Information collection programmes involving public participation in a scientific process. This participation is carried out in particular for the collection of field observations. An example is the Vigie-Nature participatory science programme founded by the National Museum of Natural History.
A migratory species that migrates down rivers to breed at sea. An example is the European eel.
A migratory species that migrates from the sea to rivers to reproduce. One example is salmon.
An introduced species that meets ecological conditions favourable to its sustainable establishment over time that can establish populations in an autonomous manner and integrated into the ecosystem.
Animal visible to the naked eye (ie larger than 0.5 mm) that does not have a skeleton, bone or cartilage.
Method used to evaluate the abundance of fish species in a portion of a stream and to precise the different populations. It consists in the creation of an electric current which attracts fish. Then, paralyzed by electricity, they rise to the surface, which helps their identification and counts. After a little while, fish are free to circulate in the stream again.
Set of aquatic vertebrate animals which have the characteristic of being viviparous: the female lets the young grow in its belly, from which they get out alive. Marine mammals living in the oceans (cetaceans), as well as various freshwater species, such as the European otter, are aquatic mammals. Their mode of operation depends on the aquatic ecosystem where they live.