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ZFIN ID: ZDB-PUB-160624-8
A method for collecting eggs of Pseudocapillaria tomentosa (Nematoda: Capillariidae) from zebrafish Danio rerio and efficacy of heat and chlorine for killing the nematode's eggs
Martins, M.L., Watral, V., Rodrigues-Soares, J.P., Kent, M.L.
Date: 2017
Source: Journal of fish diseases   40(2): 169-182 (Journal)
Registered Authors: Kent, Michael
Keywords: egg collection technique, egg development, nematode, treatment, zebrafish
MeSH Terms:
  • Animals
  • Antinematodal Agents/pharmacology*
  • Aquaculture/methods*
  • Chlorine/pharmacology
  • Dose-Response Relationship, Drug
  • Enoplida Infections/parasitology
  • Enoplida Infections/prevention & control
  • Enoplida Infections/veterinary*
  • Fish Diseases/parasitology
  • Fish Diseases/prevention & control*
  • Hot Temperature
  • Ovum/drug effects
  • Trichuroidea/drug effects*
  • Trichuroidea/embryology
  • Zebrafish*
PubMed: 27334246 Full text @ J. Fish Dis.
Pseudocapillaria tomentosa is a common pathogen of zebrafish (Danio rerio) in research facilities. We developed a method to collect and concentrate the nematode eggs using a modified sugar centrifugation method and documented their normal development. Embryonating stages with blastomere formation followed by elongation of the embryo prior to larva formation cumulated in developed larvae inside the eggs and hatching after 5-10 day. We then evaluated the efficacy of heat and chlorine to kill them based on a larva development assay. Eggs were exposed to 40, 50, 60 °C for 30 min and 1 h. Chlorine treatment was performed at 100, 250, 500, 1000, 3000 and 6000 ppm for 10 min. Samples exposed to 40 °C for 30 min or 1 h showed incidences of larvated eggs similar to controls. In contrast, no larvation occurred with eggs exposed to either 50 or 60 °C for 30 min or 1 h. Remarkably, in repeated assays, samples exposed to low doses of chlorine (100, 250, 500 and 1000 ppm for 10 min) showed significantly higher incidence of larvation than controls. Eggs treated with 3000 ppm for 10 min did not develop larvae, and no eggs were found after 6000 ppm treatment.