fast food science

To paranoid, so called friends of the environment: Similar (natural) phenomena involving the same fish species happen almost every summer in this area; seasonally high nutrient loadings and warmth cause the proliferation of algae; these are in turn utilized as a food source by other organisms, which consume the dissolved oxygen. The estuaries and bays of this area are ‘restricted’. This physical condition is extremely important, since on one hand it offers shelter to the juvenile of these fishes but on the other it promote poor ventilation of bottom waters, which easily become completely devoid of oxygen. In addition, the decay of these high quantities of organic matter by bacteria at the seafloor produces hydrogen sulphide, which accumulates in bottoms waters in the absence of currents. This highly toxic substance may eventually return to the surface due to water column mixing, causing the fish kills (Luther et al., 2004 Estuaries). The main culprit is therefore increasing nutrient loadings, which are probably due to a combination of abusive usage of fertilizers and poorly controlled, man-made land use.

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