Yes! @thegreenwolf is correct. Jaguars do like to swim and will often willingly hunt in water (there’s some kick-ass videos of them ambushing crocodiles from the bank of the river, you can check out).
This looks probably like the jaguar is diving for some sort of enrichment – maybe frozen fish or a bone – and chewing it on the way back up. It’s a great way to encourage captive cats to utilize natural behaviors and get some exercise by having them swim to get high value items.
Pride, Prejudice and Mail Order 