Meanwhile, the first breeding site for critically endangered flapper skate has been found in Orkney.
The skate can grow up to 2.4m (8ft) long and 2m (6ft) wide.
A total of 95 egg cases were found during survey work in Scapa Flow which was commissioned by Orkney Islands Council.
The discovery has led to an exclusion zone in the southern part of Scapa Flow to protect the nursery site.
Daniel Wise, of Orkney Skate Trust, said: “This discovery is fantastic news for Orkney and for flapper skate.
“Locally known as barndoor skate, this fish has a long history in Orkney.”
A flapper skate nursery has previously been found off Skye.