Frequently Asked Questions
"Why do farm-raised salmon come to the surface?"
Salmon come to the water’s surface for a number of reasons, they will often come to the surface to gulp air to refill their swim bladders, these help the fish to maintain neutral buoyancy in the water. They will also leap occasionally, the reasons for this behaviour are not fully understood. It is a behaviour common to both wild and farmed Atlantic Salmon.
The behaviour is not driven by sea lice, as the fish do it with or without sealice on them. Experience has shown that environmental factors such as low dissolved oxygen levels because of plankton and/or an algae bloom near the farm site can sometimes cause a reduction in the salmon leaping. Farm conditions are monitored regularly and when this occurs aeration technology is used to increase oxygen levels when required.
Looking for more information? Find out more below:
"A low dissolved oxygen (DO) situation can be a result of high plankton mass, high water temperatures, or an up welling of deeper low oxygen water."Aquaculture North America
Combating algae growth and low-oxygen levels
"Virtually every coastal country in the world is affected by harmful algal blooms (HABs, commonly called “red tides”). These phenomena are caused by blooms of microscopic algae."Donald M. Anderson
Approaches to monitoring, control and management of harmful algal blooms (HABs)