That matters because theory suggests that the maximum sustainable yield that can be cropped from a fishery comes when the biomass of a target species is about 50% of its original levels.
The depot of the historic Darsena trams provided a delightful venue for the Tod's show, attended by global brand ambassador Xiao Zhan, who drew the biggest horde of screaming fans despite the pouring rain.
And if we do not make realising the full benefits of being a United Kingdom of four proud nations and one united people our priority now, then in the future it may be too late.