A class of tetrapod, viviparous vertebrate animals, which are essentially characterized by the presence of udders, hairs, a four-cavity heart, a developed nervous and encephalic system, a constant internal temperature and pulmonary-type respiration.
A species that is indigenous or non-native to a given territory, proliferates and extends its range due to an increase in population density.
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.