Fish stock of all species PTE

Fish stock of all species PTE

These surveys, covering all species except lampreys, are generally carried out in late September or early October at sites along the River Oir and its two tributaries, the Moulinet and Roche streams.

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The fishing method used involves depleting the population through two passes. Densities are estimated using the Seber and Le Cren formula, taking into account the numbers recorded during the two passes. These densities are expressed as the number of individuals per 100 m².
All fish caught are measured (Lf to the nearest mm), weighed (Pds to 0.1 g) and sexed. Scales are collected from salmonids and chub, for which age estimation based on size is difficult. All eels caught are individually tagged with a PIT tag, and the presence of tags is noted for all species.

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