<strong>Trophic level and bioaccumulation of total phosphorus in cage fish rearing on the aquaculture area at Itaipu reservoir</strong> - DOI: 10.4025/actascibiolsci.v30i3.519

Abstract

The intense production of fishes and the use of water resources can compromise the quality and the availability of water, besides its affects in the environment carrying capacity, causing eutrophization and consequently water pollution. Therefore the objective of this study was to monitor the physical-chemical water variables and to measure the total phosphorus (total-P) in sediment, feed and fish in cage culture on an aquaculture area situated at the Itaipu reservoir in Santa Helena – Parana state, observing the water quality and determining the total eutrophic level on the aquaculture area, in addition to analyze the total-P bioaccumulation in fish and sediment. The physical-chemical water variables presented normal values as indicated from CONAMA. The mean concentration of total-P for the aquaculture area was 28.41 IET and Secchi disc transparency of 2.74 m, giving it an oligotrophic classification. There was a correlation of 0.55 (p<0.01) between this two variables. The bioaccumulation of total-P in sediments decreased from 0.76 to 0.35 g kg-1 during this period. Mean fish accumulation was from 0.30 to 2.82 g kg-1. This activity can be used in the biomanipulation of total-P in similar reservoirs.