A United Nations Food and Agricultural Organisation (FAO) committee has ordered the reporting of capture statistics for non-tuna species taken in deep-sea waters off the western coast of Africa.

The FAO is concerned about the growing level of interest in the species such as alfonsino that live off underwater mountains called sea-mounts, and wants to check their exploitation, lest it become unsustainable.

"This should be carefully designed, taking into account the very low level of sustainable yield of these fish populations and the isolation of sea-mount benthic ecosystems," said a resolution of the FAO's fishery committee of the eastern central Atlantic.