Studies on parasitic diseases among wild and cultured eel fish (anguilla anguilla)‎

Abstract EN

Three years study was performed for the detection of parasitic diseases in the cultured and wild eel (Anguilla anguilla).

A total number of 800 eel specimens (400 wild fish from lakes and 400 cultured ones from commercial fish farms in El-Sarkia, Kafr El-sheikh and El-Beharah provinces was collected and subjected to clinical signs, postmortem and parasitological examinations.

Also trials for the treatment of some parasitic diseases were evaluated.

The total prevalence of parasitic infection was 78.1% among the examined fish.

The rate in wild and cultured eels was 72.5 and 83.8%, respectively.

The total rate of Trichodina species, Ichthyophthirius multifiliis, Myxidium giardi, Myxobolus dermatobius, monogeneans, Eimeria, Anguillicola crassus, Anisakiid larvae, cestodes and Ergasilus species infections was 31.25, 2.5, 12.8, 22.5, 48.8, 0.5, 78.1, 0.4, 8.9 and 19 % respectively.

The detected monogenetic trematodes and its total prevalence were Pseudodactylogyrus species (31.3%), Dactylogyrus species (10%), Gyrodactylus species (4.4%) and Quadriacanthus species (3.1%).

The total rate of Proteocephalus species, Cyathocephalus species and unidentified cestode infection was 6.9, 1.9 and 0.1 % respectively.

The clinical signs and postmortem changes associated with each infection were recorded.

Our results showed that formalin and praziquental at concentration of 0.25 ppm and 10mg/L for 1 hr was effective for controlling trichodinosis and pseudodactylogyrosis, respectively.

With the aid of the radiographic method, the A.

crassus infection and changes in the gasbladder of infected eel specimens can be monitored successfully.

Electrophoretic analysis of adult Anguillicola crassus proteins in SDS-PAGE revealed a series of bands were illustrated.

Levamisole at concentrations of 1 or 2mg/L for 24 or 48 hr showed promising result in the treatment of anguillicolosis.