Stefano Mariani

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Professor of Marine Biodiversity

I am a marine ecologist and population geneticist, working primarily on fish, though I occasionally venture into the non-scaly world of crustaceans, molluscs and even mammals!

If you wonder what our logo is about, well, she's 'Percie', a mysterious percomorph fish, with a twisted double-helix tail, who's probably leaving some eggs and trace DNA in its wake...


My main research interests include i) the application of population genetics for the identification of management and conservation units; ii) the use of DNA barcoding and metabarcoding to explore and assess biodiversity; iii) the biological and socioeconomic drivers of seafood consumption; iv) the evolution of sex change in fish and its consequences for fisheries.


Our group is based at the Faculty of Science at Liverpool John Moores Universityand we carry out exciting projects on all of the above topics, in every ocean of the world. Please take some time to explore our pages!


For more details on my scientific outputs and regular nerdy updates, check out:





Costa Rica

British students about to fare into the tropical Pacific Ocean...

Kruger National Park

International Barcode of Life Conference 2017


Mauna Kea in the background...

Sampling: hard work

Sustainable lobster in Maine

One of my bonefish from Belize

Glover's Reef, Belize

Italy win the 2011 EMBS trophy

Spinning in Faial, Azores

'Caranx' hooked in Faial!