The sixgill shark (Hexanchus griseus) is the largest of the Hexanchiformes order of sharks, the most primitive living sharks, sometimes called “fossil sharks”. The sixgill, sometimes known as the blunt nose sixgill or cow shark, can grow to over 6 metres (20 feet) in length and weigh over a tonne. What’s interesting is that in Ireland one can catch one of these beasts with rod and line, most famously with the help of master skipper Luke Aston, who is not only a great friend of the podcast but was also our guest in episode 41.

There is very little known about these sharks and what they are doing in (relatively) shallow waters off the coast of Ireland. To explore this subject I was pleased to welcome back to the show Dr Patrick Collins, a marine biologist at Queen’s University Belfast, who was previously our guest in episode 81. During our conversation, we discussed our knowledge and understanding of these species of sharks.

In the second part of the show, we switched to Patrick’s main subject of research: the common skate complex. It was great to hear an update on the progress of research and conservation action since the last time we spoke in late 2020. You are going to hear about some of the findings for the first time here. Unfortunately, the news turns out not to be good.

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