What is that triangular fish in Cozumel/Caribbean?

I have no problem at all.

You seemed to be the one with the problem by attempting to say that we were wrong with the remora answer when that is in fact 100% correct - those are remoras!

In fact, I could say you were wrong as they are also called short-disk sharksuckers - but the point is that, regardless of what you want to call them, they are still remoras!

However, since you seemed to be a stickler for details/pedantics, I was merely pointing out that you had not actually answered the OP's question as the the photo you posted was not the photo that the OP explicitly had asked about...

 

Ah... thanks for confirming that you are the one with the problem.

Look - If you had wanted to build on our answers you could have said something like "yes, it's a remora but, more specifically, it's a whitefin sharksucker" or "Not just a remora, it's a short-disk sharksucker".

Instead you posted a snip from the wrong picture and said "No, it's a Whitefin sharksucker" - implying that the remora answer was incorrect, which it wasn't.

 

when i read the title i thought "trunkfish". nope. wrong.

But on the other hand, remoras are loads of full & entertainment. especially if you can lure one close to the boat ladder. easiest way is to wear a shorty and let them snag onto your calf. head back to the boat early and wait for some other diver to come back. gently grasp the remora and push it forward, it will detach and try to zone in on a new victum.

generally they head for the chest area...

 

Nice - I'm sure your buddies love that

 

According to Reef Fish, there is the remora family and within the family there are three species, two sharksuckers and one also called the Remora. If they have white lines they are one of the shark suckers.

 

My buddy loves it. ***** & giggles for her! (can I say that?) And it is my leg that it is clamped onto, not hers. It is less squishy than an octopus.

The others approaching the boat get a little more excited as they realize that there is this very aggressive water squirrel thing trying to limpet onto their body. Apparently right towards their face. Kind of like Aliens? Lots of backpedaling and hand sculling away from the ladder along with excessive bubble blowing and very big eyes.

Once safely on board, they start to realize what they just encountered. We have had a few jump back in with snorkels to watch the rest of the proceedings.

All round great entertainment. In general, no divers were harmed. Much. The remoras seemed happy.

 

Have had a couple try to attach to me during the safet stop. Both were after a spear fisherman had taken a big cobia so I assume that was where they came from. Interesting looking critters.

 

Give them some bare skin! From watching other divers, they seem unable to successfully attach to a wet suit or BCD.

They can easily attach to human skin (well at least my leg) and are easily removed by nudging them forwards. They do not pierce the skin or leave a mark. Mostly harmless.Mostly Harmless - Wikipedia

 

There some funny videos of diver reactions to remoras on youtube - like this one:



They seem to like heads too: