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Manta Behaviour… where do they go?

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Scuba Tours Worldwide logoThe handsome male manta in the photo above is now known as Troy, thanks to Julia from Wythall, near Birmingham, who won the Scuba Tours Worldwide ‘Name the Manta’ Competition at DIVE 2016 in Birmingham over the past weekend.

“Troy is a fairly large manta who has been visiting Sunlight Thila and Lankan dive sites in the Maldives since mid 2007, but isn’t there often.  He tends to appear when there is a group of large females, so it is likely that he is attracted to these busy cleaning stations during mating season and is looking for a mate,” said Dr Anne-Marie Kitchen-Wheeler from the Manta Ecology Project.

Anne-Marie has been studying mantas for 15 years and she took the above picture whilst working as a Dive Guide in the Maldives for Scuba Tours Worldwide. “I have come to appreciate the range of behaviours exhibited by individual mantas. Some we see many times each season, in some cases we lose contact of one for a few years and then it reappears and is seen frequently for the following seasons. There have been a good number seen once and then not seen again until 10, 12 and even 14 years later … so I never give up on a manta! Where do they go in the meantime? The Maldives is a very large geographical area with many reefs never visited by divers. Even in areas where there is relatively intensive diving there are quiet reefs and channels not ever visited by divers or snorkelers so there are plenty of places for “shy” mantas to avoid human contact. I have certainly observed a range of behaviour as far as manta-to-diver interaction is concerned. All the most famous mantas “love” divers and became famous because they were seen so often, easily photographed and became recognised and their names stuck. When I write “love” divers I mean they are tolerant and curious of us and have probably incorporated swimming through our exhaled bubbles into their cleaning routines.  I really enjoy having a new manta re-sighted several times and become a new favourite … and I hope this is the case with the newly-named “Troy” manta.”

So, if you are going diving in the Maldives, be sure to look out for Troy!

Scuba Tours Worldwide are Maldives Specialists and experts in tailor-made liveaboard and resort holidays. To find out more about the services they offer, visit www.scubascuba.com.

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Heading out on the water this Summer? Watch for manatees

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manatee

As National Safe Boating Week approaches, Save the Manatee® Club is urging boaters, and anyone that enjoys Florida’s waterways, to respect and protect the defenseless manatees that inhabit our shared waterways. From May 18 to 24, leading up to Memorial Day Weekend, the campaign aims to raise awareness about recreational boating safety and the importance of safeguarding imperiled manatees during the summer boating season. This week also emphasizes the importance of encouraging boaters to enroll in a boating safety course.

Manatees are semi-migratory marine mammals that are commonly found in shallow estuaries, bays, rivers, canals, and coastal areas throughout Florida and neighboring states. With some manatees venturing as far west as Texas and as far north as Massachusetts, collisions between these gentle giants and watercraft have become distressingly frequent. Boat propellers and high-speed collisions pose significant threats to manatees, often resulting in severe injuries or even death.

Save the Manatee Club is calling on all water enthusiasts to follow essential manatee safety tips to ensure the well-being of the imperiled manatee:

  • Obey Speed Zone Signs: Familiarize yourself with and adhere to posted speed limits to prevent collisions with manatees.
  • Reduce Glare with Polarized Sunglasses: Wear polarized sunglasses to enhance visibility and spot manatees below the water’s surface.
  • Recognize Manatee Signs: Learn to identify signs of manatees in the area, such as swirls or flat spots on the water caused by their movements.
  • Respect Manatee Sanctuaries: Keep a safe distance from posted manatee sanctuaries and avoid pursuing or harassing these marine mammals, as it is illegal and can disrupt their natural behaviors.
  • Report Distressed Manatees: In Florida, promptly report distressed, injured, tagged, or orphaned manatees to the Florida Fish and Wildlife Conservation Commission (FWC) at 1-888-404-FWCC (3922). Outside of Florida, report sightings to the appropriate state agency or rescue organization. A list of agencies to contact is available at savethemanatee.org/report.
  • Protect Seagrass Beds: Avoid boating over seagrass beds and shallow areas where manatees may be feeding. Stick to deep water channels while remaining vigilant, as manatees also utilize these channels during their travels.
  • Dispose of Fishing Line Responsibly: Anglers should properly dispose of or recycle used fishing line to prevent entanglement hazards for manatees.

