Some fishes have bizarre high rate of escape for no reason other than to make you get frustrated. I don't know why SE thinks they are good design but as proven by some posters they provide significantly unfair advantages to people that quite literally, get lucky and get them on their first few bites. Why unfair? Because the best fishing rod is locked behind catching 106 different big fish out of 112 available and if you get lucky with these dumb fish that seem to have over 80% escape rate, you get free pass to a rod others get stuck trying to get specific fish and fail 40 times.

As for the 2.4 fishing speculation thread, the two opening posts have A LOT of misleading information and drastically incorrect gathering/perception requirement. I do NOT recommend the thread at all if all you are going to do is read the pretty formatted OP posts. The recommended urls are much much better and provide more accurate information.

That said, the most well known high rate of escape fishes that I know of are: Green Jester in Central Shroud, Cornelia in North Shroud. The Matriarch in Coerthas, The Terpsichorean in Eastern La Noscea and Iron Noose in Southern Thanalan.