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The life history of Tenualosa macrura in Sarawak, further notes on protandry in the genus and management strategies 总被引：1，自引：0，他引：1
S. J. M. BLABER G. FRY D.A. MILTON T. VAN DER VELDE O. BOON-TECK J. PANG & P. WONG 《Fisheries Management and Ecology》2005,12(3):201-210
Abstract The contraction of Tenualosa macrura (Bleeker) to the Sarawak coast and a small part of Sumatra, and the decline in its fishery mirror what has happened to three other species in the genus. Little was known of this species in its last stronghold in Sarawak where it is important for management and conservation reasons to understand its biology and life history. It forms part of a multispecies fishery where effort is uniform, but catches follow a lunar cycle. Tenualosa macrura is protandrous, but low numbers of small females suggest diandry. In Sumatra Tenualosa macrura spawn throughout the year, but in Sarawak have a seasonal peak in the NE monsoon (December). This has management implications because the Sarawak fishery ceases at this time because of adverse weather, hence reducing fishing pressure on spawning T. macrura . Management measures introduced in Sarawak for Tenualosa toli (Valenciennes) may therefore not be required for T. macrura . 相似文献
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Long‐term records (1781–2013) of European eel (Anguilla anguilla L.) production in the Comacchio Lagoon (Italy): evaluation of local and global factors as causes of the population collapse 
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下载免费PDF全文 Vassilis Aschonitis Giuseppe Castaldelli Mattia Lanzoni Remigio Rossi Clive Kennedy Elisa Anna Fano 《水产资源保护:海洋与淡水生态系统》2017,27(2):502-520
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中国渔业资源衰退问题的多因性与组合解 总被引：1，自引：1，他引：0
针对20世纪90年代出现的生物学和经济学意义上的双重捕捞过度,运用故障树分析法分析可知,渔业资源衰退问题的形成具有多因性。因此,单一和孤立的既有防范措施,只能是"症状解"而非"根本解"。在兼顾全面性和重点性的基础上给出了中国渔业资源衰退问题的组合解,以期寻求中国渔业经济可持续发展的可靠路径。 相似文献
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Contemporary and emerging fisheries in The Bahamas—Conservation and management challenges,achievements and future directions 下载免费PDF全文
下载免费PDF全文 Krista D. Sherman Aaron D. Shultz Craig P. Dahlgren Claire Thomas Edward Brooks Annabelle Brooks Daniel R. Brumbaugh Lester Gittens Karen J. Murchie 《Fisheries Management and Ecology》2018,25(5):319-331
The harvest of marine resources has long‐standing cultural and economic importance to The Bahamas and other small island developing states. Tourists and residents place a demand on local marine resources, particularly Caribbean spiny lobster, Panulirus argus (Latreille), queen conch, Lobatus gigas (Linnaeus) and Nassau grouper, Epinephelus striatus (Bloch), and many fishery products are also sold on the global market. Illegal, unreported and unregulated fishing coupled with inadequate regulations and enforcement are the main factors contributing to the decline of Bahamian fisheries along with other anthropogenic impacts. This article reviews the status of fisheries management in The Bahamas using economically and ecologically important species as case studies to highlight conservation successes, knowledge gaps and deficiencies in existing management approaches. The review concludes with an examination of how emerging fisheries and improved conservation management strategies have the potential to improve economic and food security throughout the archipelago. 相似文献
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Leonardo Manir Feitosa Lucas Pereira Martins Leandro Augusto de Souza Junior Rosangela Paula Lessa 《水产资源保护:海洋与淡水生态系统》2020,30(5):882-891
- Updated distribution ranges are crucial for conservation status assessments. Comprehensive analyses combining published literature and available data on historical catches and species distribution models (SDMs) are effective tools that could improve the prediction of more realistic scenarios for some species, especially those with limited information available and facing multiple threats.
- The present study aimed at generating an updated distribution for the smalltail shark Carcharhinus porosus, one of the most threatened and understudied shark species of the western Atlantic Ocean. Estimates of the key areas for this species conservation based on the SDMs, and trends in catch probabilities throughout its distribution range are provided.
- Four algorithms (BIOCLIM, Domain, Mahalanobis, and Maximum Entropy) were used to model the distribution of C. porosus and calculate its habitat suitability based on marine environmental variables. To assess historical catch probability trends, we built a generalized linear model from published and grey literature data. This analysis was used to estimate catch probability as an indication of population trends.
