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In page Carrying capacity:

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Note that mathematically and in practical terms, MSY is problematic. If mistakes are made and even a tiny amount of fish are harvested each year above the MSY, populations dynamics imply that the total population will eventually decrease to zero. The actual carrying capacity of the environment may fluctuate in the real world, which means that practically, MSY may actually vary from year to year[5][6][7] (annual sustainable yields and maximum average yield attempt to take this into account).[citation needed] Other similar concepts are optimum sustainable yield and maximum economic yield; these are both harvest rates below MSY.[8][9]