Invasive species in Seine-et-Marne

Black-spotted gobies, originally from the Black Sea and the Caspian Sea, have been found in Seine-et-Marne's waterways for two years and are spreading quickly because of their high reproductive rate and ability to adapt to different environments. The species was first spotted in the Héricy area and is thought to have reached the region via the Rhine-Danube canal, according to Jean Dey, president of the environmental and fishing association Le Grand Barbeau, as reported by BFM.

Arrival through trade infrastructure

The black-spotted goby likely reached the Paris region through cargo ships and barges that discharged ballast water containing their eggs and young. These fish were not intentionally introduced but arrived through infrastructure designed to facilitate trade, such as canals and shipping routes.

Physical characteristics of the goby

The black-spotted goby is a small fish, measuring between 10 and 20 centimeters. It is identifiable by a distinctive mark on the back of one of its dorsal fins. This feature helps distinguish it from other similar species in the area.

Impact on local biodiversity

The arrival of black-spotted gobies is affecting the biodiversity of the Seine-et-Marne region, with potential negative consequences. Local fish species such as the roach are becoming rarer, as they face competition from the invasive gobies, which are highly voracious and consume a large number of fish eggs.

Uncertain long-term effects

At this point, the long-term impact of the black-spotted goby's proliferation is unknown. Scientists and environmentalists are monitoring the situation closely to better understand how this species will affect the local ecosystem over time.