I wanted to take time to dredge up as many memories as I could on this and let them settle down as to being just conversations on CoB or something that was possible but was taken away.
My belief is they are memories of just a conversation on CoB.
That people wanted to be able to tame them, then started the aspects of people Taming Flipper and feeding them to the Sea Serpents, the Water Elemental's, no place to stable them etc.
The only but to the above is I have a memory of starting to tame a Dolphin but never ever being able to succeed as the difficulty in trying to maintain a taming relationship to it was .... well perhaps impossible. I give this memory nearly a ZERO in credibility, it would be after all nearly 12 years old.