Download The Fish Production Potential of the Baltic Sea: A New by Lars Håkanson, Henrik Ragnarsson Stabo, Andreas C. Bryhn PDF

By Lars Håkanson, Henrik Ragnarsson Stabo, Andreas C. Bryhn

It offers a brand new method of set fish quota according to holistic atmosphere modeling (the CoastWeb-model) and in addition a plan to optimize a sustainable administration of the Baltic Sea together with a cost-benefit research. This plan debts for the creation of prey and predatory fish lower than varied environmental stipulations, specialist fishing, leisure fishing and fish cage farm creation plus an research of linked monetary values. a number of eventualities and remedial concepts for Baltic Sea administration are mentioned and an "optimal" procedure stimulated and provided, which demanding situations the HELCOM method that was once authorised via the Baltic States in November 2007. the tactic encouraged during this booklet may create greater than 7000 new jobs, the entire price of the fish construction will be approximately 930 million euro consistent with 12 months plus a thousand million euro in step with 12 months relating to the willingness-to-pay to wrestle the current stipulations within the Baltic Sea. Our process may rate approximately 370 million euro while the HELCOM approach could price approximately 3100 million euro in line with yr. The "optimal" technique relies on an outlined target - that the water readability within the Gulf of Finland may still go back to what it used to be a hundred years in the past.

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Extra resources for The Fish Production Potential of the Baltic Sea: A New General Approach for Optimizing Fish Quota Including a Holistic Management Plan Based on Ecosystem Modelling

Example text

The model quantifies the fluxes needed to achieve steady-state concentrations for the salinity that correspond as closely as possible to the empirical monthly salinities in the twelve compartments shown in Fig. 10. All equations have been given by Håkanson and Bryhn (2008b) and will not be elaborated here. One can note from Fig. 10 that the greatest water fluxes are the surface-water (SW) fluxes from the Bothnian Sea (BS) to the Baltic Proper (BP; 1,055 km3 /year), the SW-flux from the Gulf of Finland (GF) to BP (940 km3 /year) and the return SW-flow from BP to Kattegat (KA, 885 km3 /year).

Loading of toxins, salt or nutrients, it is imperative to have a dynamic process-based perspective quantifying the factors and functions regulating inflow, outflow and internal transport processes and retention rates. This section has demonstrated that this modeling using the theoretical wave base rather than traditional temperature data to define the surface-water, middle-water and deep-water compartments can give excellent correspondence between empirical and modeled data for the salinity for the Baltic Sea system.

1997) in a study of parts of the Kattegat. 2 Why Not Model N? Savchuk et al. 6). However, Håkanson and Bryhn (2008b) have, based on data from the Baltic Sea and many other coastal areas, demonstrated why remedial actions should not focus on nitrogen and they gave six main reasons: 1. 8). 2. Lowering the N-concentration the Baltic Sea with salinities from 3 to 17 psu is likely to favor the blooming of harmful cyanobacteria, and such events should be avoided. Occasional very high concentrations of cyanobacteria in the Baltic Sea – and elsewhere – may be quantitatively explained by high total phosphorus (TP) concentrations, high temperatures (higher than 15◦ C) and/or low TN:TP ratios (lower than 15 by weight).

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