Compensatory growth response of European sea bass (Dicentrarchus labrax L.) under cycled starvation and restricted feeding rate     

Serhat Türkmen  Orhan Tufan Eroldoğan  Hatice Asuman Yılmaz  Abdüllatif Ölçülü  Gül Ayten Kiriş Inan  Zeynep Erçen  Nazmi Tekelioğlu 《Aquaculture Research》2012,43(11):1643-1650

The compensatory growth response of the European sea bass (Dicentrarchus labrax) that faced cycling starvation and restricted ration was assessed. Juveniles (10.5 g) were stocked into 15 tanks at a density of 25 fish per tank. Five different feeding regimes were tested on triplicate groups of fish: C_Satiation: control fed for 60 days without deprivation, C_Restricted: 25% restricted feeding, S‐R: 1 day starvation then 4 days C_Restricted feeding, R‐F: 1 day C_Restricted feeding then 4 days C_Satiation feeding, and, finally, S‐F: 1 day starvation then 4 days C_Satiation feeding. The specific growth rate of fish in the C_Satiation (2.5 ± 0.06% day^?1), S‐F (2.5 ± 0.11% day^?1) and R‐F (2.4 ± 0.18% day^?1) were significantly higher than that of C_Restricted (2.2 ± 0.05% day^?1) or S‐R (2.0 ± 0.01% day^?1). Fish in S‐F group were able to achieve catching up with the C_Satiation. There was no significant difference in feed conversion rates but R‐F and S‐F consumed approximately 34% more feed than C_Satiation following the first re‐feeding day. Although, the highest lipid content was observed in C_Satiation (14.4%), S‐R (33.3% dry matter) had the highest water content compared with the C_Satiation and C_Restricted (37.8% and 36.9% dry matter respectively). In conclusion, it may be concluded that sea bass has rapid response to cycling starvation/re‐feeding and that a 25% restricted feeding ratio is insufficient to invoke a compensatory growth response in sea bass.  相似文献   

中华鳖不同生态养殖模式对池塘水环境及养殖效果的影响   总被引：1，自引：0，他引：1  

田功太  巩俊霞  张金路  杜兴华  刘飞  张明磊  段登选 《水生态学杂志》2012,33(3):96-100

利用条件相近的两组池塘,对中华鳖(Trionyx sinensis)的两种生态模式(Ⅰ组:中华鳖-吃食性鱼类鲤和草鱼模式;Ⅱ组:中华鳖-杂食性水生动物鲫和螺模式)对池塘水环境以及养殖效果的影响进行对比试验。结果表明,Ⅱ组CODMn在7、8、和9月显著低于Ⅰ组(P<0.05),NH3在6、7、8和9月显著低于Ⅰ组(P<0.05),TP在7月和8月显著低于Ⅰ组(P<0.05),TN在6、7和8月显著低于Ⅰ组(P<0.05),NO2--N在6月和7月显著低于Ⅰ组(P<0.05),Ⅱ组水环境质量较Ⅰ组好。Ⅱ组检出藻类47种,Ⅰ组34种,Ⅱ组种类显著增多(P<0.05);Ⅰ组蓝藻重量占83.18%,硅藻2.98%,隐藻2.65%,甲藻0%,Ⅱ组蓝藻58.59%,硅藻13.44%,隐藻14.00%,甲藻7.07%,Ⅱ组蓝藻明显下降,而硅藻、隐藻、甲藻明显上升(P<0.05)。6月Ⅰ组平均生物量4.18mg/L,Ⅱ组2.57mg/L,8月Ⅰ组29.04mg/L,Ⅱ组5.41mg/L,6月和8月Ⅰ组生物量均显著高于Ⅱ组(P<0.05)。Ⅰ组Shannon-Wiener指数H’在6月和8月均值分别为2.117和0.7467,Ⅱ组均值分别为2.5427和1.0178,Ⅱ组6月和8月H’均明显增加(P<0.05);在6月,Ⅱ组Margalef丰富度指数d为1.8516,Ⅰ组为1.2499,Ⅱ组较Ⅰ组上升明显(P<0.05);两组的Pielou匀度均指数J差别不大。Ⅱ组中华鳖平均产量11782.5kg/hm2,显著高于Ⅰ组11482.5kg/hm2(P<0.05)。  相似文献   

