yolk sack
21button-up fry — a salmonid fry that has not completely absorbed its yolk sac and has emerged from its spawning gravel (stages at 45°F in chinook salmon are green 0 days, eyed 38 days, sack fry 69 days, swim up 92 days and button up 115 days) …
22sac fry — a newly hatched fry using the yolk sac as a food source (stages at 45°F in chinook salmon are green 0 days, eyed 38 days, sack (or sac) fry 69 days, swim up 92 days and button up 115 days) …
23swim-up fry — fry that have absorbed their yolk sac, are ready to start feeding and rise to the surface to gulp air into the swim bladder (stages at 45°F in chinook salmon are green 0 days, eyed 38 days, sack fry 69 days, swim up 92 days and button up 115… …
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