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Put my left hand into a fist and have my right hand completely open. Bang on the fist (on the flat part where your thumb and pointer finger meet) with the very center of my right hand. If you do it right it makes a pretty loud sound underwater.

A recently graduated fella like myself, who ended up with a bachelor's in psychology, is working as an IT guy and has a (nearly impossible) dream of getting into marine biology? I have a burning interest in the field but, time and money aside, I have a crippling fear of chemistry. Organic...

Do fish have stomach acid?

This is the one I'm considering for my first dive computer. Only cons are: No nitrox, no backlight and no audible alarms. http://www.diveaeris.com/p_computers_xr1.html

Sounds like they might be epitokes. They come in a lot of shapes and sizes. A bit of discussion on them here: http://www.scubaboard.com/showthread.php?t=98594

They have a setup at cozumeleno via Ocean-tours http://www.cozumel-diving.net/oceantur/ Since we'll be staying at Melia, it'll be nice to have a dive op next door. Especially one that far north.

Any news from Scuba-Du at El Cozumeleno? I was trying to get in touch with them to make reservations for the middle of August but they never got back to me, then the hurricane hit. I'm curious to know if they made it through.

I really appreciate all the fantastic advice everyone has given. I have some good info to work with now. One question to bcaderunr: Are you sure Scuba-Du is still located at El Cozumeleno? According to their website they're now located at Hotel Presidente Inter-Continental, which is much...

Weird how every recommendation has the word "blue" in it :)

Oh, if it makes a difference, we will be at the Melia Cozumel. I realize nobody will come pick us up that far north, but I assume we can take a taxi to San Miguel and be picked up from there, right?

I'm heading to Cozumel in August. My girlfriend and I will have just completed our open water certification and dont want to ruin anybody's dive due to our inexperience. Does anyone know, of all the Coz dive ops, which one would be best suited to people as new as ourselves?

I dont believe plankton actually has nematocysts, but thats just based on what I recall.

http://www.fau.edu/safe/sea-lice.html "larval form of Linuche unqui culata, also known as a "thimble jellyfish"

I would also add that congregation en masse tends to dilute one's chances of being eaten and that congregating around any kind of cover (reefs, wrecks, rocks) is generally safer than open water.

Doesnt your heart have to work much harder even at minimal depth? While you arent moving as much your heart may well be working overtime.

Acanthaster planci

I would watch small-scale epitoke swarms in my reef tank back when I had it. Fun part was shining a flashlight into the tank and watching them all come straight towards it. This was also the best time to try and spot the enormous foot-long bristleworms and try to photograph them. I vaguely...

Actually that sounds alot like an epitoke swarm. Basically a bit of tail filled with egg or sperm thats been released from a benthic polychaete. They release them en-masse, usually at night time in order to make more polychaetes.

Heh, thats fantastic. Thats the exact same setup I just bought. Good to know I can get decent pics out of it.

Well, you obviously wont be taking wide-angle shots so you're pretty much limited to super-close macros. You could probably find a point and shoot 4MP camera and housing for around or a little over $200. Then all you need to do is get super close to your subject and take your picture.