Can the parasitic fauna on Nile tilapias be affected by different production systems?

Abstract

This study compared the parasitic fauna on Nile tilapias kept with swine dejects and tilapia from fee fishing fed commercial ration. A total of 360 fish were analyzed from August 2003 to July 2004 in a facility situated in Nova Trento, Santa Catarina, Brazil. No significant difference was observed in both systems. The parasite fauna in both systems were slightly similar, with the presence of the following parasites: Trichodina magna and T. compacta (Ciliophora); Cichlidogyrus sclerosus and Cichlidogyrus sp. (Monogenoidea); and Lamproglena sp. (Lernaeidae). Parasitological analyzes did not differ among fishes kept with swine dejects and in fee fishing with commercial diet (P>0.05). The total prevalence of trichodinids in the gills of fish kept with swine dejects was 1.7% as compared to the one kept in fee fishing with commercial diet (0.6%). The Monogenoidea prevalence and mean intensity in the gills and body of fish from fee fishing was 16.5% and 2.6, and compared to other system was 13.2% and 0.8, respectively. This study showed that low stocking density and low water temperature in that region were responsible for the maintenance of good health and lower parasitism rate.

Parasitic fauna in hybrid tambacu from fish farms

“…However, dissolved oxygen levels were low in three fish farms, with mean values not suitable for the good production performance and health maintenance of farmed fish (Martins et al, 2010;Godoi et al, 2012).…”

“…Suboptimal feeding and poor water quality are stressors that result in impaired growth, which increases the susceptibility to opportunistic parasites and pathogens. However, in fish farms where fish had better nutritional and sanitary conditions, as well as adequate oxygen levels, there was a lower prevalence of this ciliate parasite (Martins et al, 2010;Omeji et al, 2010). Despite the high prevalence, no clinical signs of ichthyophthiriasis were found, showing a chronic parasitism, since in the Amazon region there are no sudden changes in temperatures that may favor the occurrence of acute and severe infections.…”

“…However, this can lead to the incidence of a variety of parasitoses if culture conditions are inadequate (Tavares-Dias et al, 2001a;Lizama et al, 2007;Eiras et al, 2010;Martins et al, 2010;Godoi et al, 2012), which may result in epizooties, depending on the abundance of parasites and on the disease severity. These diseases, however, are most prevalent in newly cultured species, or in newly developed culture systems, and become rare once husbandry practices are well developed.…”

Expanded description of Lamproglena monodi (Copepoda: Lernaeidae), parasitizing native and introduced fishes in Brazil

“…However, an analysis on these two studies reveals some intraspecies differences in relation to the specimens collected in Brazil. Azevedo et al (2010) and Martins et al (2010) recorded this species as Lamproglena sp., respectively, in Guandu River, state of Rio de Janeiro and in the state of Santa Catarina, Brazil.…”

Publications in the field of Agrarian Sciences in the Anais da Academia Brasileira de Ciências: what next?

“…For instance, the work of Martins et al (2010) questioned whether the parasitic fauna of the Nile fish Oreochromis niloticus (Linnaeus, 1758) could be affected by different production systems. The efficiency of boron application in an Oxisol cultivated with banana in Anais da Academia Brasileira de Ciências (2012) 84 (1) et al , Londe et al 2010.…”