Norwegian fish farms are shifting towards a more sustainable practice by feeding their salmon a vegetarian diet, primarily composed of plant-based materials, fish oil, and meal, vitamins, minerals, and pigment. This change is driven by concerns over overfishing and limited stocks of small fish used in fish meal. However, this shift has raised environmental and health concerns. An alternative method being explored is the use of Black soldier flies, known for their voracious eating habits, but the higher cost of this method has deterred fish farmers.
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Norway's fish farms are feeding their salmon an increasingly vegetarian diet in order to make their businesses more sustainable, but for these carnivorous pink-fleshed fish, all is not rosy.In submerged cages at the Oksebasen fish farm, located at the crossing of two fjords in western Norway, the salmon are under constant watch on mobile underwater cameras.At the first sign the fish are feeling a little peckish, employees at an operations centre 100 kilometres (60 miles) away turn on a "sub-feeder" which releases special pellets swiftly gobbled up by the hungry fish.The small brown granules consist primarily of plant-based materials, 20 to 30 percent fish oil and meal, as well as vitamins, minerals and pigment to give the salmon's flesh its characteristic pink colour."Before, fish feed was made exclusively of marine ingredients," or in other words, wild fish, explains operations manager Magnulf Giske at the world's largest producer of Atlantic salmon, Mowi."But it's a less ...
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