Managing mobile species with MPAs: the effects of mobility, larval dispersal, and fishing mortality on closure size   总被引：1，自引：0，他引：1  

Le Quesne  W. J. F.; Codling  Edward A. 《ICES Journal of Marine Science》2009,66(1):122-131

  相似文献   

A context for ecosystem-based fishery management: Developing concepts of ecosystems and sustainability     

Sarah K. Gaichas 《Marine Policy》2008

Ecosystems have been viewed both as chaotic, untamed nature, and as mechanical systems with predictable equilibrium states. A developing concept of ecosystems as “complex adaptive systems” lies between these extreme concepts, with recognizably patterned but not fully predictable behavior. Sustainability has also been redefined as humans have exploited and often depleted desirable natural resources. Fisheries management desires sustainable yield, but must rethink this concept within the ecosystem context. The most powerful union of “ecosystem” and “sustainability” acknowledges the defining characteristics of complex adaptive systems with the objective of identifying and sustaining healthy relationships within and between ecosystems, economies, and society.  相似文献   

Changes in the mullet fishery of Lake Manzala,Egypt     

Magdy T. Khalil 《International Journal of Salt Lake Research》1996,5(3):241-251

Growth rates of the main mullet species (Liza ramada andMugil cephalus) in Lake Manzala are low compared to those in other Egyptian lakes. But average growth rates during the period 1989–1993 were relatively faster than in the 1960's. Spawning and migration seasons have been determined for every species, and their distribution in the lake, in terms of certain ecological parameters (salinity, turbidity and dissolved oxygen) have been investigated. Changes in the mullet fishery in the lake during the past 70 years have been studied. Due to an increase in nutrient loading and a decrease in salinity, mullet declined from 65 per cent of the total catch during the 1920's to only 2.2 per cent during the early 1980's. As a result of fisheries management and development programmes from 1989 to 1993, mullet production increased to 9.2 per cent of the total catch.  相似文献   

Book Reviews     

《Singapore journal of tropical geography》2002,23(2):236-243

Books reviewed:
Maruja M.B. Asis, (ed.) The Philippines as Home: Settlers and Sojourners in the Country.
Hans Gooszen, A Demographic History of the Indonesian Archipelago, 1880–1942.
Karin Bras, Image-Building and Guiding on Lombok: The Social Construction of a Tourist Destination.
K.S. Chon, (ed.) Tourism in Southeast Asia: A New Direction.  相似文献   

我国海洋农牧化发展研究     

陈君  张忍顺 《地理与地理信息科学》2000,16(1):22-26

该文对我国海洋渔业资源与开发现状进行评价,并在我国社会经济发展及技术条件允许的基础上,提出将传统的猎捕型渔业生产方式转变为管理型,以及进行海洋农牧化建设  相似文献   

Exploitation of small tunas by a purse-seine fishery with fish aggregating devices and their feeding ecology in an eastern tropical Atlantic ecosystem   总被引：2，自引：0，他引：2  

Menard  F.; Fonteneau  A.; Gaertner  D.; Nordstrom  V.; Stequert  B.; Marchal  E. 《ICES Journal of Marine Science》2000,57(3):525-530

  相似文献   

A multimetric-index approach using fisheries data to assess fish assemblage structure in relation to salinity gradient in a tropical West African estuary     

J Kantoussan  JM Ecoutin  R Laë  OT Thiaw  L Tito de Morais 《African Journal of Marine Science》2018,40(2):175-185

This study examines the effects of increasing salinity on fish assemblage structure in the Casamance Estuary, Senegal, using a series of indices. The study data were derived from commercial fishery surveys conducted between April and July 2005. Analysis of within-trophic-group diversity in the Casamance Estuary shows a significant drop in the diversity of apex predators in the upper, more saline reaches of the estuary. By contrast, primary consumers adapted well to salinity changes and exhibited higher taxonomic diversity in the upper reaches of the estuary than in the lower reaches. The findings also indicate decreases in average sizes of the landed species and the trophic levels among fish catches in the direction of the upper reaches. However, the catch per unit effort (CPUE) was globally higher in the upstream area of the estuary as compared with the downstream area. This increasing CPUE trend from the lower towards the upper reaches is attributed to (i) the high primary productivity in the upper Casamance Estuary; (ii) the increasing abundance of euryhaline fish species in an upstream direction; and (iii) ‘telescoping’ of the food chain through the presence of mostly herbivorous fishes in the upper reaches. Such a situation likely facilitated high fish production in the upstream area of the estuary, though multimetric indices indicated unfavourable living conditions for many fish taxa in this area.  相似文献   

