In Rouen, the fish nurseries at the marina house hundreds of juveniles

In Rouen, the fish nurseries at the marina house hundreds of juveniles
In Rouen, the fish nurseries at the marina house hundreds of juveniles

There are people in the locker that Etienne Abadie, one of the company’s divers, has just brought to the surface. Ecocean who developed the device. 400 small animals who found accommodation and protection inside these 22 metal cages filled with oyster shells hanging under the docking pontoons of the Rouen marina. Several species of small shrimp and European eels of different sizes. Juveniles that must be counted and measured before replacing the trap and putting them back in the water.

The return of European eels

Among these small animals, a dozen small eelsten times more than last year during the previous survey and it is a good surprise according to Manuel Muntoni, ecologist at Seine-aval public interest group. “This is a very good sign since the vegetation has established itself well, the entire component of the food chain has established itself well from algae, moss and this has allowed other organisms to settle in. small shrimps and other types of arthropods This is a sign that this environment is effective since the objective is to imitate nature. notes the specialist.

A sign that the water quality of the Seine is improving

This will not allow the species to recolonize the Seine, and to be as abundant there as before, but it is a sign of an improvement in the environment. Hugo Langlois, metropolitan councilor delegated to the Seine axis and biodiversity. “The objective is to show that the quality of the water of the Seine is improving that it is not as bad as we can say and then it is also to find devices so that emblematic species of our river are reestablishing and proliferating.
The experiment will continue for a few more years, with annual surveys and regular observations to precisely identify the number and nature of the inhabitants of these biohuts.

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