LINCOLN Corrêa | Universidade Federal do Oeste do Pará (original) (raw)

Papers by LINCOLN Corrêa

This paper records the first occurrence of Epistylis sp. on the body surface of Argulus sp. paras... more This paper records the first occurrence of Epistylis sp. on the body surface of Argulus sp. parasi-tizing Hoplias aimara from the upper Araguari River, in the eastern Amazon region, in the north of Brazil. Of the 16 specimens of H. aimara examined, 93.7% had their pelvic, caudal and pectoral fins and tegument infested by Argulus sp. (n = 73), which in turn were infested by Epistylis sp. The specimens of Epistylis sp. from the body surface of Argulus sp. were analyzed using Scanning Electron Microscopy (SEM). The present study also identified a widening of the geographic distribution of these two species of ectoparasites to the eastern Amazon region of Brazil.

Hematology is an important pathological and diagnostic tool. This paper describes the hematologic... more Hematology is an important pathological and diagnostic tool. This paper describes the hematological parameters of 76 specimens of Hoplias malabaricus infested with monogenean parasites, which were collected from two lagoons. The hematological parameters included: erythrocyte count (Er), microhematocrit (Hct), hemoglobin (Hb), mean corpuscular volume (MCV), mean corpuscular hemoglobin (MCH) and mean corpuscular hemoglobin concentration (MCHC). The blood parameters showed no significant changes associated with the infestation. Water temperature was found to be negatively correlated with MCV and Hct, with values of r s = –0.52, p<0.0001 and r s = –0.48, p<0.0001, respectively. The mean Relative Condition Factor was Kn=1.01, indicating good health conditions of the fish in these lagoons. No correlation was found between the monogenean infestation and the blood parameters, or between the environmental factors and the monogeneans. Resumo A hematologia é uma importante ferramenta para patologia e diagnóstico. O presente estudo teve como objetivo descrever os parâmetros hematológicos de 76 espécimes de Hoplias malabaricus, coletados em duas lagoas, associados ao parasitismo por monogenético. Os parâmetros hematológicos foram: contagem de eritrócitos (Er), micro hematócrito (Hct), hemoglobina (Hb), volume corpuscular médio (VCM), hemoglobina corpuscular (HCM) e a concentração da hemoglobina cospuscular média (CHCM). Observou-se que não ocorreram mudanças significativas nos parâmetros sanguíneos relacionados com o parasitismo. Houve uma correlação negativa entre a temperatura da água o VCM e Hct, com valores de r s = –0,52, p<0,0001 e r s = –0,48, p<0,0001, respectivamente. O valor médio entre o fator de condição relativo foi de Kn = 1,01, indicando boas condições e os peixes estavam saudáveis nas lagoas estudadas. Não houve relação entre a infestação de monogeneas e os parâmetros sanguíneos, ou entre os fatores ambientais e as monogeneas. Palavras-chave: Parasitas, células sanguíneas, peixes de água doce.

This study describes the hematological alterations in Astyanax altiparanae associated with infest... more This study describes the hematological alterations in Astyanax altiparanae associated with infestation with Lernaea cyprinacea. The study was carried out in a lagoon of the Mogi-Guaçu River, in the municipality of Pirassununga, in the state of São Paulo, Brazil. Of 46 fish examined, 45.6% had their integument infested by L. cyprinacea, with a mean intensity of 4.9 parasites per fish and a mean abundance of 2.2, giving a total of 139 recovered crustaceans. The abundance of L. cyprinacea correlated positively with the length and weight of the hosts, and the intensity of infestation was higher in female hosts. Macroscopic observation of lesions associated with the parasite showed a severe inflammatory reaction around the site of attachment of L. cyprinacea, associated with a lower relative condition factor and blood parameters. The hematocrit, number of red blood cells and thrombocytes were higher in non-parasitized than in parasitized fish. However, the hemoglobin concentration, hematimetric indices and the number of white blood cells were not influenced by infestation.

The objective of the present study was to discover the hematological indices of Hoplias malabaric... more The objective of the present study was to discover the hematological indices of Hoplias malabaricus infected by larvae of Contracaecum sp. A total of 105 fish were collected from two lakes located in the municipal district of Pirassununga, São Paulo, Brazil, of which 95.2 % were infested by L 3 larvae of Contracaecum sp., with an average intensity of 348.7±231.55 helminths/fish. A total of 76 fish were analyzed to establish hematological parameters. Following analysis, it was found that there was a significant difference between hematological parameters Hct, erythrocytes (Er), thrombocytopenia (p=0.01), and Hb (p=0.02) in lakes A and B, while there was no significant difference for leukocyte (p=0.68), mean corpuscular volume, mean corpuscular hemoglobin (p=0.06), and mean corpuscular hemoglobin concentration (p=0.47). The intensity of infection correlated negatively with Er (r s =−0.42; p<0.01) and positively for (r s =0.48; p<0.01). The high intensity of infection by Contracaecum sp. in H. malabaricus did not affect the health of the fish despite causing alterations in hematological variables.

Traira (Hoplias malabaricus) is a neotropical fish that is widely distributed in freshwater envir... more Traira (Hoplias malabaricus) is a neotropical fish that is widely distributed in freshwater environments in South America. In the present study, we documented the occurrence of metacercariae of Austrodiplostomum spp. (Diplostomidae) in the eyes and cranial cavity of H. malabaricus and described parasite-induced behavioral changes in the host. The fish were collected from the upper São Francisco River, in the Serra da Canastra mountain range, Minas Gerais, transported alive to the laboratory, observed for 2 weeks, and subsequently examined for parasites. Of the 35 fish examined, 28 (80 %) had free metacercariae in the vitreous humor (mean intensity=95.4; mean abundance = 76.3), and 24 (68.57 %) had free metacercariae in the cranial cavity, mainly concentrated below the floor of the brain, at the height of the ophthalmic lobe (mean intensity=12.91; mean abundance=8.85). Specimens of H. malabaricus with a high intensity of infection in the brain displayed changes in swimming behavior.

