Can you narrow your question a little? What kind of info do you want to know? Yes there is a brackish fish called a Scat, it is actually a genus. It consists of 4 known members, the Green, Red/Ruby, Silver, and African. They all start in brackish water and migrate to saltwater as they age so they will need to be in saltwater as adults. They are a schooling fish which means you need a bare minimum of 3 of them. They are a rather large fish attaining any easy foot long some up to 18". They are a herbivore so need lots of algae and the like in their diet. Anyway, hope this helps and good luck!