Banca de DEFESA: FLÁVIA LETÍCIA GURJÃO DE ANDRADE

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : FLÁVIA LETÍCIA GURJÃO DE ANDRADE
DATE: 24/08/2024
TIME: 09:00
LOCAL: Plataforma virtual Google meet
TITLE:

Kudoa matosi n. sp. PARASITIZING THE MUSCULATURE OF Cathorops spixii CAPTURED ON THE AMAZON COAST

KEY WORDS:

Myxozoa, Parasite, Colares, Brazil

PAGES: 57
BIG AREA: Ciências Agrárias
AREA: Medicina Veterinária
SUMMARY:

Fish serve as hosts to various parasites, among them, those belonging to the genus Kudoa of the Class Myxozoa (Phylum Cnidaria), parasitize marine and estuarine fish and are rarely found in freshwater. They cause lesions in the skeletal musculature of the host, and after death, they can render the flesh unsuitable for consumption, leading to a phenomenon known as post-mortem myoliquefaction. This effect of muscle lysis occurs through proteases produced by the parasite to favor its development. They are commonly studied for the negative effects the genus has on commercial fishing. The fish Cathorops spixii, commonly known as "uricica," is a catfish of the family Ariidae, of low commercial value but widely consumed by the riparian population. The present study identified the presence of a microparasitic myxozoan infecting specimens of Cathorops spixii collected on the beach of Humaitá, in the municipality of Colares/PA, from January to March 2023. The methodology included necropsies on 30 individuals to detect microparasites, and when myxozoan material was identified, it was collected for analysis through light microscopy and molecular biology. Cysts were macroscopically observed in some of the animals examined. During necropsy, spores morphologically resembling to Kudoa sp., were identified in the skeletal musculature of the fish, and histopathological analysis revealed significant alterations in the host's muscle tissue. Molecular biology analyses yielded results with a partial sequence of 971 base pairs of SSU rDNA gene, which were sequenced and compared with reference sequences in GenBank. The collections were approved by the Animal Use Committee of the Federal Rural University of the Amazon with registration in the Authorization and Information System on Biodiversity. This study aims to characterize and identify the microparasites present in Cathorops spixii. The analyses indicated the possible existence of a new species of the genus Kudoa, standing out for distinct characteristics from other Myxozoa, and emphasize the importance of this parasite in causing damage to the musculature of the species Cathorops spixii, which plays a relevant role in the teleost fauna in the Amazon.

COMMITTEE MEMBERS:
Externo ao Programa - 1273038 - DIEHGO TULOZA DA SILVA - nullPresidente - 1557097 - IGOR GUERREIRO HAMOY
Externo à Instituição - MARCELO FRANCISCO DA SILVA
Externo à Instituição - SAVIO LUCAS DE MATOS GUERREIRO