Trace elements and parasitism in Nile tilapia farmed in the Southern Brazil

Abstract

This study evaluated the trace elements and parasitological indices in Nile tilapia examined from two different facilities, named as swine-consorted, using pig manure, and monoculture. For trace element analysis, the fish muscle tissue was collected individually in each facility. Each portion was weighed, dried in a stove at 60°C for 48 h and analyzed by Energy Dispersive X-ray Fluorescence Spectrometry (EDXRF). Parasitological analysis followed the routine method for parasites collection, quantification and identification. The predominant element was zinc (Zn) followed by iron (Fe) and arsenic (As) in fish from both facilities. Fish from swine-consorted system had greater values of abundance and mean intensity of trichodinids and fish from monoculture showed higher abundance and mean intensity of monogeneans. Nevertheless, no signs of damage to fish production was observed. The contents of the elements Zn, Fe, As, cooper (Cu) and mercury (Hg) were above of the maximum permitted limits recommended by the Brazilian legislation.

Parasitological and histopathological diagnosis of a non-native fish (Oreochromis sp.) with a noticeable presence in a natural Brazilian river environment

“…All parasites identified in the present study were previously identified parasitizing tilapia (Ghiraldelli et al 2006a, b;Martins and Ghiraldelli 2008;Jero ˆnimo et al 2010, b;Valladao et al 2014;Nunes et al 2016). However, the species were all identified in farmed tilapia, different from those verified in the present study as well, no zoonotic parasites were identified.…”

“…The basin of the Cachoeira river is located in Joinville, the most populous city in the state of Santa Catarina, Brazil (Ribeiro and Oliveira 2014), and receives contaminating effluents, mainly from the Industrial District where there are metal, textile and plastic industries, as well as The city holds a few fish farms (Ghiraldelli et al 2006a, b;Jero ˆnimo et al 2011b;Nunes et al 2016;Steckert et al 2018) therefore, unintentional fish getaways might occur. Thus, it might be happening at the Cachoeira river with tilapia.…”

Hematological analysis and relative condition factor in naturally parasitized Nile tilapia

“…(Azevedo et al, 2006;Ghiraldelli et al, 2006a;Jerônimo et al, 2011;Zago et al, 2014;Nunes et al, 2016) and the protozoans have been shown to be the most prevalent group in Santa Catarina. Ranzani-Paiva et al (2005), in a study with Nile tilapia from a reservoir in São Paulo, observed among other parasites, Trichodina (Azevedo et al, 2006;Ghiraldelli et al, 2006a;Jerônimo et al, 2011;Nunes et al, 2016). The above suggests a possible variation of the parasitological fauna of Oreochromis niloticus among the fish farms and along with culture cycles in the same region.…”

“…Some studies suggest that parasites are also vectors of other pathogens, which can lead to acute mortality of fish (Xu et al, 2012;Pilloux et al, 2015). Ectoparasites are common in tilapia culture and have been reported by several authors (Ghiraldelli et al, 2006a;Jerônimo et al, 2011;Tavares-Dias et al, 2013;Nunes et al, 2016) and according to Moraes & Martins (2004) are directly related to water quality and animal management.…”

First report of Trichodinella and new geographical records of trichodinids in Nile tilapia (Oreochromis niloticus) farmed in Brazil

“…Considering the socioeconomic importance of Nile tilapia (Oreochromis niloticus) within Brazilian aquaculture and the economic impact of parasitic diseases, very little information on these groups is available. Only three out of the eleven genera of the family Trichodinidae have so far been reported parasitizing Nile tilapias in Brazil, namely Trichodina Ehrenberg, 1838 (Trichodina centrostrigeata Basson, Van As and Paperna, 1983, T. compacta Van As and Basson, 1989, T. heterodentata Duncan, 1977 Van As and Basson, 1989, T. migala Van As and, Paratrichodina Lom, 1963 (Paratrichodina africana Kazubski andEl-Tantawy, 1986) and Tripartiella Lom, 1959(Tripartiella orthodens Basson and Van As, 1987) (GHIRALDELLI et al, 2006MARTINS & GHIRALDELLI, 2008;PANTOJA et al, 2012;VALLADÃO et al, 2013VALLADÃO et al, , 2016ZAGO et al, 2014;NUNES et al, 2016).…”