They have already found the mysterious Buxton Mermaid's hair is human.
The University of Lincoln team is now testing the DNA of the mermaid's tail to see what fish it came from.
Anita Hollinshead, a conservation and restoration masters student, came across the mermaid while working at the Buxton Museum and Art Gallery.
"We think that it came from the mid-19th Century," she said.
"We are still doings tests to find that out.