Protacanthopterygii is a superorder of bony fish inhabiting the sea and fresh water, which comprises the following 4 orders: Argentiniformes, Salmoniformes, Esociformes, and Osmeriformes.
(“Wild Salmon”. William Geddes, 1840–1884)
2 orders (Argentiniformes and Salmoniformes) are found in the Adriatic Sea.
Argentiniformes are small pelagic fish. They used to be included in the Osmeriformes order, but now they are a separate order. 4 species, representatives of 2 families (Argentinidae and Microstomatidae) of the Argentinoidei suborder inhabit the Adriatic.
Salmoniformes includes only one Salmonidae family. The representatives of this family are mostly migratory fish that grow in the seas and enter the rivers to spawn. There is only one species (Salmo trutta) in the Adriatic Sea. It makes a migratory, lake and stream form. Since adriaticnature describes in detail the Salmonidae family in the freshwater fish section, we won’t repeat it in the Adriatic Sea fish section. We won’t describe Oncorhynchus mykiss in this section for the same reason. This fish is bred artificially in sea piscines in particular. It occasionally occurs in the Adriatic, when it escapes from farms.