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Eutrophication Indexes Used as Fish Production Parameters in the Itaipu Reservoir (Brazil)

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DOI: 10.4236/jep.2013.47A018    4,621 Downloads   6,968 Views   Citations

ABSTRACT

The knowledge of liminology can be applied in studies of trophic state indexes and morfoedaphic indexes as factors for determining the inference fish production in reservoirs. This work is based on the hypothesis of the trophic cascade relations, particularly related to bottom-up and top-down effect in Itaipu Reservoir (Brazil). Using the data available by Itaipu, from 1999 to 2004, analyzes of multiple regressions were accomplished to determine the relationships of the dependent and independent variables. We applied the trophic state indices (TSI) based on readings Secchi disk, total phosphorus and chlorophyll-a density for obtaining TSI medium. Morfoedaphic index was calculated based on the reading of the concentration of dissolved solids and the inference of fishing yield, from this index. The average results of the trophic state indices indicate an oligotrophic status for the entire reservoir as well as for the riverine, transition and lacustrine zones separately. The fish was yieldn Estimated by the relation with cyanobacteria concentration, and this was the best variable que explained this prediction. The use of the morfoedaphic index (MEI), with the recorded catch data, predictive models can generate que estimate the fishing yield in the Itaipu Reservoir. The relations of MEI with chlorophyll-a and water transparency que Indicate this index may be a good predicting factor for future fish captures.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

R. Filho, J. Pereira, M. Júnior and S. Benassi, "Eutrophication Indexes Used as Fish Production Parameters in the Itaipu Reservoir (Brazil)," Journal of Environmental Protection, Vol. 4 No. 7A, 2013, pp. 151-178. doi: 10.4236/jep.2013.47A018.

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