SCUBA News 196
28 September 2016
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Hundreds of miles from the Indian mainland, the Lakshadweep and Andaman Islands are renowned for beautiful diving.
When, where and why to go diving in Antigua
More divers' votes means that our list of the World's best dive sites has changed again
Unknown Diving Certificate
I have diver that showed me a card for Open Water from N.P.O master scuba instructors association from Japan from a CI International. Anybody know this certification?
Have you any info for Nicolas? E-mail [email protected] and we'll pass your comments on.
The Bull Shark (Carcharhinus leucas) is our Creature of the Month
One of the extraordinary things about Bull Sharks is that they are as happy in freshwater as they are in the sea. They have even been see far inland up the Mississippi river. Many spend time in the freshwater Lake Nicaragua - jumping up the river like salmon to get there.
Bull sharks are medium-sized sharks with thick-set bodies. They are requiem sharks, related to tiger sharks and oceanic whitetips. Like these they are aggressive hunters. They eat all sorts of animals, including turtles, birds, dolphins, terrestrial mammals, crustaceans, fishes and other sharks. The young bull sharks live in inshore estuaries whereas adults are highly dependent on coral reef communities for their food.
Bull shark by Pterantula CC BY 2.5
Bull sharks cruise the seas alone until it's time to mate. The mothers are viviparous - they give birth to living babies rather than to eggs. Their litters contain between one and fourteen pups. A single litter of pups can come from two fathers! Scientists think that the female sharks mate several times with different males to increase either the number, or the quality, of their babies.
The IUCN assess the bulls shark as "near threatened". This means likely to become endangered in the near future if trends continue. The location of nursery areas in estuarine and freshwater systems makes the species vulnerable to pollution and habitat modification. Other threats include recreational fishing and by-catch in commercial fisheries.
First Evidence of Multiple Paternity in Bull Sharks, SCUBA News, 9 November 2015
Simpfendorfer, C. and Burgess, G.H. 2009. Carcharhinus leucas. The IUCN Red List of Threatened Species 2009: e.T39372A10187195.http://dx.doi.org/. Downloaded on 22 September 2016.
Evidence of Partial Migration in a Large Coastal Predator: Opportunistic Foraging and Reproduction as Key Drivers? Mario Espinoza , Michelle R. Heupel, Andrew J. Tobin, Colin A. Simpfendorfer, February 3, 2016 http://dx.doi.org/10.1371. Downloaded on 22 September 2016.
Join the Red Sea Aggressor liveaboard in December to dive the world class Brothers islands, Daedalus and Elphinstone reefs. Transfer from Marsa Alam or Hurghada. Book now and save 50%!
Ocean Art Underwater Photography Contest 2016 Now Open
Sharm el-Sheikh flights to resume soon?
Fishing ban in four new marine reserves
Human activity means sharks are disappearing from the North Sea
Sharks smarter than we think
Melting Sea Ice Boosts Food Availability for Bowhead Whales
Endangered dolphin with broken blowhole learns to mouth-breathe
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