡鱼幼鱼,进行为期80 d的饲养实验。结果显示,A17组生长性能与对照组无显著差异(P>0.05),A33组除增重率(WGR)显著高于对照组外(P<0.05),其余指标均与对照组无显著差异(P>0.05)。A50组饵料系数(FCR)显著高于对照组和其他实验组(P<0.05),增重率、特定生长率(SGR)及蛋白质效率(PER)显著低于对照组和其他实验组(P<0.05)。各实验组肥满度(CF)和脏体比(VSI)与对照组无显著差异(P>0.05)。大豆小肽蛋白替代鱼粉对黄颡鱼全鱼水分、灰分和粗蛋白含量无显著影响(P<0.05);然而,当大豆小肽蛋白替代鱼粉水平从33%升高至50%时,鱼体粗脂肪含量显著降低(P<0.05)。各实验组肠脂肪酶和肠淀粉酶活性显著高于对照组(P<0.05),A33和A50组胃淀粉酶显著高于对照组(P<0.05)。大豆小肽蛋白替代鱼粉对黄颡鱼肝胰脏丙二醛(MDA)活性无影响。综上所述,黄颡鱼配合饲料中鱼粉替代量小于33%时,黄颡鱼生长性能最佳,且对鱼体肝脏抗氧化功能无不利影响。本研究首次探究大豆小肽蛋白替代鱼粉对黄颡鱼生长等的影响,以期为黄颡鱼饲料配制和大豆小肽蛋白的使用等提供参考。  相似文献   

桓仁水库初级生产力和限制性营养盐研究     

苑俊杰  赵文  王安璞  刘钢  魏杰  庞雨佳  王哲  王圣云 《水产科学》2020,39(3):438-446

2018年4月10日、6月11日、8月14日在桓仁水库的上游(江南九队)、中游(砬砬岗子)和下游(泗河大地)3个站位用500 mL具塞磨口瓶盛装采水器采集的水库水样,进行限制性营养盐原位试验,同时测定水中溶解氧和初级生产力,并检测分析水体理化指标,以查明辽宁桓仁水库氮磷分布、营养盐限制和初级生产力状况,保护桓仁水库生态系统的结构和功能完整性。试验结果显示,营养盐加富试验中,0.5 mg/mL氮+0.3 mg/mL磷的添加组可显著提高水体中的溶解氧水平(P<0.05);上游和中游氮磷比为2∶1、下游氮磷比为4∶1可显著提高水体中的溶解氧水平(P<0.05);初级生产力随季节变化特征明显,原始P/R系数均小于试验组。根据试验结果分析得知,桓仁水库营养盐限制因素受季节变化的影响显著,具有氮、磷双限制等特征;根据初级生产力判断桓仁水库为自养代谢型水体。  相似文献   

Honokiol inhibits Vibrio harveyi hemolysin virulence by reducing its haemolytic activity     

Yi Guo  Zhenyu Xing  Zhe He  Xiaoran Zhao  Shigen Ye 《Aquaculture Research》2020,51(1):206-214

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Effects of bioflocs with different C/N ratios on growth,immunological parameters,antioxidants and culture water quality in Opsariichthys kaopingensis Dybowski     

Zhe Yu  Liang Li  Rui Zhu  Min Li  Li‐Fang Wu 《Aquaculture Research》2020,51(2):805-815

