title: Haematological and parasitological assessment of silver catfish Rhamdia quelen farmed in Southern Brazil.
abstract: This study evaluated for two years the haematological parameters and the occurrence of gill parasites in silver catfish Rhamdia quelen, farmed in the state of Santa Catarina, southern Brazil. Between March 2010 and January 2012, a total of 137 fish were caught in a fish farm to compare the haematological and parasitological analysis, during hot and cold seasons. Simultaneously, water quality parameters were measured in the pond to analyze the relationship between environmental conditions and haematology and parasitism. During the hot season, there was an increase in water temperature, electrical conductivity and ammonia followed by a decrease in dissolved oxygen, pH, transparency and alkalinity. Two species of Monogenea were observed in the gills, Aphanoblastella mastigatus (Dactylogyridae) and Scleroductus sp. (Gyrodactylidae). Additionally, during this season, there was a significant increase (p<0.05) in the mean intensity of infection by Monogenea, as well as total leukocytes number, thrombocytes and lymphocytes, and a reduction in monocytes. The changes might be caused by parasitism and/or environmental variations between seasons.
authors: AQUOS ? Sanidade de Organismos Aquáticos, Departamento de Aquicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina ? UFSC, Florianópolis, SC, Brasil.
authors: Aline Brum
authors: AB
authors: Figueredo
authors: AQUOS ? Sanidade de Organismos Aquáticos, Departamento de Aquicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina ? UFSC, Florianópolis, SC, Brasil.
authors: Karen Roberta
authors: KR
authors: Tancredo
authors: AQUOS ? Sanidade de Organismos Aquáticos, Departamento de Aquicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina ? UFSC, Florianópolis, SC, Brasil.
authors: Gabriela Sayuri de Oliveira
authors: GS
authors: Hashimoto
authors: AQUOS ? Sanidade de Organismos Aquáticos, Departamento de Aquicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina ? UFSC, Florianópolis, SC, Brasil.
authors: Katina
authors: K
authors: Roumbedakis
authors: AQUOS ? Sanidade de Organismos Aquáticos, Departamento de Aquicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina ? UFSC, Florianópolis, SC, Brasil.
authors: Natália da Costa
authors: Nda C
authors: Marchiori
authors: AQUOS ? Sanidade de Organismos Aquáticos, Departamento de Aquicultura, Centro de Ciências Agrárias, Universidade Federal de Santa Catarina ? UFSC, Florianópolis, SC, Brasil.
authors: Maurício Laterça
authors: ML
authors: Martins
mesh_terms: D000818:Animals; D001938:Brazil; D002397:Catfishes / Q000469:parasitology*; D005393:Fish Diseases / Q000097:blood* / Q000469:parasitology*; D005398:Fisheries; D005880:Gills / Q000469:parasitology*; D006403:Hematologic Tests; D012621:Seasons