Banca de QUALIFICAÇÃO: CELSO LUIS CRUCES CHANCAHUAÑA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : CELSO LUIS CRUCES CHANCAHUAÑA
DATE: 31/01/2024
TIME: 09:30
LOCAL: on-line
TITLE:

Taxonomy and phylogeny of dactylogyrids (Platyhelminthes: Monogenea: Dactylogyridae) parasites of marine fish in the northern region of Peru

KEY WORDS:

Monogeneans, Dactylogyridae, Phylogeny, 28S rDNA, Marine fish, Taxonomy

PAGES: 78
BIG AREA: Ciências Biológicas
AREA: Zoologia
SUBÁREA: Zoologia Aplicada
SUMMARY:

The monogeneans are parasites that are part of the class Monogenea Van Beneden, 1858, belonging to the phylum Platyhelminthes Minot, 1876, and are characterized by the presence of a posterior attachment organ called the haptor (THATCHER, 2006; BOEGER and KRITSKY, 2001; PAVENELLI et al., 2002). They are typically small, flattened organisms that infect marine and freshwater fish (BOEGER and KRITSKY, 2001), as well as other aquatic animals (DU PREEZ et al., 2002; PAVENELLI et al., 2008). These parasites have a direct life cycle, meaning they go through a single host during their life cycle (PAVENELLI et al., 2013). Adult forms of monogeneans usually live on the gills, skin, or fins of fish, where they attach and feed on bodily fluids (EIRAS et al., 2010). Some species can infect the internal organs, cloaca, or urinary bladder of amphibians and aquatic reptiles or the ocular cavity of hippos. The life cycle of monogeneans typically includes egg, larval (oncomiracidium), and adult stages (BUCHMANN and LINDESSTROM, 2002). After hatching, larvae actively seek a suitable host to attach to. Once attached to the host, they mature and reproduce, producing new eggs to continue the cycle (ROUMBEDAKIS et al., 2018).

The study of the taxonomy of monogeneans is crucial for several reasons. Firstly, taxonomy allows proper identification and classification of these parasites based on morphological and molecular characteristics. This is essential for understanding the diversity, distribution, and evolution of these organisms, as well as aiding in the investigation of their relationships with hosts. Within monogeneans, Dactylogyridae is a significant family, comprising a wide variety of species (CRIBB et al., 2002). These parasites are found on the gills and skin of both freshwater and saltwater fish. Their ability to attach to the gills can cause serious harm to hosts, interfering with breathing, proper gill function, and consequently affecting the physiological performance of the fish (BAKKE et al., 2007; ANTONELLI et al., 2010). In severe infestations, it can lead to the death of host fish, especially in young populations or under environmental stress conditions. Additionally, Dactylogyridae infestation can weaken fish, making them more susceptible to other diseases and negatively impacting aquaculture production (BUCHMANN and LINDENSTRØM, 2002; THATCHER, 2006). Therefore, understanding the taxonomy of these parasites is crucial for implementing appropriate control and management measures, including the development of prevention and treatment strategies to reduce the negative impact they may have on fish and the aquaculture industry (MENDOZA-FRANCO 2009).

The aim of this thesis is to gain a better understanding of the biodiversity of dactylogyrid monogeneans, parasites of marine fish in the northern region of Peru, by conducting a taxonomic and phylogenetic study of them. This will provide information that can, in the future, serve as a basis for biotic integrity studies in the regions.

COMMITTEE MEMBERS:
Externo à Instituição - FABIANO PASCHOAL DE OLIVEIRA - UFRRJ
Presidente - 387200 - FRANCISCO GERSON ARAUJO
Interno - 2242796 - JOSE LUIS FERNANDO LUQUE ALEJOS
Externa à Instituição - RAQUEL DE OLIVEIRA SIMOES