<Li> Fingerling--refers to a fish that has reached the stage where the fins can be extended and where scales have started developing throughout the body . In this stage, the fish is typically about the size of a finger . </Li> <P> Fry and fingerling are terms that can be applied to juvenile fish of most species . But some groups of fishes have juvenile development stages particular to the group . This section details the stages and the particular names used for juvenile salmon . </P> <Ul> <Li> Sac fry or alevin--The life cycle of salmon begins and usually ends in the backwaters of streams and rivers . These are the salmon spawning grounds, where salmon eggs are deposited for safety in the gravel . The salmon spawning grounds are also the salmon nurseries, providing a more protected environment than the ocean usually offers . After 2 to 6 months the eggs hatch into tiny larvae called sac fry or alevin . The alevin have a sac containing the remainder of the yolk, and they stay hidden in the gravel for a few days while they feed on the yolk . </Li> <Li> Fry--When the sac or yolk has almost gone the baby fish must find food for themselves, so they leave the protection of the gravel and start feeding on plankton . At this point the baby salmon are called fry . </Li> <Li> Parr--At the end of the summer the fry develop into juvenile fish called parr . Parr feed on small invertebrates and are camouflaged with a pattern of spots and vertical bars . They remain in this stage for up to three years . </Li> <Li> Smolt--As they approach the time when they are ready to migrate out to the sea, the parr lose their camouflage bars and undergo a process of physiological changes that allows them to survive a shift from freshwater to saltwater . At this point the salmon are called smolt . Smolt spend time in the brackish waters of the river estuary while their body chemistry adjusts (osmoregulation) to the higher salt levels they will encounter in the ocean . Smolt also grow the silvery scales which visually confuse ocean predators . </Li> <Li> Post-smolt--When they have matured sufficiently in late spring and are about 15 to 20 centimetres long, the smolt swim out of the rivers and into the sea . There they spend their first year as post-smolt . Post-smolt form schools with other post-smolt and set off to find deep - sea feeding grounds . They then spend up to four more years as adult ocean salmon while their full swimming and reproductive capacity develops . </Li> </Ul> <Li> Sac fry or alevin--The life cycle of salmon begins and usually ends in the backwaters of streams and rivers . These are the salmon spawning grounds, where salmon eggs are deposited for safety in the gravel . The salmon spawning grounds are also the salmon nurseries, providing a more protected environment than the ocean usually offers . After 2 to 6 months the eggs hatch into tiny larvae called sac fry or alevin . The alevin have a sac containing the remainder of the yolk, and they stay hidden in the gravel for a few days while they feed on the yolk . </Li>

What is the name given to a young salmon
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