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Madagascar emerges as hotspot for endangered whale sharks

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A new study published in the journal Endangered Species Research has revealed that juvenile whale sharks swim to Madagascar, a newly-identified hotspot for these huge fish, to feed. Eighty-five individual sharks were identified in a single season using photographs of their distinctive spot patterns. An isolated ‘island continent’, famed for animals and plants that exist nowhere else in the world, Madagascar’s nutrient-rich waters are also home to an incredible array of marine life attracting increasing numbers of tourists.

Whale shark and fishes – Copyright Simon J Pierce, www.simonjpierce.com

Whale sharks are primarily seen around the small island of Nosy Be, in northwest Madagascar. This area is a globally important hotspot for large marine species, including manta rays, sea turtles, humpback whales and even rare Omura’s whales. The study is part of the Madagascar Whale Shark Project, a collaboration initiated in 2016 by researchers from the Marine Megafauna Foundation, Florida International University, and Mada Megafauna.

Lead author and project leader Stella Diamant said: “We’ve found that whale sharks regularly visit Nosy Be between September and December. That has led to a growing ecotourism industry, as people travel to see and swim with these gigantic, harmless sharks. We’re still learning about their population structure and movement patterns, but it’s clear the area is an important hotspot for the species.”

Whale sharks are the largest fish in the world, growing up to 20 meters long. However, all of the sharks seen in Madagascar have been juveniles of less than nine meters.

We identified 85 individual whale sharks over our first season in 2016. Some of the sharks were present across several months. They spend a lot of time in the area and seem to come here to feed,” Diamant said.

Stella Diamant on boat – Copyright The Madagascar Whale Shark Project

The marine biologists uploaded photographs of the sharks’ unique spot patterns to Wildbook for Whale Sharks (a global database of sightings) and compared them with data collected from known feeding areas in the Indian Ocean, including Djibouti, the Maldives, Mozambique, Seychelles and Tanzania, but found no overlap.

Whale sharks are a globally endangered species due to overfishing, accidental catches and boat strikes. Major declines in sightings have been seen in Mozambique, where we’ve documented a 79% decline in sightings since 2005, and the Seychelles. I was hoping that some of those sharks might have shifted over to Madagascar”, said co-author Dr Simon Pierce, co-founder and principal scientist at the Marine Megafauna Foundation.

Unfortunately, that doesn’t seem to be the case. It’s great news for Madagascar though. These sharks can be a major asset for the country. There’s already a good marine ecotourism industry developing”, he added.

As part of this study, the team attached eight satellite tags to immature whale sharks to track their movements in near real-time. They found that the sharks spent most of their time in shallow waters between 27.5-30°C around the tagging area in Nosy Be.

Stella Diamant with tagged shark – Copyright Simon J Pierce, www.simonjpierce.com

Half of the tagged sharks also visited a second hotspot near Pointe d’Analalava, 180 km south of Nosy Be. Five of the sharks swam over to Mayotte and the Comoros islands, and two swam right down to the southern end of Madagascar. One of those sharks then swam back to Nosy Be, a total track of 4,275 km. The sharks are slow-swimmers, travelling an average 21 km per day. Three sharks were resighted in the Nosy Be area the following season after having lost their tags.

It was exciting to see that there is a second hotspot for the sharks in the area. We will be exploring the area later this year. Madagascar clearly provides an important seasonal habitat for these young whale sharks, so we need to ensure they are effectively protected in the country”, concluded Diamant.

Madagascar is a known location for shark fishing and finning. Whale sharks are currently afforded no formal protection except in two Marine Protected Areas located to the southwest and northeast of Nosy Be.

Over the last decade, shark populations have declined dramatically in Madagascar due to overfishing. However, the most significant threat to this species is the incidental catch in coastal gillnets and industrial purse seiners operating offshore”, said Dr Jeremy J Kiszka, a marine biologist at Florida International University and co-scientific lead of the Madagascar Whale Shark Project.

Whale sharks are listed as ‘endangered’ on the IUCN Red List of Threatened Species since 2016 and received an Appendix I listing the UN Convention on Migratory Species in 2017. As a signatory to the Convention, Madagascar is obligated to protect the sharks and their migratory habitat in national waters.

The study was supported by Les Baleines Rand’eau, Aqua-Firma, PADI Foundation, IDEA WILD, Waterlust, the Shark Foundation, and two private trusts.

Stella Diamant, Christoph A Rohner, Jeremy J Kiszka, et al. ‘Movements and habitat use of satellite-tagged whale sharks off western Madagascar’ was published on 17 May 2018 and is available here.