The present study investigated the fauna of metazoan parasites of a Geopha-gus proximus populatio... more The present study investigated the fauna of metazoan parasites of a Geopha-gus proximus population from the lower Tapajós River, in the state of Pará, northern Brazil. A total of 137 monogeneans were collected from the gills of G. proximus, including Sciadicleithrum kritskyi, Sciadicleithrum paranaensis and Sciadicleithrum geophagi, while 119 Raphidascaris (Sprentascaris) lanfre-diae nematodes and 28 metacercariaes of digenea undetermined were collected from the intestine. Hosts harboring four species of parasites were predominant. The parasites had an aggregated dispersion pattern. The present study represents the first record of S. geophagi parasitizing G. proximus, increasing the geographic distribution of these parasite species to the Tapajós River basin.

The Brazilian Amazon has been an area of concern since the beginning of the development of modern... more The Brazilian Amazon has been an area of concern since the beginning of the development of modern public health in Brazil. The parasitic diseases of populations of the Amazon region are one of the parameters used to determine the extent of the total area of the aquatic environments (rivers, lakes, floodplains) of the Brazilian Amazon, which cover 300,000 km 2. The aquatic environment is important for health due to the infectious processes that rely on water transport [1]. The interactions between the atmosphere and the forest, which have a significant role in the production of rainfall in the region, are of great importance [2]. The Amazonian winter is an important regulating factor of biological processes, especially those related to infectious diseases. Rainfall predominates in this period and the volumes of rivers and floods in some cities and towns in the region increase, leading to the occurrence of parasitic diseases which can be classified into categories relating to the environment in which they are transmitted, such as those related to water, excreta (sewage), garbage and housing. Of the numerous Amazonian parasitic diseases, notable illnesses of the Amazonian winter include: Amebiasis, Giardiasis, Ascariasis, Schistosomiasis, Dengue, Chikungunya, Zika and Malaria. Another parasitic disease that is becoming frequent in Brazilian Amazonian communities are cases of Serpiginous Dermatitis and Pruriginous Dermatitis, where the main etiological agents are Ancylostoma braziliense and Ancylostoma caninum, parasites of the small intestine of dogs and cats, animals that live by the riverside and whose feces enter the perimeters of housing areas with the increase in water levels. The constitutional mandate guides the creation of public sanitation and sewage policies in Brazil. Articles 23, 196 and 225 of the Federal Constitution contain provisions that deal with sanitation, health services and environmental protection, while Articles 21, 25, 30 and 182 govern the competences of the federal entities (the Union, the states, the Distrito Federal (Federal District) and the municipal regions). This is explained by the federative pact, and the guarantee of the relative autonomy of the administrative spheres, although it is necessary to resort to infra-constitutional norms in order to develop policies. Complying with the Law of Basic Sanitation while taking into account the local realities of most municipal regions reveals the great difficulties involved in achieving the objective of legislation. The situation is made worse by the requirement that the application of resources in sanitation and sewage systems should be preceded by planning at the municipal, state and federal levels. According to Decree No. 8,629 dated 12/30/2015, from December 2017 the release of the budgetary resources of the Union for sanitation and sewage works depends on the existence of a Basic Municipal Sanitation Plan, while the same legislation ties the validity of sanitation and sewage service contracts to the existence of municipal sanitation and sewage plans, considerably affecting the Brazilian Amazon. In the North region of Brazil, only 16.42% of sewage is treated, and the total coverage level is 8.66%, the worst index among all regions in Brazil [3]. Of the nine states that make up the Legal Amazon, six are in the North region (Acre, Amazonas, Amapá, Pará, Roraima and Rondônia). The state capitals have already established their sanitation plans, and occupy low positions in the Sanitation Ranking–The 100 Largest Cities in Brazil (SNIS 2015) [4]. The other municipal regions are also lacking, contributing to the spread of parasitic diseases related to the absence of basic sanitation. Parasitic diseases are closely associated with environmental dynamics such as the Amazonian winter and the sanitation and sewage conditions of cities. As a result, each city in the Amazon region has peculiarities that differ from the classic endemic regions. Although our current understanding of the life cycle of parasitic diseases has expanded in terms of diagnostic and therapeutic purposes, prevention remains a challenge. Sanitary and sewage conditions are a determinant for understanding the dynamics of parasitic diseases and their environmental context. Basic sanitation has a direct impact on parasitic diseases. The diagnostic strategies aimed at identification and treatment are deficient in terms of reporting, however, and there is a clear need for improvements in the information networks involving Amazonian parasitic diseases, so that these illnesses can be mitigated and no longer be considered neglected tropical diseases.

The aim of this study was to investigate parasites crustacean fauna in Arapaima gigas, Cichla mon... more The aim of this study was to investigate parasites crustacean fauna in Arapaima gigas, Cichla monoculus, Potamotrygon motoro of the State Amapá and Pará, in northern Brazil. A total of 242 parasites, including Argulus elongatus, Argulus multicolor, Argulus juparanaensis, Argulus nattereri, Dolops discoidalis, Dolops longicauda, Braga patagonica, Braga fluviatilis, Livoneca guianensis and undetermined Lernaeidae, were collected from these hosts. The Argulus species had the greatest richness among the community of parasitic crustaceans. There was a low abundance of parasites among the hosts, other than D. discoidalis, was most abundant in the integument of A. gigas and P. tigrinum. Finally, the present study reported nine new hosts for the crustacean parasite species and expanded knowledge of the occurrence of some parasite species in the Jari River basin, in eastern Amazon.