Abstract:
The present study compared the haematological characteristics of Nile tilapia and carp parasitized and non-parasitized captured in fish farms from the cities of Blumenau, Joinville and Ituporanga, SC, South Brazil. In Blumenau the animals were fed not only with dry ration, but also with fish entrails and restaurant scraps, while Ituporanga consorted system with pig manure was common. From 146 examined tilapia, 79% were parasitized: 81% with Trichodinamagna and Trichodina truncata (Protozoa: Ciliophora); 76% with Cichlydogyrus sp., Cichlydogyrus sclerosus (Monogenoidea: Dactylogyridae) and Gyrodactylus sp. (Gyrodactylidae); 9% with Lamproglena sp. (Crustacea: Lernaeidae) and 15% with crustacean copepodids. From 20 examined carp, 55% were parasitized: 18% with Trichodina spp., 90% with Dactylogyrus sp. (Dactylogyridae) and 36% with crustacean copepodids. The total mean of hematocrit percentage, number of thrombocytes and erythrocytes, as well as the number of neutrophils and monocytes was not related to parasitism. Parasitized tilapia from Blumenau and Joinville showed reduced number of erythrocytes, thrombocytes, leucocytes and circulating lymphocytes. Parasitized carp showed reduced hematocrit and increased erythrocyte number. Possibly, the handling and the source of feeding affected the haematological response of tilapia from Blumenau.
Luciana Ghiraldelli , Mauricio Laterca Martins , Marcela Maia Yamashita and Gabriela Tomas Jeronimo , 2006. Ectoparasites Influence on the Haematological Parameters of Nile Tilapia and Carp Cultured in the State of Santa Catarina, South Brazil. Journal of Fisheries and Aquatic Science, 1: 270-276.
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