鳌山湾水动力状况研究   总被引：2，自引：1，他引：2  

赵俊  陈聚法 《海洋水产研究》2001,22(3):59-63

通过对鳌山湾海域的潮流数值模拟，较为详细地阐述了鳌山湾的潮汐、潮流征及海水交换率与交换期。结果表明，与其他海湾相比，鳌山湾水交换能力一般。  相似文献   

斑节对虾水质因子耐受性研究   总被引：3，自引：0，他引：3  

林汝榕 《水产科技情报》1989,(3):70-74

在室内条件下进行了斑节对虾短期内对水温、盐度、pH、低氧的耐受性实验。结果表明:该虾类对这几个主要水质因子的耐受能力强。当水质因子呈渐变时,虾对水温、盐度、pH 的耐受极限分别 T:16～39℃,S:2～55‰,pH:6.71～9.04;而在急变情况下,虾对这些参数的耐受性减弱。该虾对低氧的耐受性随不同温、盐度而定,在适宜的温、盐度范围内(T:25～30℃,S:20～35‰),虾对低氧的耐受性最强,此时致死溶解氧的临界值为0.5～1.5ppm,在其它温、盐度,溶解氧为0.9～2.75ppm 时虾即发生侧倒,表明此时对低氧的耐受性下降。  相似文献   

乐清湾滩涂养殖贝类微生物富集及海水净化研究     

金雷  陈雪昌  陈瑜  刘欢  郭远明 《安徽农业科学》2015,43(32)

[目的]探讨不同品种贝类对微生物富集能力的差异以及生长环境水质对贝类富集微生物的影响和海水净化试验微生物变化情况。[方法]抽样检测缢蛏、文蛤、泥蚶中的大肠杆菌和菌落总数;检测贝类生长海水中的粪大肠菌群和细菌总数;净化试验中,每天换水抽样检测缢蛏样品中大肠杆菌和菌落总数,连续抽样检测5 d。[结果]缢蛏、文蛤、泥蚶样品中缢蛏富集大肠杆菌和菌落总数的数值相对较高,文蛤和泥蚶的富集能力没有显著差异;海水中的粪大肠菌群和细菌总数含量越高,则该环境下生长的贝类中大肠杆菌和菌落总数就越高,二者呈一定的正相关;污染的缢蛏随着暂养净化时间的增加,缢蛏中大肠杆菌和菌落总数的数值也随之减少。  相似文献   

Preliminary observations on growth and survival of Oreochromis spilurus x GIFT Oreochromis niloticus F1 reciprocal hybrids in fresh and seawater     

Mohammad T Ridha 《Aquaculture Research》2014,45(3):528-536

Tilapia has a significant potential for culture in saline environments. There is an increasing demand among tilapia producers to develop a tilapia hybrid that can survive well in marine water conditions. This study compared mean weight (MWT), daily growth rate (DGR), specific growth rate (SGR), survival, feed conversion ratio (FCR), condition factor (K), production rate (PR) and rate of skin lesions, and tail and fin rot as well as eye cataract in the Genetically Improved Farmed Tilapia strain (GIFT) of the Nile tilapia, Oreochromis niloticus (NN) and the salt‐tolerant Oreochromis spilurus (SS), and their F₁ reciprocal hybrids; O. niloticus ♀ x O. spilurus ♂ (NS) and O. spilurus ♀ x GIFT O. niloticus ♂ (SN) in freshwater (0 g L^?1) and seawater (40 g L^?1). Fish (3.5 g) were stocked at 150‐fish m^?3 and fed with sea bream pellets (47% protein) for 180 days. Results showed that in seawater, the SN hybrid had the highest values for MWT (165.9 g), DGR (0.9 g fish^?1 day^?1), SGR (2.14% day^?1), survival (96.3%), PR (23.9 kg m^?3) and best FCR (1.53) followed by the NS hybrid and the NN parent. Both hybrids had significantly lower rates of skin lesions and fin and tail rot than the NN genotype. In freshwater, the NN had the highest values for MWT (255.1 g), DGR (1.40 g fish^?1 day^?1), SGR (2.38% day^?1), K (2.13%) and PR (34.9 kg m^?3) followed by the NS and SN hybrids. High estimate of heterosis for MWT (41.3%), DGR (42.5%), SGR (10.7%) and survival (22.1%) was obtained in the hybrids reared in seawater, indicating that a hybrid vigor was produced and the fast growth trait from the GIFT parent was successfully combined with the salinity tolerance trait from the O. spilurus parent. The better growth performance and survival of the SN hybrid in seawater indicate that this hybrid is more suitable for culture in seawater than its reciprocal hybrid.  相似文献   

