Definitions for "MSY"
MAXIMUM SUSTAINED YIELD. The maximum number of fish from a stock or management unit that can be harvested on a sustained basis, measured as the number of fish that would enter freshwater to spawn in the absence of fishing after accounting for natural mortality.
Maximum Sustainable Yield. (King, 1995). The largest annual catch that may be taken from a stock continuously without affecting the catch of future years; a constant long-term MSY is not a reality in most fisheries, where stock sizes vary with the strength of year classes moving through the fishery.
maximum sustainable yield. The maximum number of a food or game population that can be harvested without harming the population's ability to grow back.