This was a beautiful book I read a lot as a kid, so it definitely existed in 1984. The pictures were very colorful, perhaps made with colored pens or pencils & watercolors. 

The story is about a boy with blonde hair who lives near a beach and he goes out snorkeling or swimming. It looks like Florida or the Caribbean. There are many gorgeous pictures of underwater scenes. He finds a pink conch shell containing a pearl that is part of the treasure search I think…..

At one point he encounters a school of barracuda fish and it’s full of tension. I believe he is threatened by a porpoise at one point, and a dolphin comes to his defense… or maybe the porpoise saved him from the barracuda? The fish don’t talk or anything, the only thing “fantasy” in nature is that the dolphin came to save him.

It’s hard to remember! But the final scene is he finds the treasure in what looks like a little tide pool in the sand and the gold & jewels are sparkling in the sun. Please help me find this so I can share it with my child! Thank you.

At one point in the story, They see a shipwreck and find a pearl (perhaps from the conch shell). Something scares them, maybe the shark – and they drop the pearl. But a little seahorse catches it in the curl of its tail.