- SDMs suggest that the northern coast of South America (NCSA) harbours the most suitable habitats for C. porosus in the world, which was expected given its historically high catch rate in this region. In addition, there was a continuously declining catch probability trend starting in the 1970s. However, the decline was smaller for the NCSA as compared with the Gulf of Mexico and the eastern South America coast.
- Results indicate that the NCSA should be considered the currently most important area in the world for this species conservation. Furthermore, the lack of data throughout Central and South American marine regions hampers the evaluation of extinction risk throughout its updated distribution. Thus, research in these areas is urgently required for a more comprehensive conservation status assessment.
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本文应用2007年黑龙江省136个产业部门的投入产出表对黑龙江省畜牧业进行产业波及效应分析，并将其研究结果与2002年的畜牧业产业波及效应加以比较，认为黑龙江省畜牧业的产业波及效应无论是在程度上还是在范围上都有着明显的增强和扩大，具体表现在畜牧业的影响力和感应度双双超过国民经济部门的平均水平，从而使其成为对黑龙江省经济发展具有强大推动作用的优势农业产业。最后提出黑龙江省必须继续巩固畜牧业在促进黑龙江省经济发展中的战略地位，优化畜牧业产业内部结构和布局结构，完善畜牧业产业化经营体系。 相似文献
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Anders Koed Kim Birnie‐Gauvin Finn Sivebk Kim Aarestrup 《Fisheries Management and Ecology》2020,27(1):64-76
The status of Atlantic salmon, Salmo salar L., over the last decades has been of concern across its entire distribution area. Its anadromous nature exposes the species to human pressures in both freshwater and marine environments, and over long periods, thus exacerbating its decline. Given its value within the food industry, the recreational angling community as well as culturally, the status of Atlantic salmon is regarded as a matter of national and international conservation interest, providing great incentive for its management. The literature currently lacks specific examples of successful and unsuccessful management strategies and practices for Atlantic salmon populations at a broader scale. To address this, the present article describes how the multi‐faceted management approach taken for Danish Atlantic salmon, which included changes in legislation, stocking practices, habitat restoration, population genetics and barrier removals, successfully rehabilitated salmon populations in four major Danish rivers. Specific recommendations are provided for the successful management of Atlantic salmon elsewhere. 相似文献
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1. The distribution and abundance of reefs of Serpula vermicularis was examined in Loch Creran, the only known remaining site of reefs of this species in Scotland. In view of the decline in populations elsewhere, the aims included assessment of the importance of the Scottish population in terms of conservation of the reef habitat and the establishment of a baseline against which future changes could be gauged. A further objective was to determine appropriate conservation management of the reefs by examining the influence of both natural and anthropogenic factors. 2. Reefs were largely restricted to a depth range of 1–13 m. Factors controlling the depth distribution are discussed. 3. Serpula vermicularis reefs colonized a variety of substrata, but predominantly grew on lamellibranch shells on a seabed of muddy sand. There was some evidence that reef abundance was influenced by the availability of suitable substrata. 4. A belt of scattered reefs fringed much of the coastline of the loch with profuse reef development at two sites, where reef coverage exceeded 10% of the seabed. In terms of total abundance of Serpula vermicularis reefs, Loch Creran represents the major world site for reef development. It is concluded that the reefs of Loch Creran are of significant nature conservation importance and grounds for the establishment of conservation management are discussed. 5. Reef development is apparently curtailed in areas of strong currents and high flushing rate. There is evidence that human activity has adversely influenced reef growth through the discharge of organic factory effluent and the physical disturbance caused by mooring ground tackle. Scallop dredging also represents a significant threat to the persistence of serpulid reefs. Methods of minimising damage to this rare and fragile feature are discussed. © 1998 John Wiley & Sons, Ltd. 相似文献
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- 1. The use of surrogate species (i.e. keystones, indicators, umbrellas) has been advocated for the conservation of target taxa and communities.
- 2. A recent Habitat Conservation Plan, which provided conservation measures intended to protect multiple aquatic species of concern over a large area, established an important precedent for surrogate species in aquatic conservation pursuant to the US Endangered Species Act.
- 3. The Habitat Conservation Plan's application of federally threatened bull trout was evaluated as an umbrella species for westslope cutthroat trout, which is in decline but not listed under the Act. Approximately 75% of known westslope cutthroat trout strongholds are not captured within bull trout strongholds west of the continental divide. The Habitat Conservation Plan failed to evaluate the suitability of this umbrella species and consequently failed to cover important priority areas for westslope cutthroat trout conservation.
- 4. This case study highlights the feasibility and importance of formally validating assumptions of surrogate species utility in multi‐species conservation planning.