Biofloc technology (BFT) is a new ecological aquaculture technology that is intended not only to eradicate pollutants and elevate feed utilization but also to enhance immunity and antioxidant activity in aquatic animals. A 28‐day feeding trial was implemented to evaluate the effects of promoted bioflocs on the water quality, growth performance, immunological parameters and antioxidant status of Opsariichthys kaopingensis Dybowski juveniles in low exchange culture tanks. Three hundred sixty healthy O. kaopingensis juveniles (7.1 ± 0.02 g) were irregularly distributed among 12 tanks. Four C:N ratios in triplicate tanks were tried: C/N = 10.8:1 with a commercial diet (control), C/N = 15:1, C/N = 20:1 and C/N = 25:1. Anhydrous glucose (99.97%) was added to the commercial diet to maintain elevated carbon ratio in the three treatments. Uninterrupted 24‐hr aeration was supplied during the test by using an air‐stone connected to an air pump to develop the bioflocs in the water column. The results indicated that BFT significantly reduced total ammonia nitrogen (TAN), nitrite (NO2^?‐N), total phosphorus (TP) concentrations and water transparency (Secchi depth) in C/N 15, C/N 20 and C/N 25 (p < .05), whereas the chemical oxygen demand (COD) and nitrate nitrogen (NO3^?‐N) concentrations gradually increased over time. In addition, weight gain, specific growth rate (SGR), survival and protein efficiency ratio (PER) were significantly elevated in C/N 20, while food conversion rate (FCR) was considerably decreased (p < .05) in C/N 20, compared with the control. Significant increases in lysozyme (LSZ), glutamic pyruvic transaminase (GPT), glutamic oxaloacetic transaminase (GOT) and alkaline phosphatase (AKP) activities of O. kaopingensis were found in the C/N 20 group after a 28‐day feeding trial (p < .05). Comparing the antioxidant capacity of O. kaopingensis in gills, brains, kidneys, hepatopancreas, intestines and serum of juveniles from the four experimental groups, the activity of superoxide dismutase (SOD), total antioxidant capacity (T‐AOC), catalase (CAT) activity and glutathione peroxidase (GSH‐PX) activity of juveniles in the C/N 20 group were significant higher (p < .05), and the content of malondialdehyde (MDA) was considerably lower, than in the control. Overall, these findings suggest that BFT not only can enhance O. kaopingensis growth performance and strengthen antioxidant status but also can upgrade immune response, ensuring the sustainable development of aquaculture.  相似文献   

Proliferation dynamics of WSSV in crayfish,Procambarus clarkii,and the host responses at different temperatures     

Nan Jiang  Xiaoyi Pan  Zemao Gu  Wenzhi Liu  Kaige Si  Yong Zhou  Yongze Zhou  Liwen Zhai  Yuding Fan  Lingbing Zeng 《Journal of fish diseases》2019,42(4):497-510

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Differential Gene expression related to morphological variation in the adductor muscle tissues of diploid and triploid fujian oysters,Crassostrea angulata     

Zhen Zeng  Qianglai Tan  Zixia Huang  Bo Shi  Caihuan Ke 《Aquaculture Research》2019,50(12):3567-3578

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杨树栽植初期体内水分含量变化与大斑型溃疡病关系的研究   总被引：1，自引：1，他引：1       下载免费PDF全文

戴玉成  曾大鹏  刘春静  盛素艳 《林业科学研究》1991,(6):692-695

由Dothiorella gregaria Sacc.引起的杨树大斑型溃疡病是辽宁、河北、山西等地区杨树上的重要病害。近几年我们对该病的防治措施进行了研究,发现用截头法种植杨树,对减轻发病程度,提高造林成活率及生长量均有显著作用。在研究这种栽培技术的防病原理过程中,我们首先对树体内各部位水分的变化与发病的关系进行了探讨。  相似文献   

油茶19个高产新品种的选育研究   总被引：20，自引：4，他引：20       下载免费PDF全文

庄瑞林  黄爱珠  董汝湘  王德斌  陈永忠  蔡肖群  苏明媚  邓晓安  匡元玉  曾庆南  贾桂仁 《林业科学研究》1992,5(6):619-627

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阿维菌素与橡胶籽油复配对朱砂叶螨的联合作用     

熊忠华  曾鑫年  黎卓维  张帅  黎卓莹  马莉敏  吴上新 《中国农学通报》2006,22(11):428-428

室内测定了阿维菌素和橡胶籽油对朱砂叶螨的毒力及其复配剂的联合作用。结果表明，阿维菌素和橡胶籽油对朱砂叶螨雌成螨的LC50分别为0.01 μg/ml和1311.81 μg/ml；阿维菌素与橡胶籽油复配对朱砂叶螨成螨增效作用显著，共毒系数最高为293.90；阿维菌素及其与橡胶籽油最优复配剂对经药剂处理螨卵孵化的若螨具有显著的杀灭活性，且相同浓度下复配剂显著优于阿维菌素单剂，但两药剂对螨卵的直接毒杀活性均很低。阿维菌素与橡胶籽油复配剂这一高效、安全生物农药在害螨防治中极具应用前景。  相似文献