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Blue shark

It's easy to see where the blue shark got its name from. These sleek, elegant sharks have beautiful metallic blue backs which provide brilliant camouflage out in the open ocean.

Scientific name

Prionace glauca

When to see

June to October

Species information

Statistics

Length: 4m
Globally, the blue shark is listed as Near Threatened on the IUCN Red List. In the UK, it is a Priority Species under the UK Post-2010 Biodiversity Framework.

Habitats

About

The blue shark is an open-ocean (or pelagic) species that visits UK seas in summer months. In the Atlantic, they appear to follow a clockwise route, following the Gulf Stream to the UK from the Caribbean and returning there following the Atlantic North Equatorial Current. Blue sharks are active predators and feed mainly on small fish and squid - though they have been known to take seabirds and other small sharks too. They even feed on fish that live near the seabed and have been recorded at depths of up to 350m. The largest blue shark ever caught in UK seas weighed a whopping 256lbs (116kg) and measured over 9ft (2.74m).

How to identify

A slim torpedo shaped shark with metallic blue colouration on top and white underneath. They have distinctively long pectoral (front) fins.

Distribution

Spotted around the South West coast of England in summer months, normally 10+ miles offshore.

In our area

Blue sharks are mainly an oceanic species but are highly migratory and can be found in Irish waters from July to October time. The arrival of these species sharks is often associated with the sea surface temperature reaching 15oC. As the temperatures rise during the Summer months huge shoals of Mackerel arrive , bringing with them Blue Sharks!

When looking for these beautiful sharks Downings and Port-na-blagh in North Donegal are popular blue shark areas. Harbours throughout Cork, Galway and Clare are also key areas for spotting these sharks.

Did you know?

Blue sharks give birth to live babies! The fertilised eggs remain within the mother's uterus where they are nourished by a yolk-sac. Over time, the depleted yolk-sac interlocks with the lining of the mother's uterus which then acts a bit like a mammal's placenta. Blue sharks give birth to an average of 35 pups.

Blue sharks are mainly an oceanic species but are highly migratory and can be found in Irish waters from July to October time. The arrival of these species sharks is often associated with the sea surface temperature reaching 15oC. As the temperatures rise during the Summer months huge shoals of Mackerel arrive , bringing with them Blue Sharks!

When looking for these beautiful sharks Downings and Port-na-blagh in North Donegal are popular blue shark areas. Harbours throughout Cork, Galway and Clare are also key areas for spotting these sharks.