A study on ectoparasites of pond cultured crossbred freshwater fish, kerai lampam at Pusat Perikanan Perlok Jerantut, Pahang

Abstract

This is a study of ectoparasites on crossbred fish, Kerai Lampam, a crossbred between a female Hyspibarbus peirrei (Sauvages, 1880) Kerai kunyit and male Barbonymus gonionotus ( Bleeker, 1850) Lampam Jawa. The objectives of the study were to identify the ectoparasites and to calculate the prevalence and mean intensity of the infection. Samples were collected and examined at Pusat Perikanan Perlok Pahang and analyzed in Biodiversity lab UMT. 3 categories of fishes, broodstock or big fish, juveniles or medium and fingerlings were diagnosed. 8 parasites identified were ie Piscinoodinium pillulare, Dacty/ogyrus sp. , Trichodina sp., Lernea sp., copepode (Lemea stage), Sapro/egnea sp., Metacercaria and unidentified mites. Results showed that, there was a high infection of Lernea sp. on big fish, while fingerlings were heavily infested with Piscinoodinium pillulare . Micrographs of gills filament infested by adult P. pillulare showed clear hyperplastic changes and appeared stunted viewed under SEM (JEOL JSM6360 LA). Micrograph of adult P. pillulare called trophont appear rounded from dorsal view and ovoid from lateral view. The basal attachment of trophont known as rhizoid and hyperplasia were clearly seen in histological section under light microscope.