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Public sightings suggest increase in basking sharks in British waters
Date:7/23/2012

The number of basking sharks recorded in Britain's seas could be increasing, decades after being protected from commercial hunting in the late 20th century. The most comprehensive analysis ever undertaken of basking shark sightings in UK waters, by the University of Exeter, the Marine Conservation Society (MCS), Cornwall Wildlife Trust (CWT) and Wave Action, is published in the journal Marine Ecology Progress Series.

The northeast Atlantic hosted an extensive commercial fishery for basking sharks, mainly in Norway, Ireland and Scotland, where more than 81,000 were killed between 1952 and 2004, hunted largely for their liver oil. Large-scale hunting ended in the UK in the middle of the twentieth century, though it continued at low levels in Norway until 2000.

Protected under UK legislation since 1998 and more recently under international conservation agreements, basking sharks are regularly seen off the coast of the UK during the summer, but very little is known about where and how they live for the rest of the year. The research team set about understanding patterns in summer basking shark sightings in UK waters. They analysed 20-years-worth of data from public sightings - a total of 11,781 records - from databases generated by the Marine Conservation Society and Cornwall Wildlife Trust. They combined these data with records from dedicated boat-based basking shark surveys to complete the largest study of its kind.

Their analysis shows a rise in the number of sightings from the 1980s through to the 2000s. It also suggests an increase in the proportion of medium and large-sized animals, suggesting an increase in the number of older sharks. Basking shark populations are believed to recover slowly from over-exploitation due to their slow growth to maturity and the relatively few offspring they produce in comparison to other fish species. These new results show that long-term protection may well be paying off, with UK basking shar
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Contact: Sarah Hoyle
s.hoyle@exeter.ac.uk
44-013-927-22062
University of Exeter
Source:Eurekalert  

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