Alvien lose their sacs,and emerge from the gravel as fry in May and June. About an inch (2.5cm) long,they are free swimming,and are easy prey for larger fish. In the river,or a nearby lake,depending on the species, they feed and grow for periods ranging up to a year or more. DESCRIPTION Fry are brow with tiny little black spots and have a hint of silvery white near their eyes.they have black eyes. THREATS Larger fish Humans (dams,waste,etc) Floods Etc.