Abstract
Crustaceans are found in every type of aquatic ecosystem, and there are species adapted to extremes of temperature, pressure, salinity, and even anoxia. Parasitic isopods are typically marine and usually inhabit the warmer seas. They are blood-feeding; several species settle in the buccal cavity of fish, others live in the gill chamber or on the body surface including the fins. Isopods can cause morbidity and mortality in captive fish populations. The damage of gill filaments thus was not only due to the feeding but also by the pressure exerted by the dorsal side of the parasite. Erosion of gill lamellae, damage of gill rakers and pale gills were the severe gross lesions observed as a consequence of isopod infestation. Infested fish exhibited histopathological anomalies such as tissue reactions, primarily associated with the formation of granulomas consisted of macrophages and epithelioid cells, which are occasionally surrounded by a thin rim of fibroblasts. A marked increase in the size of the parasite is associated with the development of marsupium full of juvenile parasite. The infestation usually pressure atrophy often accompanies the presence of larger parasites. They may lead to economic losses in commercial species of fish. Thus, treating fishes infected with isopods without treating their environment may only provide temporary relief. It is also important to recognize the potential for secondary infections associated with severe isopod infections.
References
Brusca RC (1981) A monograph on the isopoda, cymothoidae (crustacea) of the eastern Pacific. Zool J Linn Soc 73:117–199
Davies AJ (1982) Further studies on Haemogregarina bigemina Laveran and Mesnil, the marine Wsh Blennius pholis, and the isopod Gnathia maxillaries. J Protozool 29:576–583
Eller LL (1975) Gill lesions in fresh water teleosts. In: Ribelin WE, Migaki G (eds) The pathology of fishes. The University of Wisconsin Press, Madison, pp 305–330
Honma Y, Tsunaki S, Chiba A, Ho JS (1991) Histological studies on the juvenile gnathiid (isopoda, crustacea) parasitic on the branchial chamber wall of the stingray, Dasyatis akajei, in the sea of Japan. Report of the Sado Marine Biological Station, Niigata University 21: 37–47
Kabata Z (1970) Crustacea as enemies of fishes. In: Snieszko SF, Axelrod HR (eds) Diseases of fishes. Tropical Fish Hobbyist Publications, Inc., Jersey City, pp 1–171
Kabata Z (1984) Diseases caused by metazoan: crustacean. In: Kinne O (ed) Disease of marine animals, vol 4., Introduction, pisces, Part 1Biologische Anstalt Helgoland, Hamburg, pp 321–347
Kabata Z (1985) Parasites and diseases of fish cultured in the tropics. Tayler and Francis, Isopoda 318
Lester RJG, Roubal FR (1995) Phylum arthropoda. In: Woo PTK (ed) Fish diseases and disorders, Vol 1. Protozoan and metazoan infections. CAB International, Wallingford, pp 475–598
Rameshkumar G, Ravichandran S, Trilles (2011) Cymothoidae (crustacea, isopoda) from Indian fishes. Acta Parasitol 56(1):78–91
Rameshkumar G, Ravichandran S, Trilles JP (2012a) Observation on an isopod parasitizing the edible fish Parastromateus niger in the Parangipettai coast of India. J Environ Biol 33(2):191–193
Rameshkumar G, Ravichandran S, Sivasubramanian K, Trilles JP (2012b) New occurrence of parasitic isopods from Indian fishes. J Parasit Dis. doi:10.1007/s12639-012-0128-x
Rand TG (1986) The histopathology of infection of Paranthias furcifer (L.) (osteichthyes serranidae) by Nerocila accuminata (schioedte and meinert) (Crustacea) (isopoda–cymothoidae). J Fish Dis 9:143–146
Ravichandran S, Soundarapandian P, Kannupandi T (2000) Infestation of isopod parasite Epipenaeon ingens Nobili parasitized on Penaeus monodon from Parangipettai coastal environment. Adv Biosci 19:73–78
Ravichandran S, Ranjith Singh AJA, Veerappan N (2001) Parasite induced vibriosis in Chirocentrus dorab off Parangipettai coastal waters. Curr Sci 80:101–102
Ravichandran S (2007) Infestation of isopod parasite Lironeca puhi in slender needle fish Strongylura leiura. Res J Parasitol 2:87–93
Ravichandran S, Ajith Kumar TT (2007) Defense and offence mechanism of fishes. Seq Queen 15:12–15
Ravichandran S, Ajith Kumar TT, Ronald Ross P, Muthulingam M (2007) Histopathology of the infestation of parasitic isopod Joryma tartoor of the host fish Parastromates niger. Res J Parasitol 2:68–71
Romestand B, Janicot M, Trilles JP (1977) Modifications tissulaires et reactions de defence chez quelques teleosteens parasites par les cymothoidae (crustaces, isopodes, hemalophages). Annales de parasitologie Humaine et compare 52:171–180
Romestand B (1979) Ecophysiology of parasite cymothoidea. Ann de parasitol Paris 54:423–448
Stephenson AB (1976) Gill damage in fish produced by buccal parasites. Rec Auckl Inst Mus 13:167–173
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Authors are thankful to the Department of Science and Technology and the Ministry of Environment & Forest, Government of India for providing financial support and to the Dean, Faculty of Marine Sciences for providing facilities and encouragement.
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Rameshkumar, G., Ravichandran, S. Problems caused by isopod parasites in commercial fishes. J Parasit Dis 38, 138–141 (2014). https://doi.org/10.1007/s12639-012-0210-4
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DOI: https://doi.org/10.1007/s12639-012-0210-4