SPATIAL DISTRIBUTION OF MONOGENEANS AND THEIR PREVALENCE IN TWO FRESHWATER FISH SPECIES IN RELATION TO SOME PHYSICOCHEMICAL PARAMETERS OF KENYIR LAKE, MALAYSIA
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Date
2012
Journal Title
Journal ISSN
Volume Title
Publisher
Journal of Sustainability Science and Management
Abstract
A parasitological investigation was carried out on two freshwater fish species - Hampala
macrolepidota andHemibargrus nemurus (n = 460) for gill monogeneans from four stations in Kenyir
Lake [station 1-Kiang River (5"6'49.47"N, 102"44'36.60" E); station II- Petang Island (4"58'35.65"
N, 102"47'3.74" E), station III -Ketiar River (5"3'48.38" N, 102"34'14.70" E) and station N
-Tanjung Mentong (4"48'36.54" N, 102"45'40.56" E)]. Four monogenean parasites were detected
viz: Biforr:ohaptor baungi and Cornudiscoides malayensis from the gills of Hemibargrus nemurus;
Dactylogyrus quadribrachiatus and D. macrolepidoti from gills of Hampala macrolepidota. Their
spatial distributions on the host gills are reported. The prevalences ofthese parasites were correlated
to physico-chemical parameters (temperature, dissolved oxygen, pH, ammonia, nitrite, and alkalinity)
of the lake water. The results revealed that all the stations were infected, but the highest infestation
was in the third station (Ketiar River) with 1000/o prevalence and intensity of 43 individual worms
per host Correlation between physico-chemical parameters and parasites prevalence shows statistical
significance (P < 0.05), especially between prevalence, mean intensity and total ammonia nitrogen
(TAN). In conclusion, monogeneans from these two fish species were not randomly distributed but
showed site specificity.
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Keywords
Prevalence, Mean intensity, Physico-Chemical parameters, Bifurcohaptor baungi, Dactylogyrus quadribrachiatus