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Deep-sea sharks wired for sound
Date:4/16/2008

a previously blank area of seabed.

A towed underwater camera system was used for fine-scale observations of seabed habitats and communities, fish behaviour and habitat use, and to estimate fish distribution and abundance. In collaboration with the University of Western Australia, baited video cameras were also used to estimate fish abundance.

The sharks were caught and tagged from the South Australian Research and Development Institute (SARDI) Marine Research Vessel Ngerin, with fishing assistance provided by scientists from the Australian Maritime College National Centre for Marine Conservation and Resource Sustainability. Some sharks were released at the surface while others were lowered to the seabed in large cages fitted with video surveillance systems to monitor their recovery.

The sharks will be tracked for the next three years by a network of 24 acoustic listening stations moored 100 metres off the complex and steep seabed. These listening stations were deployed with pinpoint accuracy using the precise positioning capabilities of the Marine National Facility. Four listening stations raised for an early preview have detected a flurry of activity, receiving 5700 acoustic pings in five days from 42 of the sharks moving in all directions.

This large scale experiment, the deepest of its kind in the world, will be important to understand the balance between maintaining fisheries, and protecting the marine ecosystem, Dr Williams says.


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Contact: Bryony Bennett
Bryony.Bennett@csiro.au
61-362-325-261
CSIRO Australia
Source:Eurekalert

Page: 1 2

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