直接滴定法测定鱼油中酸价的研究   总被引：1，自引：0，他引：1  

翟毓秀  尚德荣 《海洋科学》1997,21(5):65-66

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厦门港及邻近海域的浮性鱼卵和仔,稚鱼   总被引：6，自引：4，他引：6  

蔡秉及  王志远 《台湾海峡》1994,13(2):204-208

本文报道厦门岛区和大嶝岛区海域浮性鱼卵和仔，稚鱼的种类组成与数量分布。其记录４４种鱼类，其中有８个主要种类，鱼卵和仔，稚鱼和总密度季节变化较大，均以冬，春季高，夏秋季低。  相似文献   

Climate change: A looming challenge for fisheries management in southern Africa     

Barry M. Clark 《Marine Policy》2006

It is now widely accepted that the earth's climate is changing under the influence of anthropogenic activities. A number of key changes in the earths atmosphere and ocean have already been detected (including increasing global surface temperature, rising sea levels, increases in incident UV radiation, changes in average annual precipitation, and increases in the variability and intensity of extreme weather events, among others), while speculation regarding future changes is rife. The implications of global climate change for fish stocks and fisheries is of concern to many scientists, but little effort has been made to incorporate observed changes or event such thinking into management models and paradigms. This paper summarises available evidence linking the production of key greenhouse gases with observed and future projected changes in the earth's climate, specifically in respect of a number of key atmospheric and oceanographic parameters likely to affect fish stocks in South Africa (temperature, pressure/wind fields, CO₂ concentration, rainfall, mean sea level and UV radiation). It also explores likely effects of these changes on fish stocks and key fishery sectors. In addition, it highlights a number of positive steps that be taken by management authorities to ensure that they and the fishing communities for which they are responsible are in the best possible position to deal with the effects of changing global climate as they become manifest.  相似文献   

Residues of C-4n-nonylphenol in mosquitofish (Gambusia holbrooki) oocytes and embryos during dietary exposure of mature females to this xenohormone     

Rmi Thibaut  Gilles Monod  Jean-Pierre Cravedi 《Marine environmental research》2002,54(3-5)

In order to assess in fish the maternal transfer of alkylphenolic compounds to the progeny, the identification and quantification of the labelled compounds present in oocytes and embryos was conducted after dietary exposure of mature female mosquitofish to ¹⁴C-4n-nonylphenol during vitellogenesis and embryogenesis respectively. Radioactivity found in bile and liver extracts accounted for 0.9–0.6 and 0.2–0.1% of ingested radioactivity for females exposed during vitellogenesis and embryogenesis respectively. The amount of extractable radioactivity present in oocytes and embryos was 0.19 and 0.07% of the ingested dose respectively. The radio-HPLC profiles obtained from bile, liver, oocyte and embryo extracts were similar. They showed the presence of 4n-NP-glucuronide as the major metabolite and traces of unchanged 4n-NP. The other metabolites corresponded to 8-hydroxynonylphenol, 9-(4-hydroxyphenyl)-nonanoic acid and para-hydroxybenzoic acid which is the final product of the alkyl chain oxidation. Our results indicate that exposure of ovoviviparous female fish to 4-NP during vitellogenesis and embryogenesis leads to the contamination of the progeny by 4-NP and its metabolites.  相似文献   

Molecular evidence for multiple UDP-glucuronosyltransferase gene familes in fish     

George SG  Taylor B 《Marine environmental research》2002,54(3-5):253-257

The presence of multiple distinct UGT genes in fish was derived by analysis of DNA sequence data derived the zebrafish EST project, confirming indications from previous protein purification studies in another fish species, the plaice, for a diversity of isoforms in lower vertebrates. At least 10 different UGTs can be identified from nucleotide sequence data in zebrafish. Phylogenetic analysis of exon 1 sequences of the zebrafish, plaice and human UGTs indicates that six of these genes are related to the 1A, 1B and 2 families and that a further four genes were of more ancient lineage. Importantly data for the 3' sequences of the zebrafish clones, both from the database and our own sequences of the publicly available clones did not provide any evidence for elaboration of family 1A genes by alternative splicing in this lower vertebrate.  相似文献   

Survival of young gadoids excluded from a shrimp trawl by a rigid deflecting grid     

Soldal  Aud Vold; Engas  Arill 《ICES Journal of Marine Science》1997,54(1):117-124

