Marine derived nutrients in natural and model systems in eastern North Americas
Back in 1967 the nitrogen brought into the Saint John system by Atlantic salmon was the equivalent of 960 cows for one day. Now a 12th of this.
Looked at how marine-sourced nutrients were taken up in rivers, and found that where the marine-sourced nutrients prevailed, there were many more invertebrates.
This resulted in bigger salmon parr, and healthier salmon parr.
Particularly the Omega 6 fatty acids resulted in increased brain size during development.
It was important that the nutrients were in biological form rather than inorganic nutrients.
The nutrients only affect a very small zone in a stream, so researching the impact, one needs to focus efforts.