“Each year, National Safe Boating Week provides an excellent reminder for all of us to be aware that we share our waterways with vulnerable manatees,” emphasized Patrick Rose, Aquatic Biologist and Executive Director of Save the Manatee Club. “With the recent Unusual Mortality Event on Florida’s East Coast claiming an alarming number of manatees’ lives, it is more crucial than ever to prevent preventable deaths caused by watercraft collisions. By following manatee-safe boating guidelines, such as obeying speed zones and remaining vigilant for manatees, everyone on the water can contribute to the protection of these gentle giants.”

Save the Manatee Club offers a range of free materials to help safeguard manatees and raise awareness about manatee-safe boating practices. Shoreline property owners and park or marina managers can order aluminum dock signs to alert others about the presence of manatees in their areas. Boaters and paddlers can request packets containing a safety tips card, a waterproof boat banner, and a decal to display on their vessels, providing the number to report manatees in distress. To view and request these materials, visit savethemanatee.org/resources. Save the Manatee Club will also be hosting a live webinar for National Safe Boating Week on Tuesday, May 21st at 6pm EST. To register, visit savethemanatee.org/register.

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Marine Life & Conservation Blogs

Book Review: Shells of the World

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Shells of the World: A Natural History by M.G. Harasewych

Shells of the world is a guide to the world of marine, shelled molluscs. And what a varied and interesting world it is. Some of my favourite things to find on a dive are detailed in this book, including disco clams (or Electric File Clams as they are correctly names), the cephalopods, giant clams and sea hares. There are also many on my wish list, top of which is the Nautilus.

Each chapter provides a detailed description of the species, along with beautiful images. You can dive deeper and discover where they live, both with global distribution and the habitat they prefer. Learn about their diet, reproduction and diversity.

Having dipped in and out of this lovely book over the past few weeks, it has inspired me to learn more about this group of animals that we see on most divers, wherever we are in the world. Some of the shells are incredibly intricate and beautiful. I have always agreed with never collecting, or touching, marine life. The description of a certain set of cone shells should be a warning to those that are happy to pick up marine life! One of the cone shells has a local name called the cigarette snail. Why? Because once the venom is in your system from this animal, you only have time to smoke one cigarette before the affects of the venom are fatal!

What the publisher says:

Mollusks are invertebrate animals with a remarkable natural history and a rich fossil record, and their shells are prized for their breathtaking variety and exquisite beauty. Shells of the World provides a wide-ranging look at the incredible diversity of marine mollusks. An informative introduction outlines the lineages covered, followed by a directory section, split into classes, that profiles a broad selection of different taxa to give a sense of their sheer numbers and variety.

  • Features hundreds of beautiful color photos, depicting both the live animals and their shells
  • Discusses mollusk evolution, anatomy, life cycles, behavior, and ecology
  • Describes unique characteristics, distribution, habitat, and size
  • Provides valuable insights into the conservation of the world’s marine mollusks
  • Ideal for malacologists and shell collectors everywhere

About the Author:

M. G. Harasewych is research zoologist emeritus and former curator in the Department of Invertebrate Zoology at the Smithsonian Institution’s National Museum of Natural History. A fellow of the American Association for the Advancement of Science, he is the author (with Fabio Moretzsohn) of The Book of Shells: A Life-Size Guide to Identifying and Classifying Six Hundred Seashells.

Book Details

Publisher: Princeton University Press

Hardcover

Price: £25

ISBN: 9780691248271

Published: 9th April, 2024

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