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Infestation of Ectoparasites in Gudusia Chapra (hamilton)

Hamida Khanum
Department of Zoology, University of Dhaka, Dhaka

Haroon Or Rashid Khan
Department of Zoology, University of Dhaka, Dhaka

Rimi Farhana
Department of Zoology, University of Dhaka, Dhaka

Abstract/ Executive Summary:

One hundred Gudusia chapra ranging from 6 to 17 cm were examined on monthly basis. Of 100 fishes, 32 were male and 68 were female, sex ratio being 1:2.1. A total of 163 parasites were recovered from the host, which 70% were trematodes and 16% copepods. The overall prevalence of infection was 86% and the mean±SD intensity was 1.89±0.91. Heavy infestations (100%) were recorded in males of the largest (14.25-17.0 cm) and the smallest (6.0-8.75 cm) length groups. Total infection rate was also higher in males (87.72%) than in females (83.82%). Intensity of infestation in males and females was 1.62 and 2.03, respectively.

Keywords: Gudusia chapra, ectoparasites, trematode, copepod, infestation intensity

Location:

Start Date:

End Date:

Program Area: Pest Management

Commodity:

Objectives:

The study of the ectoparasitic infestations of G. chapra in which the copepod parasite Ergasilus versicolor is being reported for the first time in Bangladesh.

Methodology:

A total of 100 fishes collected on a monthly basis were examined to determine their ectoparasite community. The fishes were separated according to their sex and were measured for total length. At first microscopic examinations were done for ectoparasites and for any cysts, ulceration and scars. Then the gill filaments were dissected out of the branchial cavity and placed in a petridish containing normal saline solution (0.75% NaCl). All the collected parasites were fixed in glycerin alcohol (90 parts of 70% ethyl alcohol and 10 parts of glycerol), stained in Borax carmine and finally mounted in DPX.

Source of Information: Univ. j. zool. Rajshahi Univ. Vol. 25, 2006. pp. 23-25

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

In the host the female fishes were more infected than the male ones. The female is responsible for higher infestation rather than ecological conditions. The present study recorded a significant relationship between the host length and the intensity of parasites in G. chapra. It revealed that the fishes of the 2nd intermediate (11.50-14.25 cm) and large (14.25-17.0 cm) length groups were heavily infested than the smallest and the 1st intermediate length groups. These results are in good accord that prevalence and intensity of infestation generally increased with the host size up to a certain point and then declined.

Knowledge Management: Journal