Underwater camouflage is the set of methods of achieving crypsis, avoidance of observation—that allows otherwise visible aquatic organism to remain unnoticed by other organisms such as predators or prey, and also aids predators in capturing their prey.
Three main camouflage methods predominate in water: transparency, reflection, and counterillumination. Transparency and reflectivity are most important in the top 100 metres of the ocean; counterillumination is the main method from 100 metres down to 1000 metres; while camouflage becomes less important in the dark waters below 1000 metres.
Camouflage in relatively shallow waters is more like terrestrial camouflage, where additional methods are used by many animals. Using color and shape changes, and sometimes adapting to threats with blinding speed, marine species use a variety of tricks to confuse and outsmart likely predators. Some marine animals also use camouflage to lie in wait for prey, which provides the hunters with the element of surprise and conserves valuable energy.
For example, self-decoration is employed by decorator crab, mimesis by animals such as the leafy sea dragons, countershading by many fish including sharks, distraction with eyespots by many fish; active camouflage, through ability to change colour rapidly in fish such as the flounder, and cephalopods including octopus, cuttlefish and squids.
The camouflage color or pattern can be inherited or acquired – many fish and some invertebrates are able to change color to match their surroundings. Other animals achieve camouflage by covering themselves, such as by burying in sand, or by attaching foreign objects to their body or shell.
Underwater camouflage picture gallery.
The jawfish are masters of architecture. They use their large mouths to scoop sand from the seabed and then spit it out to one side. They continue to dig until they have created a vertical tunnel with a chamber at its end. The jawfish… Continue reading →
Lionfish in the Atlantic are termed invasive species: a non-native organism that has intruded into an area and may have serious detrimental effects on native organisms, the local economy and human health. Continue reading →
My first day on Roatan was January 7th, 2004 after spending nearly three years traveling through Latin America.
It did not take long to get my first certification as a diver after someone told me that I only would know 50% of the island if i didn´t learn to dive.
I got my first and second certification as an exchange for some lamps that I made for a restaurant, then the Rescue came courtesy of my English Instructor and then i was on the verge of becoming a diving professional,the next step Serena and Giacomo (the owner of Pura Vida dive resort) made it possible.
My first job as a Dive Master was with Nuria in Octopus Dive School, and with her financial support i was able to make my Instructor course. Eventually I worked on two other major Dive Centers.
After ten years on the island, nine working as a Dive Instructor and more than 3500 dives, in association with my Open Water Instructor Mal Forrest and his wife Sofia Ocampo have undertaken this beautiful project called “Sun Divers Roatan.”
How we build Sun Divers Roatan, look at the pics.
It looked like another beautiful drift dive at Pablo´s Place, until an unexpected sighting happened… a Hammerhead Shark!!! It was at 40 feet, I came towards me, maybe 20 feet far from where I was, I thought of pulling my camera right away but when I did he turned and left, still I am very pleased, cause is my second time face to face encounter (literally) with this magnificent creature.
Hammerhead sharks are consummate predators that use their oddly shaped heads to improve their ability to find prey. Their wide-set eyes give them a better visual range than most other sharks.
The great hammerhead is the largest of the nine identified species of this shark. It can grow up to 20 feet (6 meters) in length and weigh up to 1,000 pounds (450 kg), although smaller sizes are more common.
Found in temperate and tropical waters worldwide, far offshore and near shorelines, hammerheads are often seen in mass summer migrations seeking cooler water. They are gray-brown to olive-green on top with off-white undersides, and they have heavily serrated, triangular teeth. Their extra-tall, pointed dorsal fins are easily identifiable.
Pablo´s Place 40 feet.
Pablo´s Place 40 feet.
Butcher´s Bank 40 feet.