Refers to fish that migrate from river waters to the sea or vice versa, once or several times during their lifetime. We can distinguish anadromous species that migrate up rivers to reproduce and catadromous species that most often live in fresh water and will reproduce at sea.
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.
Farming of filter-feeding molluscs of the family Mytilidae called "mussels", more often marine mussels (by distinction of freshwater mussels).
Animal visible to the naked eye (ie larger than 0.5 mm) that does not have a skeleton, bone or cartilage.
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.
Articulated invertebrate animal which have the characteristic of breathing through trachea. Some insects have become aquatic (representing 3% of insects) but have retained this aerial breathing.