08 Jun 2020 --- Industry should monitor the omega 3 content of commercial fish species due to a decline in phytoplankton, which is part of the marine food web and is a primary producer of this nutrient. This is according to a study published in Global Change Biology, which reveals that climate change now forces wild shoals to switch to feeding on smaller organisms of poorer food quality. The researchers now flag the need to examine the wider impacts of shifting global temperatures and whether the changing nutrient supply could lead to reductions in omega 3 across the entire food chain.