SCUBA News 230
27 July 2019
SCUBA News (ISSN 1476-8011)
Issue 230 - August 2019
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Remote; very remote. Home of the wrecks of Bikini Atoll including the Saratoga - voted one of the best wreck dives in the world. Also fabulous walls and reefs, and part of the biggest shark sanctuary in the world.
There is some incredible diving in Mozambique. The Bazaruto archipelago has been a protected area since 1971. Here you can find dugongs, dolphins, whales and turtles. In Tofo, Inhambane you can see whale sharks and manta rays. Nacala to the north of Mozambique is a beautiful area with a great diversity of sealife and the Quirimbas National Park lies along the north east of the country.
San Andres, Colombia
I just came back from a week on San Andres island staying at the camera and resorts. San Andres has some of the best diving I have done around the world - the Decamaron has multiple dive shops and very well educated and trained crews. There are many great dive sites from beginning open water diving all the way up to advanced and technical dives. I will definitely be returning.
More on diving San Andres
Cave Diving Course, Mexico
I did a cave diving course (cavern to full cave) plus sidemount training with Eric who owns Beyond Diving and this was the best, yet hardest course I have ever taken. Extremely rewarding and I feel super proud to have done this course. I don't think I could have picked a better instructor to do my training with. While the courses are not cheap, they shouldn't be. I think I got exactly what I paid for, if not more.
Tom Janesky, USA
More on diving Mexico's Cenotes
Featured Liveaboard - The Phinisi
Save 20% on Diving Thailand on the classic Phinisi schooner
Special offers in November and December - a good time to dive Thailand's best sites.
Young Golden Trevally are strikingly coloured, their gold and black striped garb showing from where their name comes. These young fish like to seek out large animals like sharks, groupers and dugongs for protection, acting as pilot fish. Sometimes they make a mistake and decide that a diver is the perfect companion. They will hover close to the tank for the entirety of a dive and until the diver finally has to say goodbye and emerge from the water, leaving the fish to swim quickly back to the relative safety of the reef to wait for another passing prospect.
Juvenile Golden Trevally with Diver. Photo credit Jill Studholme.
Some young trevally prefer to live as symbionts among the tentacles of jellyfish. When not following larger animals, or living in a jellyfish, the fish shoal together.
Juvenile Golden Trevally. Photo credit Jill Studholme.
Golden Trevally live throughout the Indo-Pacific from the Red Sea to Baja California and South Africa. When mature they grow as long as 120 cm. You see them in deep lagoons and seaward reefs. They root about in the sand for invertebrates and fishes, the mouth forming a tube to suck up their food.
Adult Golden Trevally. Photo credit Kare Kare (CC BY 3.0).
Their scientific name, Gnathanodon speciosus, comes from the Greek - Gnathos which means jaw and odous which means teeth. Actually, the adults have no teeth at all. Speciosus is from the Latin meaning showy. This species is the only one in the Gnathanodon genus. The Golden Trevally has many other common names, including Golden pilot jack.
Shoal of sub-adult Golden Trevally. Photo credit Laszlo Ilyes (CC BY 2.0).
The Trevally family (Carangidae) contains around 140 species. Many have a metallic sheen on their skin, caused by numerous mirror-like platelets of guanine crystals which reflect light. Normally trevally hunt in schools, circling smaller fish and gradually tightening the circle - catching any fish that tries to escape. Our adult Golden Trevally snuffling about in the sand is an exception.
Juvenile Golden Trevally with Dugong. Photo credit Suzanne Challoner.
Class: Actinopterygii > Order: Perciformes > Family: Carangidae > Genus: Gnathanodon > Speicies: Gnathanodon speciosus
References and Further Reading:Coral Reef Guide Red Sea Reef, Ewald Lieske and Robert Myers
Red Sea Reef Guide, Helmut Debelius
Male-to-female sex change happens first in the brain, in clownfish at least
Blue sharks use eddies for fast track to food
Industrial fishing behind plummeting shark numbers
Where did all the cod go? Fishing crisis in the North Sea
Researchers find depleted seamounts near Hawaii recovering after decades of federal protection
Japanese Whaling Is Not the Greatest Threat to Whale Conservation
Whales older than Moby Dick
SCUBA News is licensed under a Creative Commons Attribution 4.0 Unported License. This means we are happy for you to reuse our material for both commercial and non-commercial use as long as you: credit the name of the author, link back to the SCUBA Travel website and say if you have made any changes. Some of the photos though, might be copyright the photographer. If in doubt please get in touch.
Photo credits: Tim Nicholson, Jill Studholme, Kare Kare, Laszlo Ilyes, Suzanne Challoner
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