When young salmon hatch from their eggs, they are called alevins. Here are some other terms related to young salmon:

• Parr: A young salmon that has developed vertical stripes on its sides to camouflage it from predators.
• Fry: A young salmon that has absorbed the yolk sac.
• Smolt: A young salmon that is ready to migrate from freshwater to saltwater.
• Grilse: A young salmon that has returned to freshwater after spending one winter at sea.
• Samlet: A young salmon that has spent one winter at sea and returned to freshwater.

Therefore, young salmon are called alevins when they hatch from their eggs.