
Deep-sea species tend to be slow growing, late maturing and low in reproductive capacity.
Many deep-water fish species live 30 years or more. Some, such as orange roughy seen here on the processing line of a
factory bottom trawler, can live up to 150 years.

Sponges are some of the oldest multi-cellular animals and have been living in the world’s oceans for over 600 million years. Glass sponges, recently discovered off the coast of British Columbia continue to create towering sponge reefs in a process that has been going on for at least 9000 years. Individual sponges can reach over a metre in height and are thought to be over one hundred years old. Pictured here, sponge ridge at the Davidson Seamount off the coast of California, USA.
Images courtesy of NOAA and MBARI

Because deep-sea species, like this deep water coral, Paragorgia arborea, live in rarely disturbed environments and tend to be slow growing, late maturing and endemic, they are exceptionally vulnerable to extinction.
© Erling Svensen