'Vulnerable' British sharks monitored in Scotland
13 September 2012 Last updated at 08:04 BST
Decades of over-fishing have led to a sharp drop in shark numbers in the UK, according to conservationists.
There are more than 30 types of shark in UK waters. Most are protected by law but a third are still threatened with extinction.
Anglers in Scotland are monitoring six varieties of shark to try to stop their numbers falling.
Jenny Hill reports.