Copepod parasite Lepeophtheirus kabatai (Ho & Dojiri, 1977) infestation in orange spotted grouper, Epinephelus coioides (Hamilton, 1822) and its control in captivity


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Authors

  • Ritesh Ranjan
  • Biji Xavier
  • B. Santhosh
  • Sekar Megarajan
  • Shubhadeep Ghosh

Abstract

Parasitic infection in the orange spotted grouper Epinephelus coioides (Hamilton, 1822) and its control measures in captive conditions were studied. Wild collected groupers after 8 weeks of rearing in captivity showed lethargy and sluggishness. The caligid parasite, Lepeophtheirus kabatai (Ho & Dojiri, 1977) was identified from the affected fishes. This parasite was also prevalent in wild fish, however at lower prevalence (11%). The mean intensity of L. kabatai in fishes reared in captivity was 92.85±10.71, whereas in wild fish it was 3.54±1.61. Infected cultured fish were randomly assigned to one of five treatment groups (Group A, B, C, D and E). Group A fishes were given dip treatment in freshwater for 5 min, whereas groups B, C, D and E were given bath treatment in formalin @ 50, 100, 150 and 200 mg l-1 respectively for 30 min, followed by 5 min dip in freshwater. Group E fish were fully free of the infestation and no re-infestation was seen in them even after two months. This is the first study to confirm L. kabatai infestation in orange spotted grouper in both wild and cultured fish; and formalin treatment @ 200 mg l-1 was found effective control the infestation in captivity.

Author Biography

  • Shubhadeep Ghosh
    Senior Scientist

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Submitted

2017-12-11

Published

2018-09-30

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How to Cite

Ranjan, R., Xavier, B., Santhosh, B., Megarajan, S., & Ghosh, S. (2018). Copepod parasite Lepeophtheirus kabatai (Ho & Dojiri, 1977) infestation in orange spotted grouper, Epinephelus coioides (Hamilton, 1822) and its control in captivity. Indian Journal of Fisheries, 65(3). https://epubs.icar.org.in/index.php/IJF/article/view/76423