Here are some links to information which you will find helpful and concise.
Scuba Diving Hand Signals
Click Here for Equipment Maintenance Tips
Scuba Diving Hand Signals Every Diver Should Know
Flying After Diving
Never Hold Your Breath!
10 Tips for Underwater Photographers
Seafood Watch downloadable pocket guides
Seafood Watch Website
Monterey Bay Aquarium
Aquarium of Boise
Shark Finning - madness that has to stop!