不同浓度海水对蔬菜种子萌发、生长及其品质的影响     

王贝贝  龚一富  王钰喆  林瑶  王何瑜 《中国蔬菜》2015,1(2):45-49

以普通白菜品种改良京春绿、七宝青、上海抗热605及羽衣甘蓝品种东方绿嫩为试材,研究不同浓度海水(0~100%)对种子萌发、植株生长及其品质的影响。结果表明,供试的4种蔬菜中,改良京春绿耐盐能力最强,当相对海水浓度为40%~60%时,种子萌发率最高(100%),当相对海水浓度为80%时,种子萌发率仍达40%;当相对海水浓度为40%时,改良京春绿、七宝青、上海抗热605及东方绿嫩的可溶性蛋白质、VC、叶绿素(除上海抗热605外)和β-胡萝卜素含量均显著高于对照,可溶性蛋白质含量分别比对照提高了142.5%、99.2%、101.5%和117.5%,叶绿素含量分别比对照提高了59.0%、18.4%和16.8%,VC含量分别比对照提高了101.0%、75.9%、31.2%和5.2%,β-胡萝卜素含量分别比对照提高了77.8%、48.9%、77.5%和51.9%,表明一定浓度的海水可提高水培蔬菜的营养品质。  相似文献   

A method for the detection of bromate in brackish water     

Ryan M. BrookmanAmy M. McClintock  Graham A. Gagnon 《Aquacultural Engineering》2011,45(1):9-12

The objective of this study was to develop a simple yet accurate method for the detection of bromate in brackish water. Typically, bromate is measured by ion chromatography; however, the presence of chloride ions complicates bromate detection using this technique. Where bromide ions are naturally present in the source water to be ozonated, either for drinking water or aquacultural purposes, bromate is formed as a disinfection by-product. As such, the need to measure bromate in brackish water is complicated due to the naturally present chloride ions. The study was carried out in a laboratory setting using a UV-spectrophotometer and an ion chromatograph to verify the results. To examine the robustness of the UV-based method, seven water matrices were used to test the bromate detection method. The bromate method presented herein utilizes a reaction of bromate with iodide followed by detection at a UV absorbance at 352 nm. A key finding from the study was that the concentration of bromate was quickly and accurately determined using spectrophotometry. This method successfully measured bromate in waters containing a broad range of conductivity and avoided interference from other anions. The method detection limit reported for all seven water matrices tested was greater than 0.14 mg L⁻¹, which limits the methods utility to saline solutions.  相似文献   

海水酸化胁迫对紫贻贝能量分配的影响          下载免费PDF全文

王晓芹  Samuel P.S. Rastrick  吴亚林  房景辉  杜美荣  高亚平  蔺凡  姜娓娓  李凤雪  王军威  张义涛  方建光  蒋增杰 《渔业科学进展》2019,40(3):21-30

