Fishing industry and related perspectives on the issues raised by no-take marine protected area proposals   总被引：2，自引：2，他引：0  

P.J.S. Jones   《Marine Policy》2008,32(4):749-758

In the face of growing calls for no-take marine protected areas (NTMPAs), the views of fishing industry representatives in south-west (SW) England on related issues are analysed. Only 23% thought NTMPAs were the way forward and a range of concerns were expressed, e.g. that the ‘terrestrial’ protected areas approach and related biodiversity conservation objectives will be extended to the seas, and that fish yield reductions from the loss of access to NTMPAs are very unlikely to be compensated for through spillover/export. Some interesting approaches to ameliorating these concerns emerged, such as being open and honest that NTMPAs are primarily intended to achieve biodiversity conservation benefits, reducing uncertainty concerning the potential for any secondary fisheries spillover/export benefits, justifying NTMPAs on an objective, rational basis rather than on a subjective, precautionary basis, and the quid pro quo streamlining of wider fisheries management approaches. This research reveals a more diverse range of perspectives amongst fishing industry representatives on the issues raised by NTMPA proposals than is often assumed.  相似文献   

Deciphering potential groundwater zone in hard rock through the application of GIS   总被引：6，自引：1，他引：5  

R. K. Prasad  N. C. Mondal  Pallavi Banerjee  M. V. Nandakumar  V. S. Singh 《Environmental Geology》2008,55(3):467-475

Remote Sensing and Geographic Information System has become one of the leading tools in the field of hydrogeological science, which helps in assessing, monitoring and conserving groundwater resources. It allows manipulation and analysis of individual layer of spatial data. It is used for analysing and modelling the interrelationship between the layers. This paper mainly deals with the integrated approach of Remote Sensing and geographical information system (GIS) to delineate groundwater potential zones in hard rock terrain. The remotely sensed data at the scale of 1:50,000 and topographical information from available maps, have been used for the preparation of ground water prospective map by integrating geology, geomorphology, slope, drainage-density and lineaments map of the study area. Further, the data on yield of aquifer, as observed from existing bore wells in the area, has been used to validate the groundwater potential map. The final result depicts the favourable prospective zones in the study area and can be helpful in better planning and management of groundwater resources especially in hard rock terrains.  相似文献   

JD直连式深孔绳索取心钻杆的研制与应用          下载免费PDF全文

许华松  覃强华  熊海书 《探矿工程》2008,35(10):33-35

根据深部找矿的需要,立足于我国目前钻探设备现状和材料冶炼及机械加工水平,通过对钻杆选材、结构、制造工艺的创新,研制了一种两端镦粗后整体热处理再车螺纹的新型深孔绳索取心钻杆及配套钻具,经使用,效果达到了设计要求。  相似文献   

闽南-台湾浅滩渔场浮游软体动物的分布     

黄加祺  朱长寿  李少菁 《台湾海峡》1993,(2)

本文分析了1987年12月至1988年11月在闽南-台湾浅滩渔场6个航次采集的浮游软体动物,初步鉴定44种,以马蹄(?)螺、棒笔帽螺、尖笔帽螺和蝴蝶螺为该海区的优势种。本文研究了它们的季节变化,平面分布和垂直分布,并讨论了它们与上升流及其他水系的关系。  相似文献   

