Meh, Fishing is a collector/completionist class, and any fish that are useful should be considered the exception rather than the norm.

What fishing sorely lacks are actual trophies - there should be tons of craftable trophies stupid titles and achievements associated with these big fish, especially for ones without interesting desynths. Getting all 87 big fish should award the title "Big K'huna" (a legendary miqote fisher `-`) or something equally silly :P