基于水声学方法的东洞庭湖鱼类空间分布和资源量评估

发布时间：2018-02-03 12:57

本文关键词： 水声学东洞庭湖鱼类大小组成空间分布资源量　出处：《淡水渔业》2016年03期 　论文类型：期刊论文

【摘要】：2015年7月11—17日期间,通过使用回声探测仪(Simrad公司EY60型,200 k Hz换能器)对东洞庭湖的鱼类资源进行了探测评估。结果表明,调查航段的鱼类平均目标强度(目标鱼类对声波的反射能力)为(-51.24±5.66)d B,平均体长约为12 cm,体长范围为2~125.8 cm,不同区域间的鱼类目标强度(即鱼类大小)差异性显著。所有调查航段中鱼类密度1.223~1 534.2 f/1 000 m3之间,均密度为186.3 f/1 000 m3,不同区域间鱼类密度差异性显著,中部湖区(CEC航段)鱼类密度较高。应用资源密度体积法估算东洞庭湖鱼类资源量约为2.36×108f,其中目标强度在-43 d B(体长约28 cm)以下的鱼类占95.5%。
[Abstract]:During the period from 11 to 17 July 2015, the EY60 model was obtained through the use of an echo detector. The fish resources in Dongting Lake were evaluated by 200kHz transducer. The average target intensity (the target fish's ability to reflect sound waves) was -51.24 卤5.66 dB, and the average body length was about 12 cm. The body length was 125.8 cm. There were significant differences in fish target intensity (i.e. fish size) among different regions. The fish density in all the survey sections ranged from 1.2231.534.2 f- / 1 000 m ~ 3. The average density of fish was 186.3 f / 1 000 m ~ (3), and there was significant difference in fish density among different regions. The fish density of CEC section in the central lake region is relatively high, and the fish resources in East Dongting Lake are estimated to be about 2.36 脳 10 ~ 8f by using the method of resource density volume. Among them, the target intensity was less than -43 dB (about 28 cm in body length), and 95. 5% of the fish had a target intensity of-43 dB (about 28 cm).
【作者单位】：农业部长江中上游渔业资源环境科学观测实验站中国水产科学研究院长江水产研究所;华中农业大学水产学院;
【基金】：荆江航道整治工程的透水框架作为人工鱼礁效果的研究国家自然科学基金“长江中游四大家鱼产卵场定位及特征研究”(51579247) 农业部项目长江中上游重要渔业水域主要经济物种产卵场及洄游通道调查
【分类号】：S932.4
【正文快照】： 洞庭湖是中国第二大淡水湖泊,地处长江中游荆江南岸,南纳湘、资、沅、澧四水,北通长江,是我国长江中下游平原与长江干流直接连通的吞吐型湖泊,蕴含丰富的水资源和渔业资源,同时还是多种鱼类的索饵场、越冬场和产卵场[1-2]。廖伏初等[3]于2000—2006年调查研究表明,这7年间在洞

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