Salmon exposed to algal-produced neurotoxins show changes in both their brain activity and general behaviour. It has also been found that very small doses of these toxins can have an affect on how salmon relate to other fish.
Transmission of infection from neighbouring fish farms is the main way that the viral disease Infectious Salmon Anaemia (ISA) spreads during epidemics. This is the key conclusion of Trude Lyngstad's doctoral research.
This article by Peter S. Rand and B. A. Berejikian et al, from the Wild Salmon Center in Portland, Oregon, US, and the NOAA Northwest Fisheries Science Center, looks at the ecological interactions between wild and hatchery salmonids.
Using fishmeal to feed to fish in aquaculture fisheries could prove to be unsustainable in the long run as the aquaculture industry grows and ocean fish stocks diminish, write Chris Harris.
