Basking sharks were heavily fished in the past. Now these gentle and elusive giants are protected in Europe, but we still have a lot to learn about them. Using a collaborative photo-ID database, Cat wants to understand their life history and movements.
My keen interest in nature and the environment developed when I was young, although living in central England, well away from the coast, meant that my curiosity about the underwater world took longer to emerge. It was learning to scuba-dive at the age of 14 that led me to fall in love with the ocean and appreciate its inhabitants. Faced with choosing a career, I jumped at the opportunity to study for a BSc in marine biology and coastal ecology and then an MSc in conservation biology with a view to working in the marine conservation sector. I had a...
The key aim of this project is to build a comprehensive photographic database of basking sharks observed in the UK, while simultaneously using satellite tracking to observe and investigate their migratory movements into international waters.
At up to 10 to 11 metres in length and five to seven tonnes in weight, the basking shark Cetorhinus maximus is the second largest fish in world. However, as a result of fishing pressure, its global existence is now seriously threatened, with the species’ total population thought to have diminished to around only 8,200 individuals.
The basking shark, the world’s second largest shark, is a planktivore – like the whale shark – but confined to temperate waters. It has long been exploited in the Atlantic for its liver oil, and more recently, it has largely disappeared from the Pacific as a result of the Asian demand for shark fin. The work led by Dr Mauvis Gore for the SOSF-funded project has both provided additional insights into this charismatic species and collected data suggesting that following protection in the UK, numbers may be recovering.
The 2009 Basking Shark Conference, which the SOSF sponsored, concluded that the best way to basking shark monitor numbers would be to implement a photo-identification scheme that can generate population estimates through mark-recapture modelling. Consequently in April 2010 a community photo-ID project was launched involving four separate research teams – in Scotland, the Isle of Man, England and Ireland – and a joint database established at the Shark Trust in Plymouth.
Currently work is underway to catalogue the sharks sighted and check for matches with those individuals photographed in previous years. In addition, teams have been collecting tissue samples from which an independent assessment of population structure and size can be derived.
The aims of the project are:
Tanja is learning where the flapper skate moves along the last vestiges of its home range on the Scottish west coast and trying to understand how this affects its genetic diversity. To find out how its declining populations can survive, she is introducing the paternity test to the shark world and exploring whether mating partners, siblings or whole clans are commonly in the same area or if they can be found in different places.
Building a generation of critical thinkers and fostering a sense of connection are what Candice’s work at the Cape Eleuthera Island School in The Bahamas is all about. By challenging children to seek out the answers to their questions themselves and enabling them to visit important marine ecosystems, Candice is encouraging new advocates for the environment and empowering them to make changes in their world.
South Africa is home to an assortment of highly charismatic catshark species, 14 of which occur nowhere else in the world. These greedy little sharks are often caught as by-catch, which makes them very vulnerable. Lisa is enlisting the help of the local diving community to learn more about them and how to protect them.