Salmonid: in or belonging to the Salmon family, includes Salmon, Char, and Whitefish.
Spawn: The mass of eggs deposited by a fish. In the case of Salmon and Trout these are orange and Red.
Redd: The gravel nest made by a trout or salmon, used for spawning.
Roe: Another word for spawn, but also the milt or sperm of a male fish.
Skein: Eggs in the fish, before they come loose, kept together with a clear membrane.
Fry: A baby salmon, up to 10 weeks old.
Parr or Fingerling: Several Months Old, develops "finger" markings on the side.
Smolt: 1-3 years old.