Alevin- a newly hatched salmon with its yolk sac still attached.
Embryo - the tiny living thing inside a fertilized egg.
Environment - everything surrounding a living thing that affects
the way it grows or develops.
Eyed egg - a month-old egg at the stage when the embryo's large,
dark eyes can be seen through the egg.
Fertilize - to combine sperm with an egg to create new life.
Fish ladder - a series of pools arranged like steps so that a fish can
jump up from one to the next.
Fry - baby salmon that have used up their yolk sacs and are ready
to find their own food.
Gill - the organ that fish use for breathing.
Hatch - coming forth from an egg.
Milt - sperm-filled fluid sprayed by a male fish to fertilize eggs.
Plankton - tiny organisms that float or drift in the sea.
Pollution - whatever poisons or destroys the cleanliness and purity
of air, earth, or water.
Redd - the hole (nest) in the bottom of a stream in which a female
salmon lays her eggs.
Smolt - young salmon that is ready to migrate to the ocean.
Spawn - to lay eggs or fertilize them.
Sperm - the seed of life in a male which combines with an
egg to produce an embryo.
Watershed - the drainage area around a stream or river.