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Health of fish stocks by fish group

Fish stocks are measured by their biomass: the number of individuals multiplied by their mass.

Here it's measured as the biomass of a fish stock divided by the biomass at its maximum sustainable yield – the level at which we can catch the maximum amount of
fish without a decline in fish populations. A value of one maximises fish catch without decreasing fish populations.

197020161980199020002010This line = Fish stocks are at the maximum sustainable yieldThis line = Fish stocks are at the maximum sustainable yieldTuna