Vitamin D supplementation can improve fish welfare, human health

The role of vitamin D is often underappreciated across species, from humans to farmed salmon, experts said in a recent webinar from DSM-Firmenich.

Dr. Ann-Catrin Adam, researcher at the Institute of Marine Research in Bergen, Norway, said vitamin D levels in Norwegian salmon feed have been declining over the past two decades, a trend driven largely by the replacement of marine ingredients with plant-based alternatives. Average dietary D3 in salmon feed has fallen from nearly 0.8 milligrams per kilogram (mg/kg) to approximately 0.11 mg/kg, she said.