Impact of a large-scale area closure on patterns of fishing disturbance and the consequences for benthic communities   总被引：3，自引：6，他引：3  

Dinmore  T.A; Duplisea  D.E; Rackham  B.D; Maxwell  D.L; Jennings  S 《ICES Journal of Marine Science》2003,60(2):371-380

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A multidisciplinary study of the immediate effects of mechanical clam harvesting in the Venice Lagoon     

Pranovi  F; Da Ponte  F; Raicevich  S; Giovanardi  O 《ICES Journal of Marine Science》2004,61(1):43-52

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舟山渔场及其邻近海域水团的气候学分析   总被引：23，自引：1，他引：23  

张启龙  王凡 《海洋与湖沼》2004,35(1):48-54

根据多年(1958—1990)月平均温、盐度资料，采用模糊聚类分析法划分了舟山渔场及其邻近海域的水团，并对该海域水团的配置、主要特性及其季节变异特征进行了气候学分析。结果表明，舟山渔场及其邻近海域共存在4个水团，即江浙沿岸水、台湾暖流表层水、台湾暖流深层水和黄海混合水；全年水团的配置可归纳为冬季型、夏季型和过渡型3种类型；江浙沿岸水的主要特征为低盐，其分布范围和盐度的季节变化与长江入海径流密切相关，而温度的季节变化则主要受太阳辐射的影响；台湾暖流表层水具有高温、次高盐特征，其北伸程度和温、盐特性均具有明显的季节变化，即冬季北伸强、温度低、盐度高，夏季北伸弱、温度高、盐度低；台湾暖流深层水以低温、高盐为主要特征，仅存在于4—9月，其温、盐性质较稳定；黄海混合水的主体不在研究海域。  相似文献   

模糊类比分析法在渔业数值预报中的应用研究     

苗振清  严世强 《中国海洋大学学报(自然科学版)》2003,33(4):540-546

渔业数值预报除涉及水文、气象、饵料生物量、资源幼体等的资源环境因子外 ,还要考虑经济、社会等因素。本文在分析 1987～ 1993年历史资料的基础上 ,利用资料之间的类比性 ,提出渔情预报的模糊类比分析方法 ,将预报年份与历史记录之间的多指标综合类比排序 ,得出预报值。在东海北部鲐渔情预报中发现 ,与直接估算法比较 ,该方法具有所需资料少、预报迅速合理的优点 ,而且随着历史资料的扩充 ,自身能够不断学习更新。  相似文献   

The collapse of cod in Eastern Canada: the evidence from tagging data   总被引：1，自引：0，他引：1  

Myers  R. A.; Barrowman  N. J.; Hoenig  J. M.; Qu  Z. 《ICES Journal of Marine Science》1996,53(3):629-640

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Impact of fish distribution and species composition on the relationship between acoustic and swept-area estimates of fish density     

Aglen  Asgeir 《ICES Journal of Marine Science》1996,53(2):501-505

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Commercial whaling,tourism, and boycotts: An economic perspective     

Guillermo E. Herrera  Porter Hoagland 《Marine Policy》2006

Commercial whaling is highly contentious, angering animal rights groups and conservation organizations, who threaten boycotts. Proponents of whaling argue that many whale stocks are plentiful enough to support sustainable harvests. In terms of economic efficiency, a nation's decision to engage in whaling depends on rents from the whaling industry, ecological and market linkages, and the potential for boycotts. We analyze the tradeoffs involved in a nation's decision to engage in whaling, whale-watching, and fishing. Scenarios exist in which whaling is economically rational. Indeed, sometimes it makes economic sense to subsidize whaling. In other circumstances, market pressures make commercial whaling inefficient.  相似文献   

A Quantitative Study of the Stony Coral Fishery in Cebu, Philippines   总被引：5，自引：0，他引：5  

Michael A.  Ross 《Marine Ecology》1984,5(1):75-91

Abstract. The Philippines is generally accepted to be the center of the international trade of stony corals for ornamental use. Despite existing legal bans on the collection and export of stony corals in the Philippines, the coral trade continues to date, particularly in Cebu. This paper reports on the specific market demand for stony corals in Cebu and the effects of commercial collection based on the results of a quantitative study of two shallow coral reef areas subjected to large differences in collection effort. Comparison of the measured coral community parameters suggests selective population changes and reduced abundance of exploited coral populations as a result of commercial collection. Estimates of the natural mortality, fishing mortality and yield are presented for the two sampled populations of Pocillopora verrucosa , utilizing the method of GRIGG (1976). Based on the study results and a review of reported coral growth rates and coral colony size at reproductive maturity, the potential for resource management of stony corals on a sustainable yield basis is - discussed.  相似文献   

Linking fishery management and conservation in a tropical estuarine lagoon: biological and physical effects of an artisanal fishing gear     

M. Rueda  O. Defeo 《Estuarine, Coastal and Shelf Science》2003,56(5-6):935-942

Information coming from fishery monitoring, surveys and experimental fishing with participation of fishers was employed to determine the impact of an artisanal gear, ‘boliche’, on the biodiversity of the Ciénaga Grande de Santa Marta (CGSM), an estuarine lagoon on the Caribbean coast of Colombia. Fishery monitoring (catch data) included landings before (1968 and 1978) and after (1994–1996) the introduction of the boliche in the CGSM (1985), whereas surveys were conducted seasonally during 1993–1994. Fishing experiments involved evaluating different mesh sizes and the short-term effect of physical disturbance by the boliche. Monitoring suggested potential trophic effects of this fishing gear: the catch of large, long-lived, carnivorous species declined after the introduction of the boliche in the CGSM, whereas catch rates of smaller, shorter-lived, and lower trophic level species increased. Surveys revealed that the boliche retained 41 species. The by-catch made up 62% of the total catch and the remaining 38% involved the three target species Eugerres plumieri, Mugil incilis and Cathorops spixii. Selectivity experiments showed that 2.5 in. stretched mesh size gill nets caught more species than the 3.0-in. mesh. The smaller mesh also increased the risk of a critical reduction in the spawning stock of target species (notably E. plumieri); a situation that could affect the fish community if mesh sizes lower than 2.5 in. were intensively used. Suspended particulate matter significantly increased after fishing activity, with higher resuspension on mud-shells and mud substrata, whereas dissolved oxygen showed no appreciable changes after fishing operations. Notwithstanding, the activity of the boliche would generate sediment resuspension between 382 and 470 t day⁻¹, which could lead to potential cascade impacts on water quality. We propose a framework of redundancy in management measures in order to simultaneously reach management and conservation goals.  相似文献   

闽东北外海渔场捕捞中上层鱼类的渔具,渔法研究     

王芳灿 《台湾海峡》1995,14(4):413-417

本文分析了闽东北外海渔场资源特点，并就不同类型的拖网、围网渔具的适渔性对比试验进行了研究，认为以主机功率330.75kw及以上的拖网渔船，使用四片式疏目拖网和以主机功率183．75kw及以上的围网渔船，使用250m×150m的无囊灯光围网，于春、夏汛时在该渔场100m等深线附近海域能较有效地捕捞鲐鲹等中上层鱼类。  相似文献