Marine Biology

Bioeconomic Modelling and Valuation of Exploited Marine by J.C.J.M. van den Bergh, J. Hoekstra, R. Imeson, P.A.L.D.

By J.C.J.M. van den Bergh, J. Hoekstra, R. Imeson, P.A.L.D. Nunes, A.T. de Blaeij

This e-book bargains an environmental-economic research of exploited ecosystems with a transparent coverage orientation. The learn strikes past conventional fiscal fishery research in respects. First, numerous theoretical and numerical versions are provided that mix monetary and ecological descriptions of fisheries. moment, valuation and stakeholder matters are addressed in empirical analyses using either qualitative and quantitative methods. The ways, versions and coverage insights are sufficiently basic and leading edge to curiosity a vast viewers.

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Using these growth equations and finding the bioeconomic equilibrium it turns out that imposing a reserve can lead to a higher equilibrium catch given that the cost of fishing is sufficiently low. Brown and Roughgarden (1997) modeled a fishery where a fish population possessing age-dependent dispersal characteristics is fished under sole-owner conditions. Their model possesses population dynamics aimed at describing a shellfish population in a larvae stage and an adult stage separately. For the adult stage the dynamics of the population is given by: F(X, L) = cL(A − a X ) − μX (35) 42 PART I: TOOLS AND BASIC INSIGHTS where c is the settlement rate of larvae L, A is the amount of space in the habitat under consideration, a is a the amount of space occupied by an adult and μ the mortality rate of the adult population.

As in the single species case, we are not so much interested in the MSY but we are interested in the maximum sustainable profit. This depends on the price of the fish and the effort costs to catch them. We leave the analysis of the discounted maximum profit to Flaaten (1991). But we note that it can be profitable to harvest one species at a loss when the other is much more valuable. The more valuable species is troubled less by its competitor and can be harvested at a much higher stock level. For more discussion of predator-prey models see Chapter 6.

It is easy to show that as price increases to infinity, the sustainable catch supplied will approach zero, meaning it is optimal to completely wipe out the fish population. 4, for the finite and infinite discount case, the optimum catch reaches the MSY point as the price level increases, but then subsequently decreases as the price of fish is further increased. As the price is driven upwards, more fishing will take place and the fish population would sustain itself at a lower population level than the MSY.

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