What did Brandon see at the aquarium?

I recently captured this photo of the hubby while we were at the Denver Aquarium.  Just look at his face, its got childlike wonder written all over it.  Can you guess what caused it?

Was it a sea star scaling the tank walls...

Or an otter swimming playfully in circles....

Perhaps it was that hot scuba girl they passed on their way in...

Or the stingray showing off his good looks...

Speaking of good looks, maybe he caught his reflection...

But it could have been the ugly fish...

Or the pretty fish...

Or even the fear-inducing shark jaws...

I bet it was the tranquil little jellyfish that looked like boobies...

But, alas, no...

It was the mermaid.  

(duh.)