光诱鱿鱼浮拖网渔具渔法试验报告     

郑国富??  郑雅友??  戴天元??  洪明苇??  黄桂芳 《海洋科学》2001,25(4):5-8

1989－1999年开展光诱鱿鱼浮拖网渔具渔法研究的生产试验结果为：1998年生产试验86个夜（航次），总产量33．225t，其中鱿鱼产量为12．470t，占总产量的37．5％，总产值139000元，比同村光诱敷网的平均产量（31．62t）高5．1％左右。1999年生产试验80夜（航次），总产量54．66t，其中鱿鱼产量31．92t，占总产量的58．4％，总产值187000元。试验网产量比同村光诱敷网的平均产量（45．64t)增产19．76％，产值增加22．65％，鱿鱼产量占总渔获量的比例提高近10个百分点，投入产出比为1：1．684。取得了较好的试验结果，达到了预期试验目的。此外，文中还讨论了水上灯数量，网具规格和柔性网板等对生产效果和捕捞对象的影响及适应性情况，并建议开展光场强度及其分布的海上实测和光场强度对鱿鱼，趋光性鱼类的行为习性以及生长影响等试验研究，制定出光诱鱿鱼浮报网和敷网作业诱鱼灯数量和分布标准，以合理利用鱿鱼和中上层鱼类资源，实现可持续发展。  相似文献   

Effects of suction-dredging for cockles on non-target fauna in the Wadden Sea     

J. G. Hiddink   《Journal of Sea Research》2003,50(4):315-323

Suction dredging for cockles removes large cockles from tidal flats and may also cause mortality of non-target fauna and make the habitat less suitable for some species. This study examines whether suction dredging for cockles on tidal flats of the Dutch Wadden Sea had affected densities of non-target fauna, directly after fishing and one year later. Densities of non-target fauna in two randomly chosen undredged locations were compared to densities at the surrounding heavily commercially dredged area. A significant negative effect of cockle dredging on densities of 0-group Macoma balthica was observed and this effect persisted one year after dredging. The dredged area appeared to be less suitable for settlement of mussels Mytilus edulis. No significant effects of dredging on the mudsnail Hydrobia ulvae and on 0 and 1-group C. edule were found. For the mobile young Macoma balthica it seems unlikely that the effect found after one year was still due to the mortality caused by dredging and this suggests that the habitat was less suitable as a consequence of dredging. Thus, even in the highly dynamic ecosystem of the Wadden Sea, effects of bottom disturbance by cockle dredging may persist after one year.  相似文献   

Reducing fishing vessel fuel consumption and NO_X emissions     

Robert Latorre   《Ocean Engineering》2001,28(6)

There is a growing concern with the impact of marine operations on the environment. This requires reducing fuel consumption and vessel pollution during operation. On-board computers and satellite communications will enable the operator to reduce fuel consumption and NO_X emissions during vessel operations.This paper presents the results of a study on this problem and how such an on-board system could be implemented to reduce fuel consumption and engine NO_X emissions.  相似文献   

Numerical simulation of the hydrodynamic behaviour of submerged plane nets in current     

Yu-Cheng Li  Yun-Peng Zhao  Fu-Kun Gui  Bin Teng 《Ocean Engineering》2006,33(17-18):2352-2368

The aim of this paper is to investigate the shape and tension distribution of fishing nets in current. A numerical model is developed, based on lumped mass method to simplify the net. The motion equation is set up for each lumped mass. The Runge–Kutta–Verner fifth-order and sixth-order method is used to solve these simultaneous equations, and then the displacement and tension of each lumped mass are obtained. In order to verify the validity of the numerical method, model tests have been carried out. The results by the numerical simulation agree well with the experimental data.  相似文献   

浙江渔场的渔业资源动态与监测          下载免费PDF全文

宋海棠  丁天明 《海洋开发与管理》1994,11(3):27-31

本文根据历史资料和１９９３年资源动态监资料，阐明了浙江渔场及邻近海域渔业资源的变化状况，重点叙述了鲐、Ｃｈａｎ鱼、虾类、头足类的资源开发利用动态，讨论了渔业资源动态监测工作，提出今后搞好资源监测工作的建议。  相似文献   

东白令海的刺黄盖鲽渔场海洋学与渔业生物学特征     

宋云升  陈大刚 《海洋科学》1989,13(1):45-48

本文概述了东白令海形成刺黄盖鲽渔场的海洋学特征,并结合现场调查的标样侧重分析了刺黄盖鲽的渔业生物学特征,本文还概略地讨论了该鱼与渔业资源的关系。  相似文献