Small fly: the infant fish which has just hatched from the spawn , still not take on the characters to make a distinction of themselves. And most of them are bluer.
Foung fish : the baby fish which have the total length more than 3CM.
Fish in this year: all norms of the fish just hatched from the spawn in this year.
One year fish : the mature fish which is one year's old.
Two year fish :the mature fish which is two year's old ,and three year fish ,four year fish, etc.
Parent fish: the mature fish selected for reproduction. usually, it should be older than 1 year.
Autumn fly: the small fly hatched from the spawn laid in autumn.