bacame the proper plural form of the word [fish]?

I know...wtf made ya think of that horsepwr?.. I just opened a pack of gummy fish for my daughter and I said 'fishes' just because I say stuff messed up sometimes. or not really messed up, but just differently than how I say it, so, when I said 'fishes' it reminded me of when that became officially correct. It was like '83-'84. And wasn't there another one like that that got okay'ed as proper English around that time?