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Sunday, October 16, 2016
Findings Of The Hawaiʻi Tiger Shark Tracking
There was a spike in the number of shark encounters and shark attacks around the island of Maui in the State of Hawaii during 2012 and 2013.
In an effort to understand tiger shark movements around the islands, researchers from the Hawaiʻi Institute of Marine Biology tagged 41 tiger sharks with satellite and/or acoustic tags off Maui and Oahu. They tracked their movements for up to two years and reported their findings to the scientific community and general public.
The Hawaiʻi Tiger Shark Tracking is an online tracking system that provides a colorful online map that shows the most recent detection of each tagged tiger shark [see here]. Visitors can select a specific shark from the database and see an animated archived tracking of the movement for that particular shark. The sharks are listed by size (e.g., 4.1 meters), gender, and its positioning throughout specific time periods.
The tags were attached to the shark’s dorsal fin and sent a signal to the database every time the shark's fin broke the surface of the ocean. While there is a degree of uncertainty - over a mile in error associated with any given point - the tracking is fascinating.
Very importantly to researchers, open water swimmers and ocean goers, the study revealed the following:
1. Tiger sharks prefer to spend time on insular shelf habitat, the gently-sloping area between the shoreline and the shelf break at a depth of around 600 feet. This type of shelf habitat is home to a wide variety of natural shark food.
2. Despite the routine presence of large tiger sharks close to popular beaches, tiger sharks normally avoid interactions with people.
3. The natural presence of large sharks in Hawaii coastal waters is expected and inevitable.
Photos courtesy of the Shark Research Team of the Hawaiʻi Institute of Marine Biology of the School of Ocean and Earth Science and Technology (SOEST) at the University of Hawaiʻi at Mānoa.
Copyright © 2016 by World Open Water Swimming Association
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Open Water Swimming Magazine
Open Water Swimming MagazineThe Open Water Swimming Magazine is the monthly magazine entirely focused on open water swimming heroes and heroines of every age, ability, and background. Published by the World Open Water Swimming Association, the Open Water Swimming Magazine is a free benefit to WOWSA members.
WOWSA Member Benefits include 12 issues of the Open Water Swimming Magazine, the annual 276-page Open Water Swimming Almanac, a free listing in Sponsor My Swim, outstanding product discounts from FINIS, an entry in Openwaterpedia and more...
The Other Shore
The Other Shore follows world record holder and legendary swimmer Diana Nyad as she comes out of a thirty-year retirement to re-attempt an elusive dream: swimming 103 miles non-stop from Cuba to Florida without the use of a shark cage. Her past and present collide in her obsession with a feat that nobody has ever accomplished. At the edge of The Devil’s Triangle, tropical storms, sharks, venomous jellyfish, and one of the strongest ocean currents in the world, all prove to be life-threatening realities. Timothy Wheeler’s documentary brings Diana Nyad’s extraordinary adventure to life as Diana sets out to prove that will and determination are all you need to make the unimaginable possible.
2014 Open Water Swimming Almanac
An Almanac for Open Water SwimmingAn almanac is essentially a body of knowledge which is so complete that it enables people in different fields to make predictions about the future of their respective industries.
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