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About Fishing

Fishing is removing fish from the ocean waters. Fish stocks are continuously being depleted by fishing, while at the same time they are regrowing due to fish reproduction.

Even though Philippino regulations reserve the coastal waters solely for municipal fishers, tuna is a migratory fish that moves between coastal and non-coastal waters. In the model, we make the assumption that municipal fishers1 as well as commercial fishers2 both remove fish from the same fish stock. Overfishing by either group of fishers yields to fish scarcity for both.

The products of fishing differ. Municipal fishers, who catch primarily adult fish, produce sashimi-grade tuna to be sold fresh to consumers. Commercial fishers catch mainly juveniles for the canning and packing industries.

Key Parameters and Observables

Effort and population may both change over time, as governed by the logic of municipal and commercial fishers. Stocks go up or down over time under the combined effect of catch and reproduction. The catchability coefficient remains constant over the years, unless the efficiency of the boats changes. (e.g., With interventions that improve the quality of their fishing gear.)

Move the slider below to increase the efficiency of fishing boats

When fishing effort remains constant, fish stocks stay in equilibrium

When fishing boats become more efficient, catch goes up which reduces the fish stock

With fishing effort and stocks constant, fish catch remains in equilibrium

When fishing boats become more efficient, catch goes up in the beginning, but then falls as a consequence of the impact on fish stocks