Freshwater fish surveys - salmonid age data (NFPD)

The Environment Agency undertakes fisheries monitoring work on rivers, lakes and transitional and coastal waters (TraC).

This dataset includes site and survey information, together with a detailed breakdown of the salmonid age data into numbers of 0+, >0+, 1+, >1+ age bands (where available), for freshwater fish surveys carried out across England from 1975 onwards.

Notes:
- These survey data are stored in an archive more commonly known as the NFPD (National Fish Populations Database).
- This dataset contains Freshwater fish surveys only.
- Third party data held on the NFPD are excluded from the dataset.
- Some historic surveys (particularly in Anglian Central) have incorrect survey lengths and survey widths. These can be identified by a survey length of 1 and a survey width that is equal to the area. The survey areas are correct. This is due to the migration of old historic data from previous databases into the NFPD.
- Approved for Access under AfA347.
- The dataset 'Freshwater fish surveys (NFPD)' may also be relevant, it contains fish lengths, weights, and the raw age data (where available).

Please see the Dataset Documentation for further detail. Attribution statement: © Environment Agency copyright and/or database right 2017. All rights reserved.

环境署负责对河流、湖泊以及过渡性及沿海水域（TraC）的渔业监测工作。本数据集包含了站点及调查信息，并详细分解了鲑形鱼类年龄数据，按0岁及以上、>0岁及以上、1岁及以上、>1岁及以上年龄组别（如有）进行统计，记录了自1975年以来在英国境内进行的淡水鱼类调查。备注：- 这些调查数据存储在通常被称为NFPD（国家鱼类种群数据库）的存档中。- 本数据集仅包含淡水鱼类调查数据。- NFPD中持有的第三方数据被排除在本数据集之外。- 一些历史调查（尤其是在安格利亚中部）存在调查长度和调查宽度不正确的情况。这些可以通过调查长度为1且调查宽度等于面积的标识进行识别。调查面积是正确的。这是由于旧的历史数据从先前数据库迁移至NFPD所致。- 已通过AfA347访问批准。- 数据集'淡水鱼类调查（NFPD）'也可能相关，其中包含鱼类长度、重量以及原始年龄数据（如有）。请参阅数据集文档以获取更多详细信息。归属声明：© 环境署版权和/或数据库权利2017。保留所有权利。