For more information about Marine Megafauna Foundation please visit:

Website: www.marinemegafauna.org
Facebook: www.facebook.com/MarineMegafauna

Images by www.simonjpierce.com

Marine Life & Conservation

Shark Trust launches Oceanic 31 Shark Art Auction

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After a two-year tour of UK art galleries, community spaces and aquariums, the Shark Trust’s acclaimed Oceanic31 exhibition takes its final bow at the Royal Geographical Society later this month. And the unique collection of artwork, depicting 31 species of oceanic sharks and rays, donated by 31 artists, is now open for bids from art lovers and shark enthusiasts. The online auction, launched today, will close on the 7th December at 8pm (BST). The money raised will support the Shark Trust Oceanics Programme.

People can now bid on 27 of the artworks by visiting this website:

https://superstars-auctions.com/sharktrustauction

It is a chance to own a beautiful piece of original art and to support the Shark Trust. The timing of the auction also means that these would make a very special Christmas gift for any shark-lover.

The diversity of pieces mirrors that of the sharks and rays they represent. You can bid on paintings, digital creations, sculptures, mixed media and more. You can pick your favourite artist or species of shark. Or you can select the perfect artwork to make a statement in your home or office. Whichever you choose, you will be supporting the work to protect these amazing animals.

One of the pieces of art has been selected to be auctioned live by Steve Backshall at the For the Love of Sharks event at the Royal Geographical Society in London on the 29th November. In addition to this, two further pieces will be raffled at this event, giving people a chance to win an incredible piece of shark art. For the Love of Sharks is the Shark Trust’s flagship evening. A night to celebrate sharks. Steve Backshall is the headline speaker at this event that will see other prominent shark advocates join him on stage.

Tickets for the event can be snapped up here:

https://thesharktrust.org.uk/Event/flos24

Those that would like to see the Oceanic 31 exhibition have one final chance. It is being displayed at the Pavilion at the Royal Geographic Society from 26th November until the 7th December. Entry is free.

Find out more here:

https://www.rgs.org/events/upcoming-events/oceanic-31

 Paul Cox, Shark Trust CEO, Said “This exhibition has given us the opportunity to reach out to a new audience. And inspire more people with the wonderful sharks and rays on which our Big Shark Pledge campaign is based. We are immensely grateful to the 31 artists who have worked so hard to create these works.”

Bid for your favourite Oceanic 31 artwork here:
https://superstars-auctions.com/sharktrustauction


Banner Image: Smooth Hammerhead by Alicia Hayden

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Gear News

Introducing the RS Series Drysuit from DYNAMICNORD

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drysuit

Cozy and warm in cold water.

It’s drysuit season all year round. With the new RS series premium drysuits from DYNAMICNORD, divers are perfectly equipped for all cold waters.

The sophisticated cut of the RS drysuits allows complete freedom of movement, providing maximum comfort. The high-quality 350 g/m² ripstop material with double ripstop zones on the elbows, knees, and crotch protect ensures extreme robustness as well as long life.

drysuit drysuit

The suit’s features leave nothing to be desired: A high-quality TiZip zipper, easily adjustable inlet and outlet valves, upgradeable with electrically heated underwear, HP bottleneck cuffs made of high-strength latex on the wrists, a 3mm neoprene neck cuff for maximum comfort, a 7mm hood with air outlet and 3mm boots made of double-sided, cross-layered neoprene with ankle straps and fin strap stoppers and a protective but very flexible sole.

drysuit

Noteworthy is the Molle fastening system, which can be used in a variable and compatible manner. This way, the two detachable leg pockets can be attached easily, safely and comfortably.

Alterations of boots to a different shoe size or adjustments to neck or wrist cuffs are done free of charge at the own DYNAMICNORD service centre in Germany in only a couple of days.

The matching Dynaskins made with high-quality Polartec® technology are available in various designs. As an undersuit under the drysuit, as a single suit in warm waters or as a two-piece suit. Polartec® technology’s main features are neutral buoyancy, breathablilty and quick-drying.

drysuit

Dynaskins are made largely from recycled plastic bottles.

The drysuit RS-351 for men and RS-352 for women are now available at your DYNAMICNORD dealer and in the online store.

Colors men and women: Black-Blue and Black-Burgundy

Sizes men: XS-4XL incl. intermediate sizes MS, MT, MLS, MLT, LS, LT, XLS, XLT, 2XLS, 3XLS, 4XLS

Sizes Women: XS-XL incl. intermediate sizes MS, MT, LS, XLS

DYNAMICNORD – Your Outdoor Companion.

www.dynamicnord.com

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