首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 62 毫秒
1.
陡河水库电厂热排水的渔业效应   总被引:1,自引:0,他引:1  
董方勇 《水产学报》1996,20(4):384-387
陡河水库电厂热排水的渔业效应董方勇(水库渔业研究所,武汉430073)关键词热排水,鱼类,电厂,水库EFFECTSOFTHERMALWATERDISCHARGEFROMTHEPOWERPLANTONFISHERIESINDOUHERESERVOIR¥...  相似文献   

2.
INGESTIONANDEXCRETIONOFSEVERALANTIBACTERIALDRUGSBYTHEBRINESHRIMP(ARTEMIAPARTHENOGENETICA)1.TOXICITYTOARTEMIA,INGESTIONANDEXCR...  相似文献   

3.
闽南渔场大黄鱼年间生殖群体组成相似程度的模糊识别   总被引:2,自引:1,他引:1  
张澄茂 《水产学报》1994,18(4):335-339
闽南渔场大黄鱼年间生殖群体组成相似程度的模糊识别张澄茂(福建省水产研究所,厦门361012)关键词闽南渔场,大黄鱼,生殖群体,模糊识别AFUZZYDISTINGUISHABILITYONSIMILARDEGREEOFCOMPOSITIONOFSPAW...  相似文献   

4.
罗非鱼饲料中海带渣含量对氨基酸表观消化率的影响EFFECTOFLAMINARIARESIDUESONAPPARENTDIGESTIBILITYOFAMINOACIDSINDIETOFOREOCHROMISNILOTICUS甘纯玑彭时尧施木田(福建农业...  相似文献   

5.
增殖太湖新银鱼水体主要生态因子的研究   总被引:13,自引:0,他引:13       下载免费PDF全文
增殖太湖新银鱼水体主要生态因子的研究RESEARCHOFMAINECOLOGICALFACTORSOFWATERSINWHICHNEOSALANXTAIHUENSISHAVEBEENMULTIPLICATED王玉芬盖玉欣(中国水产科学研究院淡水渔业研...  相似文献   

6.
渤海鲈食性初步研究APRELIMINARYSTUDYONFEEDINGHABITSOFLATEOLABRAXJAPONICUSINTHEBOHAISEA李绪兴(中国水产科学研究院,北京100039)LiXuxing(ChineseAcademyofF...  相似文献   

7.
长江口水质污染及生物残毒状况调查   总被引:7,自引:0,他引:7  
姚野梅 《水产学报》1995,19(3):280-287
长江口水质污染及生物残毒状况调查INVESTIGATIONONTHESTATEOFTHEWATERPOLLUTIONANDTHERESIDUALTOXICITYINORGANISMINCHANGJIANGRIVERESTUARY¥YaoYemeian...  相似文献   

8.
近年来中国淡水渔具的研究成果及今后的研究方向   总被引:1,自引:0,他引:1  
近年来中国淡水渔具的研究成果及今后的研究方向ASURREYOFRESEARCHACHIEVEMENTSOFCHINAINFRESHWATERONFISHINGGEARSANDANEXPLORATIONONGUIDELINESFORFUTURERESE...  相似文献   

9.
VARIATIONSOFCOMMUNITYSTRUCTURE,DIVERSTITYANDBIOMASSOFDEMERSALFISHASSEMBLAGEINTHEBOHAISEABETWEEN1982~1983AND1992~1993JinXiansh...  相似文献   

10.
分光光度法测定褐藻酸钠纯度的研究   总被引:5,自引:0,他引:5  
分光光度法测定褐藻酸钠纯度的研究ANALYSISOFTHESUDIUMALGINATEPURITYWITHSPECTROPHOTOMTRYMETHOD乔向英过绍武(中国水产科学研究院黄海水产研究所,青岛266071)QiaoXiangyingGuoS...  相似文献   

11.
Elevated carbon dioxide concentrations reduce feed intake and growth in several fish species and induce stress responses. In this study, the effects of moderately elevated CO2 levels on performance, energy partitioning, swimming activity and stress response in European seabass were assessed. European seabass (140.0 g) were reared under two levels of CO2 (1.6 and 7.0 mg L?1) and two feeding levels (FLs) (maintenance and satiation) for 60 days, and fish swimming speed was recorded. At the end of the experiment, fish were subjected to an acute stress test. Blood cortisol, glucose and lactate were analysed. Energy and nitrogen balances were quantified based on measurements of body composition and digestibility coefficients. Moderately elevated chronic CO2 level did neither affect energy requirements for maintenance nor the utilization of digestible energy for growth. However, swimming activity data suggests that FL dependent alterations in energy partitioning took place. Blood cortisol values after the acute stress were affected by additional CO2 exposure and this effect was also dependent on FL. The elevated CO2 exposure of 7.0 mg L?1 appears to act as a chronic stressor as adaptive responses took place, however, this CO2 exposure seems to be still within the allostatic load of the fish.  相似文献   

