5. Conclusion

The ALPI showed that the Jansen lagoon has a very high degree of deterioration reflecting poor water quality that could endanger the local aquatic biota, with inappropriate conditions for reproduction, stages of development, and the permanence of aquatic organisms, reflecting a framework of environmental degradation of the area.

The use of IMPAC and TSI to obtain the ALPI was an effective tool for the quantification and representation of the degree of deterioration of water quality and, consequently, in the evaluation of the extreme conditions that the aquatic biota that inhabit in the lagoon is subjected to, besides showing the importance of the tides for the underestimation of the detected values for each parameter analyzed, being an important auxiliary element in the self-purification of this environment.
