After the New 52, Geoff Johns decided to completely revamp Aquaman to make him a more straightforwardly "cool" character. One of the ways he did this was to add a trident to his weaponry full time and another way was to disabuse people of the notion that Aquaman actually directly TALKS to fish (as shown in Aquaman #1 by Johns, Ivan Reis and Joe Prado)...
Recently, it was established that Aquaman also has a special connection to all living things on Earth, but that just explains HOW He has the power he has, it doesn't really change how he actually communicates with fish, so I'm not going to feature that revelation here.
Thanks to Fraser for the suggestion!
If anyone else has a suggestion for a future Abandoned an' Forsaked, drop me a line at email@example.com!