New article: “Co-farming rainbow trout (Oncorhynchus mykiss) and sea lettuce (Ulva fenestrata) increased macroalgae protein content and positively affected fish welfare”
Co-cultivating rainbow trout and sea lettuce in the same system has a positive effect on both organisms and also improves water quality. The protein content of sea lettuce increased by 25–30% during four weeks of co-cultivation, and the algae contributed to a higher pH level. The experiments suggest that a larger amount of sea lettuce should be used in relation to the amount of water and fish. Visible welfare indicators improved, including fewer wounds on the noses of the fish in the experiment.