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Cold water

January 2010

Hatchery-Raised Salmon Too Crowded

Health Welfare Salmonids

Every year, large amounts of hatchery-raised young salmonids are released into Swedish rivers and streams to compensate for losses in natural production. However these fish rarely survive. The University of Gothenburg has discovered why: the young fish are too…

Crawfish biology

Breeding & genetics

The crawfish or 'crayfish' industry is continuing to grow in certain areas of the world. This article looks at the life cycle, burrow requirements, molting and nutritional needs of two specific species - the red swamp crawfish and the white river crawfish.

Farmed Salmon Are Changing Genetics

Breeding & genetics

It's known that escaped fish from Norwegian salmon farms can interbreed with wild salmon, and thus must have changed the genetic and physical makeup of the country's famed wild salmon stocks, says the Norwegian University of Science and Technology (NTNU).