马拉硫磷和甲氰菊酯对萼花臂尾轮虫生殖的影响     

陆正和  吴建新  罗刚 《水生态学杂志》2012,33(3):122-127

研究了不同浓度马拉硫磷(malathion)(0.03、0.3、3.0、30.0、300.0、3000.0μg/L)和甲氰菊酯(fenpropath-rin)(0.004、0.04、0.4、4.0、40.0、400.0μg/L)对萼花臂尾轮虫(Brachionus calyciflorus)3d种群增长率、携卵雌体数/非携卵雌体数、混交雌体百分率、混交雌体受精率及7d休眠卵产量影响。结果表明,马拉硫磷、甲氰菊酯对种群增长率、混交雌体百分率、混交雌体受精率及7d休眠卵产量有显著影响;马拉硫磷对携卵雌体数/非携卵雌体数无显著影响,但甲氰菊酯有显著影响。马拉硫磷对轮虫休眠卵产量最低效应浓度(LOEC)为0.3μg/L,对混交雌体百分率LOEC为30.0μg/L,对种群增长率和混交雌体受精率LOEC为300.0μg/L;甲氰菊酯对轮虫休眠卵产量最低效应浓度0.04μg/L,对混交雌体百分率和携卵雌体数/非携卵雌体数LOEC为4.0μg/L,对种群增长率和混交雌体受精率LOEC为40.0μg/L。试验显示,马拉硫磷和甲氰菊酯对轮虫生殖存在差异,轮虫休眠卵产量可以用来监测和评价2种杀虫剂潜在的影响。  相似文献   

Spirulina as a natural carotenoid source on growth, pigmentation and reproductive performance of yellow tail cichlid Pseudotropheus acei     

Betül Güroy  ?zzet ?ahin  Serhan Manto?lu  Selin Kayal? 《Aquaculture International》2012,20(5):869-878

A feeding trial on yellow tail cichlid Pseudotropheus acei (Regan 1922) was undertaken to asses the effect of dietary Spirulina meal as a natural carotenoid source. Four experimental diets were formulated to progressively replace 0% (C), 2.5% (SP2.5), 5% (SP5) and 10% (SP10) of fish meal weight. Ten fish per tank (initial weight 3.75?±?0.02?g) were randomly distributed into twelve 80?l fiberglass tanks connected to a closed recirculation system (temperature 26.7?±?0.06°C). The diets were tested in triplicate for 12?weeks. The specific growth rate of fish fed all Spirulina diets were significantly higher compared to diet C. Feed intake (FI) tended to increase with dietary Spirulina level, and fish fed diet SP10 had significantly higher FI values compared to diet C. No significant differences in feed conversion ratio were observed among these groups. Although the protein efficiency ratio of fish fed diet C was lower than that of all Spirulina diets, no significant differences were observed among these groups (P?>?0.05). The total egg production and hatching rate (%) of eggs derived from all fish fed with Spirulina diets was significantly higher compared those from fish fed diet C. The yellow and blue coloration of yellow tail cichlid fed the diet containing Spirulina meal was enhanced and inclusion of dietary Spirulina meal was elevated carotenoids in skin. Results of the present study indicated that Spirulina meal has the potential to enhance the growth, reproductive performance and coloration on yellow tail cichlid.  相似文献   

Effects of stocking density on survival,growth and biochemical composition of cultured mussels (Mytilus galloprovincialis,Lamarck 1819) from an offshore submerged longline system          下载免费PDF全文

Sedat Karayücel  Meryem Yeşim Çelik  İsmihan Karayücel  Recep Öztürk  Bora Eyüboğlu 《Aquaculture Research》2015,46(6):1369-1383

This study examined an offshore submerged mussel longline system, in the Black Sea, from May 2009 to May 2010. The system was allowed 1 year for spat collection. After a 1‐year spat collection period, some spat collectors were left untouched (NS), and some spat collectors were grazed and socked (S) for a grow‐out study in May 2009. The effects of stocking density on the growth and survival of the S and NS mussels were examined. The biochemical composition of the mussels was also determined. Environmental factors including temperature, salinity, chlorophyll a, total suspended matter, inorganic matter and organic matter were monitored monthly during the experimental period. In May 2010, the mean length and live weight of the S and NS mussels were 60.46 ± 0.60 mm and 53.34 ± 0.37 mm, respectively, and 20.50 ± 0.50 g and 13.11 ± 0.26 g respectively. Mean moisture and ash were 82.35 ± 0.47% and 6.67 ± 0.44% respectively. Mean carbohydrate, protein and lipid were 27.74 ± 2.40%, 57.68 ± 2.15% and 7.91 ± 0.68% respectively. These results indicate that a submerged offshore mussel culture system in the Black Sea can be commercially convenient. In addition, stock management via thinning out of the spat can considerably increase the marketable size of mussels, reduce harvest time and produce better growth.  相似文献   

Simultaneous Determination of Phorate and Oxyfluorfen in Well Water Samples with High Accuracy by GC-MS After Binary Dispersive Liquid-Liquid Microextraction     

Emel Alkan  Fatih Kapukıran  Elif Öztürk Er  Dotse Selali Chormey  Seyfullah Keyf  Nizamettin Özdoğan  Sezgin Bakırdere 《Water, air, and soil pollution》2018,229(9):298

