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Fish farming depends directly on the sea, because the fish live and grow inside it and in the area which the fish farm has at its disposal.
The effect of fish farming on the pollution and the quality of the water, concerns the gradual accumulation on the sea floor of food remains and fish excrement, which result in the increase of the nitrogen and phosphate concentrations.

Despite all this, one should consider that this accumulation is negligible compared to the concentrations caused in the sea by other industrial activities on land.

These units are installed in regions with great depth, strong currents, and this results in the faster dissolution and diffusion of the organic matters that are discharged by the unit, and as a result their accumulation keeps decreasing these past years.