Blacktip reef shark

Marine sharks and rays ‘use’ urea to delay reproduction

Blacktip reef shark

Blacktip reef shark. Photo by Ray in Manila, Flickr.

Urea – the main component of human urine – plays an important role in the timing of maturation of sharks, rays and other cartilaginous fish.

A new study by researchers with the Sea Around Us initiative at the University of British Columbia’s Institute for the Oceans and Fisheries found that high urea concentrations common in cartilaginous fish, particularly oviparous marine species, allow them to mature and begin to reproduce at a larger fraction of their maximal size.

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Citizen Coalition organized by BLOOM

Over 100 NGOs, citizen groups and top figures launch coalition for ocean protection

Citizen Coalition organized by BLOOM

As the French city of Nice begins preparations to host the high-level 2025 United Nations Conference to Support the Implementation of Sustainable Development Goal 14 (conserve and sustainably use the oceans, seas and marine resources), over 100 non-governmental organizations, academic units, celebrities, and civil society collectives have joined forces to launch the Citizens’ Coalition for the Protection of the Ocean.

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