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All Journal HAYATI Journal of Biosciences
Zarizal Suhaili
East Coast Environmental Research Institute, Universiti Sultan Zainal Abidin, Gong Badak Campus, Terengganu, Malaysia. Holistic Students Development Centre, Universiti Sultan Zainal Abidin, Gong Badak Campus, Terengganu, Malaysia
Agriculture, Biological Sciences & Forestry Earth & Planetary Sciences

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Identification of Vermamoeba vermiformis and Tetramitus sp. Isolated from the Gills of Oreochromis sp. (Red Hybrid Tilapia) Wan NorNadhirah Wan Noor Azmi; Fatimah Hashim; Zarizal Suhaili; Suzana Misbah; Nor Hafizah Zakaria
HAYATI Journal of Biosciences Vol. 30 No. 3 (2023): May 2023
Publisher : Bogor Agricultural University, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.4308/hjb.30.3.404-412

Abstract

This study is the first report of an infestation of amoeba in the gills of asymptomatic Oreochromis sp. from the Manir River, Terengganu, Malaysia. The results confirmed the presence of two species of amoeba, Vermamoeba vermiformis and Tetratmitus sp., based on the 18 ribosomal RNA gene sequences with 99% sequence similarity. Morphological observations using light and scanning electron microscopy supported the findings, demonstrating both amoeba species' specific features and locomotions. In the trophozoite stage, the mean size of V. vermiformis in the locomotive form was between 25.55 µm in length and 4.17 µm in width. The mean size of Tetramitus sp. was 20.96 µm in length and 8.66 µm in width. The diameter of the cyst for V. vermiformis was 4.67 µm and Tetramitus sp. was 3.37 µm. V. vermiformis was characterized by cylindrical trophozoites and single monopodial morphology. Tetramitus sp. showed a limax-type and various cell shapes. Infestation of the amoeba was also confirmed by histopathological observation in the lamella region with distinct amoeba characteristics compared to the lamellae's epithelial tissue. These findings revealed the presence of V. vermiformis and Tetramitus sp. infestation in the gills of Oreochromis sp. and its potential pathogenic activity, whilst the symbiosis interaction in Oreochromis sp. is still unidentified.
Co-Authors Fatimah Hashim Nor Hafizah Zakaria Suzana Misbah Wan NorNadhirah Wan Noor Azmi