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温度和活动对仔鲱氧代谢的影响   总被引：7，自引：0，他引：7  

殷名称  R．S．Batty  C．E．Franklin  I.A.Johnston 《海洋与湖沼》1995,26(3):285-294

于１９９３年春在苏格兰采用微电量测氧仪测定大西洋鲱仔鱼在封闭式呼吸器内的耗氧量，并以其作代谢率，通过红外光源录象系统同步纪录仔鲱的游泳活动，从而首次实现仔全在不同温度条件下代谢与活动的相关。同时，还分别测定仔鲱在浅麻醉（静止）和黑暗状态下的耗氧量，仔鲱的实验和饲养温度一致，分为７．３，１１．０和１２．９℃３个组别。结果表明，仔鲱在常规，静止和黑暗条件下的耗氧量均与体重显著相关，且随温度而提高。仔鲱  相似文献   

An overview of the ecosystems of the Barents and Norwegian Seas and their response to climate variability     

Harald Loeng  Ken Drinkwater 《Deep Sea Research Part II: Topical Studies in Oceanography》2007,54(23-26):2478

The principal features of the marine ecosystems in the Barents and Norwegian Seas and some of their responses to climate variations are described. The physical oceanography is dominated by the influx of warm, high-salinity Atlantic Waters from the south and cold, low-salinity waters from the Arctic. Seasonal ice forms in the Barents Sea with maximum coverage typically in March–April. The total mean annual primary production rates are similar in the Barents and Norwegian Seas (80–90 g C m⁻²), although in the Barents, the production is higher in the Atlantic than in the ice covered Arctic Waters. The zooplankton is dominated by Calanus species, C. finmarchicus in the Atlantic Waters of the Norwegian and Barents Seas, and C. glacialis in the Arctic Waters of the Barents Sea. The fish species in the Norwegian Sea are mostly pelagics such as herring (Clupea harengus) and blue whiting (Micromesistius poutassou), while in the Barents Sea there are both pelagics (capelin (Mallotus villosus Müller), herring, and polar cod (Boreogadus saida Lepechin)) and demersals (cod (Gadus morhua L.) and haddock (Melanogrammus aeglefinus)). The latter two species spawn in the Norwegian Sea along the slope edge (haddock) or along the coast (cod) and drift into the Barents Sea. Marine mammals and seabirds, although comprising only a relatively small percentage of the biomass and production in the region, play an important role as consumers of zooplankton and small fish. While top-down control by predators certainly is significant within the two regions, there is also ample evidence of bottom-up control. Climate variability influences the distribution of several fish species, such as cod, herring and blue whiting, with northward shifts during extended warm periods and southward movements during cool periods. Climate-driven increases in primary and secondary production also lead to increased fish production through higher abundance and improved growth rates.  相似文献   

Fish Assemblages of Posidonia oceanica Beds at Port-Cros (France, NW Mediterranean): Assessment of Composition and Long-Term Fluctuations by Visual Census     

P. Francour 《Marine Ecology》1997,18(2):157-173

Abstract. Observations of the fish fauna of Posidonia oceanica (L.) DELILE seagrass beds were undertaken in two shallow stations and one deeper station in Port-Cros National Park, between November 1984 and September 1987. Demographic structure, density and biomass of the 19 most abundant species or taxa were assessed by several non-destructive sampling methods. The fish assemblages studied were dominated in number and biomass by a small number of species (Labridae: Symphodus ocellatus and S. tinca ; Sparidae: Diplodus annularis and Sarpa salpa ). Large individuals were infrequent and small size class fish were dominant especially in sheltered shallow areas. Recruitment and migrations (shortor long-term) have been identified as the most important causes of abundance variations over the year. The four trophic categories were sampled only in the sheltered shallow zone, where the herbivore Sarpa salpa represents a strong proportion of the fish fauna (40–70%) during summer. The fish assemblages differ between the three seagrass beds, and the depth appears as the most important factor affecting the fish assemblages in P. oceanica . The functional difference between shallow and deeper seagrass beds is therefore discussed.  相似文献   

Status of young-of-the-year brown trout (<Emphasis Type="Italic">Salmo trutta fario</Emphasis>) in Swiss streams: factors influencing YOY trout recruitment     

Eva Schager  Armin Peter  Patricia Burkhardt-Holm 《Aquatic Sciences - Research Across Boundaries》2007,69(1):41-50

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