Fish,with the most abundant genus in vertebrates,is one of the most important indicators for stable aquatic ecosystem.With the global climate changes and over-exploitation,fishery resources have been suffered by heavy stresses,particularly in the estuary where human activitiy is frequent.Thus,how to better conserve and manage fish resources is a crucial issue for biologists.However,it is unrealistic to conserve and manage all species at the same time due to the limitation of manpower and material resources.So the endangered and rare species should be protected in priority.The Minjiang River is the largest river in Fujian province with a total length of 541km.With the complex terrain and drastic changes in salinity,the Minjiang River Estuary and adjacent waters is an important breeding,nursery and foraging ground for many estuarine fish species.Fishery resources in this region have been studied by some researchers,and the results have pionted out that the marine fishery resources have been seriously declining,but none of them refered to the protection priority of the fishes.Based on the survey data collected by bottom trawl in the Minjiang River Estuary and adjacent waters during 2006 and 2007,combined with the historical survey and documentary information,an evaluation index system of protection priority for fishes was established,which consisted of three sub-systems:the endangered species system,the genetic value system and the species value system.Meanwhile,the evaluation grade and standard of priority conservation order of different species was determined by expert consultation.In order to overcome the subjective random of weight determination,the information entropy principle was used to determine the objective weights of each index.Furthermore,the ideal point method was introduced to calculate the protection priority of different species.The results showed that Lepturacanthus savala,Dasyatis laevigatus and Scomberomorus niphonius were the species with the highest protection priority in this aquatic ecosystem,so the three species should be firstly considered while planning fish protection area and setting fishing off season,collecting catch statistical data and regulating fishing gear standards.The results provide significant references for the protection of fishes in this region.In the future research,it is necessary to further strengthen the protection of local endemic species and establish more improved evaluation index system and evaluation standards.%利用2006～2007年闽江口及附近海域拖网调查所获得的鱼类资料,结合历史调查和相关文献所收集到的资料,以理想点理论为基础,构建基于物种濒危系统、物种遗传价值系统和物种价值系统的评价体系,并确定评价等级和标准.同时在应用信息熵原理的基础上,引入理想点法建立评价模型并计算了评价指标值(相对贴进度Ti).研究结果表明:沙带鱼(Lepturacanthus savala)、光魟(Dasyatis laevigatus Chu)和蓝点马鲛(Scomberomorus niphonius)是闽江口及其附近海域应优先保护的3种鱼类,在设立鱼类保护区、设定保护期、收集渔获统计数据和制定捕捞网具标准等时应优先考虑这几种鱼类.研究结果对该海域的鱼类保护具有一定参考意义.在将来的研究中,需要进一步加强本地特有品种的保护研究,并建立更为完善的评价指标体系和评分标准.
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