Question

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Describe the theoretical basis of Maximum Sustainable Yield (MSY) as a fisheries management techniques. As a new fishery is emerging, what management strategy would the MSY concept tell us to initiate? In what ways would catch per unit effort (CPUE) data be useful in determining if our management based on MSY is successful over time? Why has this method often failed to keep fisheries sustainable?

Answer 1

Maximum Sustainable Yield (MSY) as fisheries management techniques.

Maximum Sustainable yield is a fisheries technique wherein when the effort of catching fish increases than catch of the fish will increase to a level that is Maximum sustainable yield after which it will start declining. We get to know about the MSY only when it start decreasing so it also results in overexploitation or at least small loss.

Management strategy

The new strategy would include strictly observing the MSY point through good data feedback system and reducing overexploitation and less effort so money saved can be invested on recreating the machinery to catch fishes.

Catch per unit effort (CPUE) data can be useful in determining if our management based on MSY is successful over time as Catch per unit effort indicates as to whether there is overexploitation or sustainable harvesting taking place. Decreasing line would show its being exploited while if it remains stagnant than it’s a sustainable sign of harvesting fish. While CPUE increase shows that fisheries stock are recovering and effort can be increased accordingly. This surely helps MSY by giving it the insight about how much effort should be put in for best catch.

MSY method often failed to keep fisheries sustainable:

This method has often failed because by the time scientist detects, MSY line has crossed, it usually results in over harvesting of fish or least exploitation at least so it often fails to keep fisheries sustainable.