The potential risk of pesticides to cause harm to humans and other organisms even at trace levels calls for sensitive and accurate analytical techniques for their simultaneous qualitative and quantitative determinations. In this study, a sensitive binary dispersive liquid-liquid microextraction (B-DLLME) strategy was developed for the simultaneous determination of phorate and oxyfluorfen by gas chromatography mass spectrometry after extraction/preconcentration from aqueous solution. An experimental design was used to optimize parameters of the B-DLLME method to obtain maximum outcome. Under the optimum conditions of B-DLLME, the limit of detection (LOD) for phorate and oxyfluorfen were found to be 0.41 μg L^?1 and 0.54 μg L^?1, respectively. The detection limits correlate to about 37 and 73 folds enhancement in detection powers when compared to direct GC-MS determination of phorate and oxyfluorfen, respectively. In order to find out the applicability of developed method to real samples, recovery tests were performed for 20 μg L^?1 of phorate and oxyfluorfen spiked in well water samples. Percent recovery values were found to be 94.5% for phorate and 101.9% for oxyfluorfen.  相似文献   

Ceratocystis platani is killing plane trees in Istanbul (Turkey)          下载免费PDF全文

A. Lehtijärvi  F. Oskay  H. T. Doğmuş Lehtijärvi  A. G. Aday Kaya  F. Pecori  A. Santini  S. Woodward 《Forest Pathology》2018,48(1)

Ceratocystis platani was detected at several locations in the European side of Istanbul, causing severe dieback and mortality, mainly on Platanus × acerifolia imported from Italy approximately 160 years ago, but also on Platanus orientalis. In the work reported here, the causal agent of the dieback and mortality was identified based on morphological characteristics in culture and internal transcribed spacer (ITS) sequencing, confirming the presence of C. platani in Turkey. All analysed C. platani isolates from Istanbul shared the same ITS sequence with European C. platani strains available in the NCBI, but differed from other species previously ascribed to the Ceratocystis fimbriata species complex. Pathogenicity of C. platani was proven by inoculation onto 25‐cm‐long and 4–9 mm diam. P. orientalis twigs and the causal agent reisolated from symptomatic tissues. In a survey of 976 Platanus in streets and parks of Istanbul, 26.5% of trees showed symptoms of C. platani infections, whilst 5.6% were dead. The proportion of symptomatic trees was higher where management interventions, such as topping or pruning and felling infected trees had been carried out.  相似文献   

Using GGE Biplot Analysis to Evaluate Interrelationships between Yield and Yield Components of Oat Genotypes in Different Growing Seasons     

Mevlüt Akcura  Burcu Sabandüzen  Onur Hocaoğlu 《Journal of Crop Science and Biotechnology》2018,21(5):483-490

The aim of this study was to evaluate oat genotypes for grain yield and yield components in both 2014-2015 and 2015-2016 growing seasons using GGE biplot analysis. Experiments were laid out according to lattice design. Biomass at harvest, grain yield, number of grain per panicle, weight of grain per panicle, flag leaf width, flag leaf height, plant height, stem diameter, thousand kernel weight, time of panicle emergence, harvest index, panicle length, and spikelet per panicle were evaluated for 56 oat genotypes. GGE biplot graphics of the first and second years explained 54.4 and 55% of total variation, respectively. Grain yield, number of grains per panicle, and weight of grain per panicle were closely and positively associated in both growing seasons. Recently registered cultivar Sari and lines 26, 29, and 30 were found as promising genotypes for Çanakkale conditions. Traits of genotype at different growing seasons can be visually studied using different genotype-by-trait (GT) biplots.  相似文献   

烟草丛顶病毒RNA依赖RNA聚合酶(RdRp)介导的体外复制体系     

逯晓明  于成明  王国鲁  王德亚  耿国伟  刘珊珊  师科荣  原雪峰 《植物病理学报》2017,47(6):790-796

通过重叠PCR扩增得到烟草丛顶病毒(Tobacco bushy top virus,TBTV)中国分离物RdRp的编码序列,构建以pMALC2X为基础载体的原核表达载体pMAL-TB-RdRp。0.5 mM IPTG诱导可特异性表达分子量约为120 kDa的MBP-RdRp融合蛋白。温度梯度实验显示,18℃下诱导表达的MBP-RdRp融合蛋白的可溶性比例较高,约17%;经亲和层析纯化的MBPRdRp可特异性识别TBTV正链和负链的3'末端序列,催化体外复制;对正负链的3'末端的体外复制效率存在差别,识别负链3'末端的体外复制效率明显高于正链3'末端。本研究创建的TBTV RdRp介导的体外复制体系为进一步研究TBTV基因组复制调控奠定了基础。  相似文献   

Anaesthesia in a Eurasian lynx with an intranasal zolazepam–tiletamine combination     

Latif Emrah Yanmaz  Elif Doğan  Uğur Ersöz  Zafer Okumuş  Veysel Doğan 《Veterinary anaesthesia and analgesia》2017,44(1):193-194

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