About 30 species within the arctic regions belonging to the families Petromyzontidae, Acipenseridae, Anguillidae, Clupeidae, Osmeridae, Salmonidae, and Gasterosteidae exhibit diadromous behavior (i.e., spend part of their lives in the marine environment and migrate to freshwater to spawn, or the converse).    From Wordnik.com.  [Effects of climate change on arctic anadromous fish] Reference

The fish family Acipenseridae, more commonly known as sturgeon, is now the most endangered group of animals.    From Wordnik.com.  [New Scientist - Online News] Reference

Hatchery Manual for the White Sturgeon: With Application to Other North American Acipenseridae (Publication) by Fred Sequin Conte.    From Wordnik.com.  [OpEdNews - Quicklink: Gov. proposes selling L.A. Coliseum, other properties to raise cash - Los Angeles Times] Reference

Juveniles are eaten by flatworms (Platyhelminthes), leeches (Hirudidae), and crayfish as well as an array of freshwater fish including carp (Cyprinidae), sturgeon (Acipenseridae), catfish (Ictaluridae), and sunfish (Centrarchidae).    From Wordnik.com.  [Freshwater mussels in North America - factors affecting their endangerment and extinction] Reference