2016年5～6月在山东桑沟湾楮岛海区,采用野外围隔和现场流水相结合的方法,以紫贻贝(Mytilus galloprovincialis)为研究对象,以pH为8.0作为对照组,探讨了酸化胁迫(p H=7.7)对其能量分配的影响。结果显示,短期(10d)海水酸化胁迫下,紫贻贝的滤水率、同化效率、氧氮比显著下降(P0.05),排氨率极显著增加(P0.01),耗氧率无显著差异(P0.05);中期(30d)海水酸化胁迫下,紫贻贝的滤水率和氧氮比显著下降(P0.05),而同化效率、耗氧率、排氨率显著升高(P0.05)。能量收支的结果显示,短期(10 d)酸化胁迫下,紫贻贝的摄食能和吸收能显著降低(P0.05),呼吸能无显著差异(P0.05),排泄能显著增加(P0.05),生长余力极显著降低(P0.01);中期(30d)海水酸化胁迫下,摄食能降低(P0.05),吸收能、呼吸能、排泄能、生长余力显著升高(P0.05)。氧氮比的结果显示,在海水酸化胁迫下,氧氮比的波动范围为14.28～20.46,贝类体内的供能物质由脂肪和碳水化合物逐渐向蛋白质过渡。研究结果为揭示紫贻贝应对海水酸化胁迫的生理响应提供了基础数据。  相似文献   

不同单养和混养海水实验围隔初级生产力的研究   总被引：3，自引：1，他引：2  

王岩 《水产学报》1999,23(2):138-143

１９９５年和１９９６年夏秋季进行的围隔实验表明投饵养殖时浮游植物毛初级生产力较低,水呼吸相对较高,多数围隔中毛初级生产力／水呼吸〈１,其中混养中国对虾和台湾红罗非鱼的围隔中毛初级生产力较高,而混养中国对虾,台湾红罗非鱼和菲律宾蛤仔的围隔中毛初级生产力最低;在投饵基础上酌情施肥后围隔毛初级生产力同于投饵养殖时,毛初级生产力／水呼吸〉１,但单养中国对虾,对虾与罗非鱼混养和对虾与海湾扇贝或缢蛏混养的围隔  相似文献   

简述泉州市浅海滩涂水产养殖规划     

汪三平  王辉荣  王玉明  方民杰  万为民 《福建水产》2008,(1):83-87

该规划按照养殖类型和养殖品种进行了比较科学合理的调整、配置和布局,对养殖海域进行科学规划,为合理开发利用养殖海域,提高养殖海域利用率,有效保护养殖海域生态环境,加快完善和推进养殖管理制度,为促进水产养殖业的可持续发展提供科学依据.预测实施该规划后,到2015年总养殖面积为16816.75hm2,预计总产值可以达到92.4亿元左右.  相似文献   

近5a北部湾防城港近岸海水重金属的含量分布特征及影响因素     

何祥英 《安徽农业科学》2014,(23):7956-7959

根据2009~2013年夏季北部湾防城港近岸海域环境调查资料,分析讨论了该海域海水中7种重金属的含量分布特征、年际变化趋势及影响因素。结果表明:防城港近岸海水近5a的Cu、Cr、Cd、Pb、As、Hg、Zn的平均浓度分别为2.73、1.08、0.137、1.25、1.43、0.042、21.8μg/L,其中Hg、Cu、Cr、Cd、As符合一类海水水质标准,Zn、Pb属二类海水水质标准范围且接近二类标准下限。近5a各站位重金属综合污染指数绝大部分在0.4~0.7范围区间,重金属综合污染程度较低,总体属清洁水平;在年际变化方面,Zn呈现小幅度逐年下降趋势,Hg呈起伏线性上升趋势,Cu、Cr、Cd、Pb、As除2010年出现高浓度值外,其他年份变化不大;在水平分布方面,Cu、Cd呈东南高西北低的分布特点。Zn、Cr呈现从远岸向近岸湾内梯度递减的趋势,Pb、Hg、As呈现近岸湾内高至远岸湾外低的分布特点。分析控制防城港近岸重金属分布的因素主要有陆源输入影响、海水盐度影响、沉积物释放影响和本底环境影响等4个方面,研究发现防城港近岸海水Zn、Pb、Hg的本底污染值较高。  相似文献