Nesting in Volturno river 29 Apr

Nesting in Volturno river

Before sowing, we dedicated ourselves to the construction of nests in the main course and in the sides of the Volturno river. The main course of the Volturno river was heavily hit by the floods of last autumn-winter and, following the monitoring carried out, we recorded a severe depletion of the salmonid population. For this reason, we have given priority precisely to the main trait, planning interventions aimed at repopulating it with embryonic eggs of genetically selected reproducers.

In the natural reproductive period, the female looks for the best backdrop for reproduction, characterized by gravel and pebbles, and cleans an area of ​​varying sizes according to its size with tail strokes. Trout larger than 60 cm can clean areas with a diameter of even 2 meters!

This preparation of the primer precedes the mating with the male (or more males) and the laying of the eggs.  The redd areas are easily identifiable because they appear as lighter oval patches than the surrounding backdrop.

During the artificial construction of the nest, the movement of the gravel of the bottom simulates the natural redd and, observing the river bed, you can see clear areas similar to natural redds. The only difference is that in the center of these clean areas we build a small pile of gravel and stones which increases the protection of the eggs and the early life of newborns.