12.
2019年5月、8月和11月,在上、中、下游共设5个采样点,采用单层刺网(网目1、2、3 cm,网长20、30、40 m)和地笼网(开口40 cm×40 cm,长8 m)调查新疆天山南麓中段塔里木河流域九大水系之一的渭干河(N 41°06′~42°42′,E 80°40′~84°10′)的鱼类资源状况。调查共采集鱼类1864尾,总质量47869.05 g,隶属3目6科15属19种。土著鱼类1目4属8种,其中鲤科鱼类3属5种,鳅科鱼类1属3种。外来鱼类3目11属11种,其中鲤科鱼类6属6种,鳅科、鲈科、塘鳢科、虾虎鱼科、鲇科各1属1种。8月捕获鱼类种类最多,共17种。5月捕获渔获物数量和质量最大,占总渔获物数量的38.41%,占总渔获物质量的64.12%。渭干河优势种为斑重唇鱼、、河鲈和麦穗鱼。渭干河上游、下游河段鱼类种类稀少,群落多样性低。与历史数据相比,扁嘴裂腹鱼和重唇裂腹鱼未采集到,其他土著鱼类捕获量低,外来鱼类捕获量大。通过聚类分析,将5个采样点鱼类分为2类,经过单因子相似性分析得出,这2个群聚之间差异不显著(P>0.05)。将渭干河4种优势种和8种常见种分为2类,经过单因子相似性分析得出,这2个群聚之间差异显著(P<0.05)。外来鱼类入侵和水利工程是影响渭干河鱼类群落的主要因子。  相似文献   

13.
Between 2007 and 2012, a variety of disease outbreaks most often characterized by skin disorders were observed among different species of freshwater fish in Poland. In most cases, the clinical signs included focally necrotized gills, necrotic skin lesions or ulcers. Internally, haemorrhages, oedematous kidney and abnormal spleen enlargement were generally noted. The disorders were accompanied by increased mortality. Most of the problems concerned cultured common carp Cyprinus carpio L. and rainbow trout Oncorhynchus mykiss (Walbaum). Fish have been examined from a number of these farms, and additionally, the wild and ornamental fish with similar clinical signs of diseases were also tested. Bacteria were isolated consistently from lesions and internal organs. They had characteristic orange-pigmented colonies which grew in pure culture or constituted 55–95% of total bacterial flora. One hundred and eighteen isolates were collected and biochemically identified as Shewanella putrefaciens group, and this was confirmed by sequencing. Challenge tests confirmed the pathogenicity of these bacteria. This is the first report characterizing and describing S. putrefaciens as a pathogen of different species of freshwater fish in Europe.  相似文献   

14.
ABSTRACT

The current practice of fish processing generates large amounts of by-products, which can account for up to three-quarters of the total fish weight. Despite the presence of several valuable components in the fish processing discards, the latter are usually dumped into landfills or at sea, having potentially harmful environmental effects or end up as low commercial value products (e.g., white fish meal). Still, fish processing by-products can be considered as an alternative raw material for the preparation of high-protein ingredients, especially for the production of food grade gelatin due to the presence of large amounts of collagen in fish skins, scales, and bones. Although fish gelatin is an alternative to the commercially available mammalian gelatins, its production on a large commercial scale has been hampered, mainly, due to the inferior quality characteristics compared to its mammalian counterparts. This review article summarizes and highlights the potential utilization of by-products generated during fish processing for gelatin extraction. Furthermore, several technical challenges and directions of ongoing research are discussed.  相似文献   

