Brown male, large. Together with large female, brownish/white striped. Depth: 17m/55ft. Bonaire, divesite: Lighthouse point
Here is a picture of a sea cucumber from Venezuela. It was originally posted on Flickr under Creative Commons licence, then transferred to Wikipedia Commons. Somebody identified it as "Holothuria mexicana", but to my eyes it does not look like H. mexicana. I would say "Isostichopus badionotus", but I am not an expert of Caribbean species... Thanks for ID !