山东省海洋水产原、良种产业的发展和对策          下载免费PDF全文

田敬云  张守都  姜勇  赵喜喜  郑冰  刘学庆  胡建廷 《海洋开发与管理》2018,35(12):42-46

为进一步提高山东省海洋水产种业的发展水平，促进海水养殖业和渔业经济的可持续发展，文章总结山东省海洋水产原、良种产业的发展特点，分析存在的问题，并提出对策建议。研究结果表明：山东省海洋水产原、良种产业具有起步较晚但发展速度较快，品种多、覆盖面广，代际连续性较强以及原、良种场建设全国领先的特点；目前仍然存在海洋水产良种的市场化程度较低、水产企业良种研发能力较弱以及国家级原、良种场的作用未有效发挥的问题；今后应重点推动育种技术进步，推进育、繁、推一体化发展模式，树立品牌意识，建立良种独立技术体系，加大对水产企业的支持力度，加强种质资源保护以及建立市场准入制度。  相似文献   

自然死亡率变化对黄海蓝点马鲛渔业管理的影响     

陈宁  张崇良  孙铭  徐宾铎  薛莹  任一平  陈勇 《海洋学报(英文版)》2018,37(8):21-30

传统的渔业资源评估方法对数据有一定的要求，而现有的许多渔业缺乏相关数据，造成了渔业评估和管理上的障碍。特别是自然死亡率，由于观测和计算的困难，研究中一般通过经验公式等方法进行假话，而不同来源的数据和估算方法的结果存在较大差异，可能导致在渔业资源评估和管理中很大的不确定性。本研究以蓝点马鲛（Scomberomorus niphonius）为例，利用MSE比较了22种基于有限数据的渔业管理规程（MP），筛选出DCAC、SPMSY、curE75、minlenLopt1 4种对于M不确定性较为稳健的的管理方法，并针对不同年代的自然死亡率以及通过不同计算方法得出的自然死亡率对这4种MP进行了管理策略评价。结果表明：M自1980s至今的不同年代间有显著降低趋势，该变化对MP管理效果产生了较强影响。随着M降低，种群B>0.5BMSY的概率显著上升，而过度捕捞可能性在不同MP间有方向性的差异。M变化对对curE75、minlenLopt1的长期产量的影响较小，而对DCAC、SPMSY的AAVY<15%的可能性变化较大，即降低产量的波动。不同M估算方法的估计值相差不大，对MP管理影响不明显。综合结果来看，Cur75受自然死亡率不确定性影响较小，对于渔业资源的开发和保护两个方面有着最好的权衡，最适用于我国蓝点马鲛渔业的管理。  相似文献   

基于贴现率的西北太平洋柔鱼生物经济模型及管理策略分析   总被引：1，自引：0，他引：1  

刘金立  陈新军  李纲 《中国海洋大学学报(自然科学版)》2014,44(4):42-46

西北太平洋柔鱼是我国远洋渔业重要的捕捞对象,综合考虑生物、经济和社会效益来科学制定渔业管理目标是确保柔鱼资源可持续利用的重要研究内容。本文根据1996—2011年我国鱿钓船在西北太平洋海域捕捞的柔鱼渔获量和作业成本,结合贴现率和渔获物价格等经济数据,构建基于贴现率的西北太平洋柔鱼生物经济模型。结果表明,西北太平洋柔鱼资源状况处于良好状态,并未遭受过度捕捞;当贴现率α在0.3~0.5之间,当前利益占长远利益的20%~30%(D=0.2~0.3),且渔获物价格在9 195~12 500元/t之间时,该海域的柔鱼资源种群资源量相对稳定,能达到最优种群数量水平,可保证柔鱼渔获量始终处在MSY之下,确保柔鱼资源的可持续利用。  相似文献