Trout are closely related to salmon and char (or charr): species termed salmon and char occur in the same genera as do trout (Oncorhynchus - Pacific salmon and trout, Salmo - Atlantic salmon and various trout, Salvelinus - char and trout). Most trout such as lake trout live in freshwater lakes and rivers exclusively, while there are others such as the rainbow trout which as such live out their lives in fresh water, or spend two or three years at sea before returning to fresh water to spawn, being called a steelhead (a habit more typical of salmon). Arctic char and brook trout are part of the char family.
The thick-bodied blue gropers have peg teeth, heavy scales, large tails and thick lips. Juveniles are brown to green brown. Adult females are brown to greenish-yellow. Each scale may have a darker red spot. The adult males have the bright blue colouring that give the fish their name. The blue can range from deep navy to cobalt blue, and there may also be darker or yellow-orange spots or lines around the eyes. All blue gropers begin life as females. As they mature, they go through an initial phase, in which they may be male or female, before developing their adult colouring and reaching the terminal phase. Typically you will only find one or two male blue gropers in an area, with a larger number of the female gropers in the same area. Should the dominant male blue groper die, the largest female will grow, change colour and sex, and become the dominant male..
Barramundi is a loanword from an Australian Aboriginal language of the Rockhampton area in Queensland meaning "large-scaled river fish". Originally, the name barramundi referred to saratoga and Gulf saratoga. However, the name was appropriated for marketing reasons during the 1980s, a decision which has aided in raising the profile of this fish significantly. L. calcarifer is broadly referred to as Asian seabass by the international scientific community, but is also known as Australian seabass.