THE COVERS
Articles & Editorials
November 2010 Volume 20 Number 11
    

Photos by Barry & Ruth Guimbellot

They’re beautiful to behold, but not in Caribbean waters. This month’s cover feature, “Killers on the Loose: Lionfish Continue Wreaking Havoc on Caribbean Reefs,” explains how lionfish are wrecking local ecosystems.
FEATURES
20
Killers on the Loose:
Lionfish Continue Wreaking Havoc
on Caribbean Reefs
There’s been a lot of talk lately about invasive Indo-Pacific lionfish making themselves at home in the Atlantic and Caribbean. It appears they’ve established permanent residency, which is bad news for the locals. The author explains why the lionfish invasion is such a big deal and what’s being done to rid them from local reefs.
By Alex Brylske
30
Can You Hear Me Now?
The Science of Sound Underwater
Sound will travel through virtually any substance, including solids, liquids and gases, but how it travels varies depending on the medium it travels through. This article explains the science behind why sound — and how scuba divers perceive it — is different underwater than it is on dry land.
By Robert N. Rossier
40
Honorable Mention:
An Etiquette Lesson for Divers
There are all types of etiquette; in addition to dining etiquette and table etiquette there are business etiquette, wedding etiquette, funeral etiquette and more. There is etiquette for just about everything. So what about scuba etiquette? How do divers learn what is expected and how to function harmoniously with fellow divers and the environment, and perform within the social norms?
By Lynn Laymon
COMMENTARY
8
Editorial: Everybody’s Backyard
By Mark Young
10
Buddy Lines:
Medications and Diving
 
12
Dive Observer:
Whale of a Find
By Gene Gentrup
80
No Dumb Questions: Equipment Questions and More on
Fitness for Diving
Questions from our readers
By Alex Brylske
DIVE EXPLORATION
62
Global Dive Exploration Map
A geographical guide to great dive destinations across the globe
 
64
Dive Geo: Cayman Brac is Back!
A Cayman Islands Favorite, Made Even Better
Paradise and a fresh coat of paint
By Karen and Ian Stewart
70
Passport:
Dive travel deals from all over
Compiled by
Gene Gentrup
72
Diving USA
Dive travel opportunities across America
 
EVERY MONTH
49
Scuba Skills: Down and Back on a Single Breath:
Surface Dives Made Simple
Tips for snorkeling success
By Lynn Laymon
53
Instructor Tips: Wrapping It Up:
Using Debriefings to Improve Your
Students’ Learning
A post-dive teaching opp
By Greg Laslo
57
Always Learning: Diving With Daniella:
Evidence of a Changing World
When change is good
By Marty Snyderman
83
On the Go?
Dive Training readers now have another way to access information on their favorite diving topics. Use your cell phone or personal device to scan and read articles on several subjects featured in Dive Training magazine.
 
84
Dive Shop
Compiled by
Gene Gentrup
86
What’s That?: Icons of the Gulf of Mexico:
The Great Barracuda, Green Sea Turtle,
Whale Shark and Bottle-nosed Dolphin
A visit with our favorites
By Marty Snyderman
89
Premier Classifieds
 
90
Behind the Lens: The Lowdown on Macro
The close-up challenge
By Marty Snyderman
93
Dive Training Classifieds
 
97
Dive Training Quiz
Test your knowledge of the information in this month's issue
 
98
Final Check: You HELP Yourself
A warm hug can help
By Linda Lee Walden
By Lynn Laymon