Screening of parasitic and IHHNV infections in wild giant freshwater prawn Macrobrachium rosenbergii from Rejang River at Kuching, Sarawak

摘要

A preliminary survey of parasitic and infectious hypodermal and haematopoieticnecrosis virus (IHHNV) infections in giant freshwater prawn from the Damak Sea ofRejang River, Kuching, Sarawak was conducted. Symptoms of black spots/patches onthe rostrum, carapace, pleopods or telson were observed in most of the 107 samplescollected. Parasitic examination revealed sessiline peritrichs such as (Zoothamnium sp.),nematode larvae, gregarine stage and cocoon of leech with prevalences of 1.2%, 1.2%,5% and 17% respectively. Under histopathological examination, changes like accumulationof hemocytes around hepatopancreatic tubules due to vibriosis, basophilic intranuclearinclusions in the epithelium and E-cell of hepatopancreatic tubules as a result of HPVwere seen through the section. No positive infection of IHHNV was detected in 78 samples.As such, the wild giant freshwater prawns in Damak Sea of Rejang River in Kuching areIHHNV-free though infections of parvo-like virus and bacteria were seen in histopathology.