Abstract
Toxic pollutants are metabolic poisons that can seriously injure or destroy the photosynthetic organisms upon which the food chain depends. Since microalgae play a key role in marine ecosystems, marine microalgae are proposed as excellent bio-indicators of pollution due to their high sensitivity, which can give warning of the toxic effects of chemicals sooner than any other species. The aim of this work concentrated on the effect of different concentrations of the antifouling biocide (Irgarol 1051) on growth and chlorophylls content (as an essential metabolite) of the two marine unicellular green algae Chlorella salina and Dunaliella bardawil that usually used in fish feeding. The growth of the wall-less Dunaliella bardawil was more sensitive to Irgarol 1051 than the walled cells Chlorella salina, although the concentrations used were greatly different. The product of photosynthesis in the two algal species greatly affected since in the presence of Irgarol 1051, a serious destructive effect was observed. The cell wall appeared to play a significant role in protecting the organism against toxicity of the antifouling agent either by adsorption or degradation. The strength of toxicity depends mainly on the concentration of the antifouling agent, the length of culturing period and the type of organism tested.
Highlights
The aim of this work concentrated on the effect of different concentrations of the antifouling biocide (Irgarol 1051) on growth and chlorophylls content of the two marine unicellular green algae Chlorella salina and Dunaliella bardawil that usually used in fish feeding
The aim of this work concentrated on the effect of different concentrations of the biocide (Irgarol 1051) on growth and chlorophyll content of the two marine unicellular green algae Chlorella salina and Dunaliella bardawil that usually used in fish feeding
Part (I): In this part primarily experiments were done in order to select the suitable concentrations that could be used for growth of the two marine unicellular green algae Chlorella salina and Dunaliella bardawil
Summary
On a very large crude arriver with 40,000 square meter underwater areas, this would add up to 6000 tones of fouling. Just a small amount of fouling can lead to an increase of fuel consumption of up to 40%, and possibly as much as 50%, since the resistance to movement will be increased. The use of coatings containing antifouling compounds on vessel hulls inhibits the settlement of marine organisms [3]. The purpose of using of antifouling coatings is to prevent growth of fouling organisms and to maintain the fractional resistance as low as possible for a maximum period
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