Slashdot linked up news that dolphins apparently call each other by name:

Bottlenose dolphins can call each other by name when they whistle, making them the only animals besides humans known to recognize such identity information, scientists reported on Monday.

Since Dolphins are also famous for being so horny the crack of dawn isn't safe (another thing they share with humans), I imagine the conversations are along the lines of "fish and f*ck". Sort of like an angler's tournament, but with fins.