Cozumel Underwater 4

Cozumel - Rainbow Parrotfish
An enormous Rainbow Parrotfish Scarus guacamaia

Just like our own Blackfish, large adults do not like to be approached. The small fish at the lower left is a Schoolmaster Lutjanus apodus.

Cozumel - Angelfishes
With the 1/2 second shutter lag of the digital camera, you could never deliberately set up an action shot like this. This is a happy accident.
Cozumel - Angelfishes
This school of Angelfishes was so intent on devouring this big Basket Sponge Xestospongia muta that they took no notice of me.
Cozumel - Angelfishes
All I had to do was swim up current, and snap away!
Cozumel - Angelfishes
This one is completely upside-down.
Cozumel - Thimble Jellyfish
Thimble Jellyfish Linuche unguiculata. Normally, red jellyfish are the kind you don't want to see but these little ones didn't seem to sting at all.
Cozumel - Sand Tilefish
Sand Tilefish Malacanthus plumieri

There aren't too many places in the tropics where pure white is actually camouflage. Related northern Tilefishes live much deeper, beyond the range of divers.

Cozumel - Tobaccofish
A small coral head with a Tobaccofish Serranus tabacarius, a kind of basslet, in front of a Giant Tube Sponge Aplysina lacunosa. Black fingers in the background are probably Common Bushy Soft Coral Plexaura homomalla.
Cozumel - Tobaccofish
Nearly the same scene, with the fish moved around. Add a Chromis and some Damsels.
Cozumel - Sargassum Triggerfish
Sargassum Triggerfish Xanthichthys ringens. The three stripes on the cheek are the best identifying mark, as the colors are otherwise variable.
Cozumel - Porkfish
Porkfish Anisotremus virginicus
Cozumel - Stoplight Parrotfish
Another Stoplight Parrotfish, with glorious colors.
Cozumel - Damselfish
The fearsome Damselfish again.
Cozumel - Damselfish
Defending its turf.
Cozumel - Damselfish
I get no respect. Who named these things, anyway?

Unlike most reef fish, which eat the coral directly, Damselfish are farmers. They clear off a small patch of reef and grow algae on it, which they then feed on. They will defend their patch fearlessly - I have actually been bitten! ( It didn't hurt. )

Cozumel - Queen Parrotfish
Queen Parrotfish. Scarus vetula
Eatin' coral, and poopin' beach sand. Yep.

Most of the fishes on the reef actually feed on the coral, gnawing on it all day, every day. One thing that you can deduce from this immediately is that coral must be a lot more resilient than some hysterical ecologists* would have you believe.

Does this mean it's ok for you to go bashing into it? Hardly. Always try not to touch or break the corals and sponges you see, but if you occasionally have to put a finger or two down on something solid, don't lose too much sleep over it.

I try never to touch anything on the reef because I don't know offhand which things sting and which ones don't, and some of them can really ruin your day!

* Not all ecologists are hysterical.

Cozumel - Blue Tang
A brilliant Blue Tang. The photo is completely untouched.
Cozumel - Featherduster Worm
Featherduster Worm Sabella
Cozumel - Princess Parrotfish
My best guess is that these are baby Princess Parrotfish Scarus taeniopterus, about 3" long.
Cozumel - Ocean Triggerfish
Ocean Triggerfish Canthidermis sufflamen with Bar Jacks
Cozumel - Fire Worm
Fire Worm Hermodice carunculata
Notice the tufts of white bristles underneath.
Leave this critter alone.

Thanks to Dr Matt Landau - MLandau@stockton.edu
of Stockton University Biology Department
for identifying many of these creatures.


Ribbon Louse
Copepod

Most copepods are harmless plankters or bottom dwellers. In fact, copepods are the most numerous of all crustaceans in terms of both species and population. However, since they generally range in size from 1/16" to 1/2 ", they are not of much interest to divers.

The Ribbon Louse ( Lernaeenicus spp. far right, 1 inch to 1 foot ) is a fish parasite. I have observed these bizarre creatures only in the aquarium. The head ( at lower left ) is buried in the body of the host, while the worm-like body hangs outside. Only the twin tails betray its true and almost unrecognizable nature - this is a copepod crustacean. And this is not even the extreme of crustacean evolution - some parasitic barnacles live completely inside their host, actually melding with the host's flesh until the two are inseparable, like some kind of science fiction nightmare.

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