15.
16.
Aquaculture is one of the fastest growing food producing sectors in the world. The increase in the world population requires faster growth in aquaculture for better food availability and to overcome malnutrition. But this worldwide growth of aquaculture is overwhelmed by catastrophic fish diseases and spoilage during cultivation and preservation problems caused by pathogenic bacteria. Various remedies are available for food preservation and also from the bacterial diseases in the fish production. Due to the emergence of antibiotic resistance and adverse effects, an alternative to antibiotic is the need of the hour. The proteins such as bacteriocins, i.e. ribosomally synthesized antimicrobial peptides (AMPs) and possess antagonistic against closely related and other bacteria. These proteins are produced by most lineages of bacteria which are playing key roles in recognition and possess a cognate immunity system for self‐protection as well as host protection from infections. These proteins are potent immunomodulators with broad spectrum inhibition properties which are further used as novel therapeutic agents. In this review, we have tried to summarize the bacteriocins on the basis of their classifications, structural and functional attributes, mode of actions, bacteriocins isolated from fish and gut microbiota and presence of beneficiary bacteria in the fish gut. Further, this study highlighted where further research is a prerequisite to increase our basic understanding and search for novel bacteriocins to elucidate the proteins/peptides having antimicrobial properties for disease control in aquaculture as an alternative to antibiotics.  相似文献   

17.
Abstract  Substantial alterations to the legal controls over fish movements have been necessary to implement the Single European Market which came into force on 1 January 1993. This seeks to liberalize trade in fish and fish products whilst avoiding ecological damage, the spread of disease and the commercial damage this may cause. The new regime governing fish movements into and within the European Union under Directive 91/67/EEC, as implemented in England and Wales, is described. Remaining national provisions based on ecological concerns (principally, section 30 of the Salmon and Freshwater Fisheries Act 1975) are examined. Derogations from the principle of freedom of trade within the European Union on environmental protection grounds are assessed, and the interaction between legal restrictions based on pathological and ecological grounds is discussed.  相似文献   

18.
The effect of single and double freezing at ?20°C on fresh and aged red hake with two different holding times of the thawed fillets between the first and second freezing treatments was determined. In addition, twice-frozen fresh red hake was treated with two antioxidation systems to assess their effectiveness in reducing lipid oxidation. Fresh, untreated red hake at 0 time was used for comparison. Significant dimethylamine (DMA) production occurred with all frozen samples, and the differences were not marked after 7-month storage. With a storage time of 3 months, however, there were differences between the treatments in both the fresh and aged samples with the once-frozen sample producing the least DMA, the twice-frozen sample with the 24-h holding time between freezings the most, and the twice-frozen sample with a 6-h holding time between freezings giving intermediate values. All samples showed a greater than 50% loss in protein solubility as determined by lithium chloride extraction after 3 months of storage, and the protein solubility declined further when samples were tested at 7 months. Samples with the best (once-frozen fresh) and worst (twice-frozen with 24-h holding time between freezings of 5-day aged muscle) treatments had the highest thiobarbituric acid-reactive substances (TBARS) values. Both antioxidant treatments were effective in reducing TBARS development.  相似文献   

19.
Hydropower‐related damage to fish remains a great challenge, making objective monitoring of turbine‐related fish injury a necessity. The catch of fish at turbine outlets is currently realised by net fishing, but potential catch‐related injuries are largely unknown. Catch efficiency and fish‐friendliness in relation to fish handling, exposure time, floating debris and fish biomass of four fish recovery installations were assessed using seven species. Highly species‐specific lethal and sublethal effects were observed. Exposure time had the strongest effects on catch‐related damage, being up to 150‐fold increase after 12 hr compared to 1 hr. Up to 84% mortality occurred in the most sensitive species Thymallus thymallus L. Besides exposure time, higher current speed and biomass within the net resulted in greater fish damage. To minimise catch‐related effects, keeping emptying periods <1–2 hr and considering the effects of current speed, fish and debris biomass are crucial to increase data comparability among studies.  相似文献   

20.
Knowledge on the extent and mechanisms of fish damage caused by hydropower facilities is important for their ecological improvement. Herein, a novel field‐based fish injury assessment protocol is proposed that includes vitality and four general health criteria, as well as nine lethal and sub‐lethal injury types across 18 body parts. The protocol was validated using 3,087 specimens from four species of hatchery‐reared fish, as well as 2,262 specimens from 32 species of wild fish. The protocol allowed a detailed and systematic evaluation of different fish injury types in the field. Injuries related to handling and to contact with different parts of the hydropower structure could be distinguished applying multivariate statistics. This approach allows quantification and comparison of fish injuries across sites, and can help to identify the technologies and operational procedures that minimise damage to fish. It may also be useful to assess fish health in other contexts including aquaculture.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号