Efeito do cloreto de sódio sobre as respostas fisiológicas e controle de helmintos monogenóides em tambaqui (Colossoma macropomum)

Abstract

ResumoO objetivo deste trabalho foi avaliar o efeito do sal (NaCl) sobre as respostas fisiológicas e controle de helmintos monogenóides em tambaqui (Colossoma macropomum). Para isso, juvenis de tambaqui (42,38 ± 0,47 g; 13,90 ± 0,06 cm) foram transferidos para tanques de 350L e aclimatados por um período de 24 horas. Os ensaios foram conduzidos utilizando as concentrações de 0, 2, 4, 6 e 8 g de sal comum L -1 de água, nos tempos de exposição de 30, 60 e 120 minutos, com três repetições por tratamento. A tolerância dos tambaquis ao sal e a eficácia deste sobre os helmintos monogenóides foi avaliada mediante análise dos indicadores fisiológicos (glicose, cloretos, sódio e potássio plasmático) e parasitológicos (número total de parasitas e prevalência). Tambaquis expostos a 4 g NaCl L -1 por 120 minutos, 6 e 8 g NaCl L -1 por 60 e 120 minutos apresentaram maior elevação da glicose plasmática e na concentração de 8 g NaCl L -1 por 120 minutos maiores níveis de cloreto plasmático. A prevalência de monogenóides nas brânquias foi de 100% e todas as concentrações de sal avaliadas neste estudo não foram eficazes na redução dos helmintos monogenóides em tambaqui. PalavRas-Chave: estresse, fisiologia, sanidade, monogenóides, piscicultura. Effect of sodium chloride on physiological responses and monogenean control in tambaqui (Colossoma macropomum) abstRaCtThe objective of this work was to evaluate the effect of salt (NaCl) on physiological responses and monogenean control in tambaqui (Colossoma macropomum). Juveniles of tambaqui (42.38 ± 0.47 g; 13.90 ± 0.06 cm) were transferred to 350L tanks and acclimated for a period of 24 hours. The assays were conducted using the concentrations of 0, 2, 4, 6 and 8 g of NaCl L -1 of water, exposed to 30, 60 and 120 minutes, with three replicates in each treatment. The tambaqui tolerance to salt and the efficacy against monogenean were evaluated by physiological analysis (glucose, chloride, sodium and potassium plasmatic concentrations) and parasitic indices (total number of parasites and prevalence). Tambaquis exposed to 4 g NaCl L -1 for 120 minutes, 6 and 8 g NaCl L -1 for 60 and 120 minutes showed increased glucose levels while those exposed to 8 g NaCl L -1 for 120 minutes presented increased chloride levels. The prevalence of monogeneans in the gills of tambaqui was 100% and the salt concentrations evaluated in this study were not effective in the reduction of monogenean parasites.

Efficacy of chlorine, sodium chloride and trichlorfon baths against monogenean Dawestrema cycloancistrium parasite of pirarucu Arapaima gigas

“…Salt baths at concentrations 2–8 g/L for 30–120 min were ineffective in reducing the monogeneans Anacanthorus spathulatus , Notozothecium janauachensis , and Mymarothecium boegeri from C . macropomum (Chagas et al, 2012). Similarly, Forwood et al (2013) found no in vivo effectiveness of sodium chloride against L .…”

Mebendazole dietary supplementation controls Monogenoidea (Platyhelminthes: Dactylogyridae) and does not alter the physiology of the freshwater fish Colossoma macropomum (Cuvier, 1818)

“…Therapeutic bathes (Hashimoto et al, 2016;Malheiros et al, 2016;Soares et al, 2016) and medicated diet (Kim and Choi, 1998;Forwood et al, 2013;Militz et al, 2013) have been used to control monogenean infestations. The most used treatments for monogenean parasites are formalin, potassium permanganate, sodium chloride, acetic acid, hydrogen peroxide (Kabata, 1985;Thatcher, 1991;Fajer-Ávila et al, 2003;Araújo et al, 2004;Bowker et al, 2012;Chagas et al, 2012;Farmer et al, 2013).…”