Trichonis dwarf goby
(Economidichthys trichonis)

The smallest European freshwater fish; endemic to lakes Trichonis and Lysimachia of the Acheloos drainage. It inhabits mainly the sublittoral zone and lives in the water column, feeding chiefly on planktonic prey.

It is locally abundant in areas with dense submerged aquatic vegetation forming tight shoals congregating near the bottom. It is a sexually dimorphic species and exhibits parental care behaviour, with the male constructing nests in the cavities of reeds, guarding the eggs until they hatch.

It has an annual life cycle and reaches a maximum of about 3 cm TL.