For a spawning area to be functional, and allow plant growth and water warming, it must not be too deep (between 20-60cm). The development from egg to larva depends on temperature. As such, it’s necessary for the water to warm-up quickly during early spring. This is particularly related to the depth of the water and the opening up of the environment (no trees). The submersion has to last at least 1 and a half to 2 months.
The laser made it possible to determine the difference of level between the Menophe river bed and the actual ground of the future spawning area. It appeared that 50 cm of ground would have to be removed around the deepest strip. The digger will have to create a gentle slope between the bottom and the actual ground.
During the works, the laser will allow us to check the slope between upstream and downstream of the spawning ground, ensuring that the pikes do not get trapped there and are unable to regain the stream.
To be continued...