The distribution, density and growth of the European eel, Anguilla anguilla, in the freshwater catchment of the River Thames
The distribution, density and growth of the European eel, Anguilla anguilla, in the freshwater catchment of the River Thames
复制标题
泰晤士河淡水流域欧洲鳗鲡的分布、密度和生长
DOI：
10.1111/j.1095-8649.1993.tb00323.x
复制
发表时间：
1993
影响因子：
2
通讯作者：
B. Knights
中科院分区：
文献类型：
--
作者：
I. Naismith;B. Knights
自20世纪60年代以来，泰晤士河口水质的改善消除了鱼类迁移到泰晤士河流域的障碍。的范围内的鳗鱼的damenization检查，使用数据从235电捕鱼和fyke网的网站，与污染前的分布信息相比。密度最高的是在较低的部分集水区和显着减少，从潮汐限制的距离增加。只有稀疏的人口被发现超过50公里的潮汐限制，其特点是越来越偏向于更大，生长缓慢的女性。在某些地区，人工放养被认为是一个重要因素。海水化的速度一直很慢，19世纪污染前的海水存量的年度自然补充和分布似乎都没有实现。考虑到其商业、科学和保护价值，对该种群的未来管理。
Improvements in water quality in the Thames Estuary since the 1960s have removed a barrier to fish migration into the Thames catchment. The extent of recolonization by the eel is examined, using data from 235 electrofished and fyke-netted sites, compared with information on pre-pollution distribution. Density is highest in the lower parts of the catchment and decreases significantly with increasing distance from the tidal limit. Only sparse populations are found beyond 50 km from the tidal limit and are characterized by an increasing bias towards larger, slower-growing females. Artificial stocking is believed to be a significant factor in certain areas. The rate of recolonization has been slow and neither the annual natural recruitment nor distribution of the pre-pollution stock of the 1800s appears to have been achieved. The future management of the stock in relation to its commercial scientific and conservation value is considered.