Amyloodinium sp. (Brown, 1931) (Dinoflagellida) infestation in captive stock of silver moony, Monodactylus argenteus (Linnaeus, 1758)


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Authors

  • Dani Thomas ICAR-Central institute of Brackishwater Aquaculture
  • A. Navaneeth Krishnan ICAR-Central institute of Brackishwater Aquaculture
  • P. Ezhil Praveena ICAR-Central institute of Brackishwater Aquaculture
  • J. Raymond Jani Angel ICAR-Central institute of Brackishwater Aquaculture
  • M. Kailasam ICAR-Central institute of Brackishwater Aquaculture
  • K.P. Jithendran ICAR-Central institute of Brackishwater Aquaculture

https://doi.org/10.21077/ijf.2020.67.4.88605-19

Abstract

This study was undertaken to investigate the cause of mortality in the captive stock of silver moony Monodactylus argenteus. The fishes showed severe infection of dinoflagellate protozoan Amyloodinium sp. (Blastodinida, Oodiniaceae) on gills and skin with complete mortality of the stock within a week. Histopathological changes were evident in the gill tissues with
severe lamellar epithelial cell hyperplasia and lamellar fusions with the presence of trophonts of Amyloodinium sp. Scanning electron microscopy (SEM) also revealed trophonts of Amyloodinium sp. of varying sizes in groups consisting of 3 to 5 trophonts tightly attached to gill lamellae. Source water contaminated with the tiny infectious form of the parasite (dinospores) favoured by higher salinity and low water temperature in the rearing tank could be the triggering factor for the spurt of infections. Proper quarantine and biosecurity protocols to prevent the potential sources of water-borne infection
sources are likely to be far more effective than treatment.

Keywords: Amyloodiniosis, Amyloodinium sp., Histopathology, Monodactylus argenteus, Scanning electron microscopy, Silver moony, Trophonts

Author Biography

  • Dani Thomas, ICAR-Central institute of Brackishwater Aquaculture
    Scientist, ICAR-Central institute of Brackishwater Aquaculture

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Submitted

2019-04-05

Published

2020-12-31

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How to Cite

Thomas, D., Krishnan, A. N., Praveena, P. E., Jani Angel, J. R., Kailasam, M., & Jithendran, K. (2020). Amyloodinium sp. (Brown, 1931) (Dinoflagellida) infestation in captive stock of silver moony, Monodactylus argenteus (Linnaeus, 1758). Indian Journal of Fisheries, 67(4). https://doi.org/10.21077/ijf.2020.67.4.88605-19