In what Australian officials called an outrageous fraud, Japanese fishers probably used a series of disguises for the overcatch and international investigations have found.

The fishers described southern bluefin tuna as a different species and evaded any inspection on shore, underreported the amount of the fish they caught, and imported it as different tuna either transhipped at sea from foreign vessels or in containers. In a review that the Japanese government has vetoed from public release, investigators found the fraud extended to consumer markets.

In her new exhibition, Melt Down - Climate Change In The High Arctic, celebrated photojournalist and Arctic specialist Louise Murray highlights the dramatic melting of the ice sheets in the Arctic through a series of beautiful photographs. We have an exclusive gallery of images from the exhibition below.

Louise is a self-confessed polar nut with 15 years of experience as a professional, she spends much time plotting her next visit to the high north.

It has been widely known that sharks have a special sensory organ on their heads, called the ampullae of Lorenzini, which enable them to detect the very weak electrical fields that prey emit when they swim or bleed.

But now scientists have found that a gel-like substance plays a big role in this process known as electroreception, explaining why sharks pursue bloody victims, even when other easy target´s prey is around, and the gushing blood obscures the shark´s vision and smell.