What's the difference between butterfish and pomfret?

Butterfish

Definition:

(n.) A name given to several different fishes, in allusion to their slippery coating of mucus, as the Stromateus triacanthus of the Atlantic coast, the Epinephelus punctatus of the southern coast, the rock eel, and the kelpfish of New Zealand.

Example Sentences:

(1) While we sat on the shore eating our lunch we watched the otter tucking into a butterfish with the same enthusiasm – and completely oblivious to our presence.
(2) In the butterfish, cod and rockling, all the oxygen absorbed by the skin is consumed by the skin tissue itself, whereas in the other species there is a net inward transcutaneous oxygen flux.
(3) were investigated in seven species of teleosts in normoxic sea water: butterfish (Pholis gunnellus L.), cod (Gadus morhua L.), five-bearded rockling (Ciliata mustela L), shanny (Blennius pholis L.), flounder (Platichthys flesus L.), sole (Solea solea L.) and eel (Anguilla anguilla L.).
(4) Although MPS-II possessed many radiologic similarities to MPS-I, the former presented certain characteristic features such as butterfish-like vertebra, and small triangular malformation of carpal bones and tarsal scaphoid etc.
(5) Bacterial decomposition of butterfish and smelts in small sealed jars containing seawater and other solutions, for periods ranging from 65 to 205 days, results in a large increase in concentrations of dissolved bicarbonate, carbonate, and ammonia (plus volatile amines).

Definition:

(n.) One of two or more species of marine food fishes of the genus Stromateus (S. niger, S. argenteus) native of Southern Europe and Asia.
(n.) A marine food fish of Bermuda (Brama Raji).

Example Sentences:

(1) Other high-profile cases include the expulsion of Andrew Higgins of the Independent in 1991, and two American reporters, Alan Pessin of the Voice of America and John Pomfret of the Associated Press, after their coverage of events in Tiananmen Square in 1989.
(2) Illawarra Regional Information Service executive director Simon Pomfret says unemployment in the Illawarra could take at least two decades to be back to the national average, but Shoalhaven has a much bleaker outlook.