Banca de DEFESA: THATIANA LUIZA ASSIS DE BRITO CARVALHO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : THATIANA LUIZA ASSIS DE BRITO CARVALHO
DATE: 23/12/2022
TIME: 09:00
LOCAL: on-line
TITLE:

Use of fish as bioindicators of environmental impacts in the Bays of Paraty and Sepetiba, RJ: Histological biomarkers

KEY WORDS:

gills, hepatopancreas, kidney, histology, bioindicator, cyanides

PAGES: 112
BIG AREA: Ciências Biológicas
AREA: Zoologia
SUBÁREA: Zoologia Aplicada
SUMMARY:

Sepetiba Bay has been suffering heavily from anthropogenic activities, while Paraty
Bay even with the presence of contamination sources does not seem to suffer major
environmental effects. The use of bioindicators can be considered an important tool for
environmental monitoring in aquatic ecosystems, in which the use of fish is efficient.
Histology is considered a biomarker and can be used as an effective instrument to
analyze the effects of pollutants and other stressors on fish. The gills, hepatopancreas
and kidneys are target organs for the action of pollutants in the aquatic environment and
can manifest at various levels of biological organization, including structural changes.
In this sense, histological changes were analyzed in the gills, kidneys and
hepatopancreas, in order to evaluate the use of the fish Menticirrhus americanus
(Linnaeus, 1758) and Micropogonias furnieri (Desmarest, 1823) as bioindicators of the
environmental quality of the Bays of Paraty and Sepetiba, located in the state of Rio de
Janeiro. For the accomplishment of the present study a total of 75 fishes were collected
from the Bays of Paraty and Sepetiba. In the species collected in the Bay of Paraty the
lesions commonly found were leukocyte infiltration, vasodilation and lamellar blood
congestion in gills; cellular hypertrophy, dilation of the tubular lumen, and tubular
regeneration in kidney; nuclear hypertrophy, irregular shaped nucleus, nuclear
lateralization in hepatopancreas. Stage III changes are the most important because they
are irreversible. In addition, the gills were considered the most appropriate organ for
analysis of environmental impacts, considering that the percentages of the lesions
analyzed indicate that the gill tissue suffered the highest occurrence of histological
alterations of stage III in Sepetiba Bay. Therefore, the percentages of the same stage
changes found in the hepatopancreas and kidneys, are inferior when compared to those
of the gills. Thus, histological biomarkers can be used as a low cost tool as a
bioindicator of the environmental impacts by determining the health of Menticirrhus
americanus and Micropogonias furnieri, from the family of the cyanides.

COMMITTEE MEMBERS:
Interna - 3377607 - APARECIDA ALVES DO NASCIMENTO
Externa ao Programa - 2142679 - LEILANE MARIA BARCELLOS NEPOMUCENO - UFRRJExterno ao Programa - 387081 - MARCOS ANTONIO JOSE DOS SANTOS - UFRRJExterna ao Programa - 2606155 - VIVIAN DE ASSUNCAO NOGUEIRA CARVALHO - UFRRJExterna à Instituição - CLARICE MACHADO DOS SANTOS - UFF
Externo à Instituição - ANA LUIZA BASTOS - UFF
Externa à Instituição - BERNADETE MARIA DE SOUSA - UFJF