Banca de DEFESA: ÁTILA BEZERRA DE MIRA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ÁTILA BEZERRA DE MIRA
DATE: 31/05/2024
TIME: 09:00
LOCAL: Campus de Rolim de Moura- sala 21
TITLE:

Histopathological lesions of Tambaqui gills (Colossoma macropomum CUVIER, 1819) and the interrelationship with parasites and the environment in anthropzed fish farms in Rondônia 

KEY WORDS:

Aquaculture. Monogenea. Hyperplasia. Inflammation

PAGES: 75
BIG AREA: Outra
AREA: Ciências Ambientais
SUMMARY:

Given the scenario of fish farming in Rondonia and the challenges reported by producers and technicians, as well as the need for a better understanding of the current scenario of aquaculture, this work was structured in two chapters, the first of which dealt with gill parasites in South America in serrasalmids, the family of the main farmed fish produced in Rondônia, Colossoma macropomum, known as tambaqui, as well as gathering information on the tissue damage caused by these parasites. This literature review examined papers published between January 2013 and November 2023 to gather up-to-date knowledge from different multidisciplinary databases, and revealed 83 species from 28 genera, where the main class of parasites identified at the reporting level were those belonging to the class Monogenea, followed by Copepoda, Myxozoa and Trematoda, as well as others with lesser mention. Hemodynamic, degenerative, and adaptive lesions were reported, as well as disorders of Hemodynamic, degenerative and adaptive lesions, growth disorders, inflammatory cell infiltration, and the presence of the parasite itself in histopathologic analyses were reported. Information was also collected on the water quality under the conditions in which these parasites were found, as well as mentioning experimental treatments and discussing their effectiveness and obstacles. This information supported the research carried out in the second chapter, a field study in which tambaquis were evaluated in the two main tambaquis-producing regions of the State of Rondônia: the Vale do Jamari and the Centro-Leste region. A total of 196 animals from 43 farms were evaluated, visited in two different climatic seasons, where water samples were taken to evaluate physical and chemical parameters, and the animals gills were collected and sampled for histopathological analysis. The histopathological analysis showed that all the properties were positive for monogenetic parasites, and the presence of myxosporids and dinoflagellates was also observed in fewer cases. The main changes observed at the microscopic level were growth disorders, the presence of an inflammatory infiltrate and necrosis, which, together with the other changes, caused damage to the respiratory capacity and ionic regulation of the gills. The water quality assessment revealed a weak correlation between the presence of monogeneans and fluctuations in the physical and chemical parameters of the aquatic environment. There was also a statistical increase in the presence of monogeneans and myxosporids in the rainy season, and a statistical interaction between the presence of these two classes, which requires further studies to gain an in-depth understanding of this relationship. In this way, this work has contributed to the identification of one of the health problems in fish produced in the State of Rondônia, has identified previously unreported parasitic interactions, and it is proposed that further studies assess the productive impact in the region, in order to mitigate the problem and boost economic activity.

COMMITTEE MEMBERS:
Presidente - 1846780 - SANDRO DE VARGAS SCHONS
Externa ao Programa - 2035962 - EVELYN RABELO ANDRADE OLIVEIRA - UNIRExterno à Instituição - PAULO HENRIQUE GILIO GASPAROTTO
Externo à Instituição - ED JOHNNY DA ROSA PRADO - UNESP