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Assessment of Epinephelus coioides (Hamilton, 1822) aquaculture systems in the Gulf of Tonkin, Vietnam, by using fish parasites
Author(s) -
Truong T. V.,
Neubert K.,
Unger P.,
Bui T. Q.,
Ngo H. T. T.,
Palm H. W.,
Kleinertz S.
Publication year - 2017
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/jai.13475
Subject(s) - biology , epinephelus , mariculture , grouper , aquaculture , fishery , trichodina , fish farming , fauna , serranidae , parasite hosting , ecology , fish <actinopterygii> , gill , world wide web , computer science
Summary The parasite fauna of Epinephelus coioides can be used as an indicator to assess different aquaculture systems. A total of 133 E. coioides were collected from fishermen (wild fish) and marine fish farms (net cages, pond farms) in the Gulf of Tonkin (Ha Long, Cat Ba and Nghia Hung), Vietnam in 2013 and 2014, and examined for the presence of protozoan and metazoan parasites. Different patterns of parasite infections were found. The monogenean Pseudorhabdosynochus spp. was predominant in the net cage system; and the protozoans Trichodina spp. and Cryptocaryon irritans were found exclusively in pond and net cage cultivation sites in Nghia Hung and Cat Ba. These three species were assessed in addition to seven further indicator species and two dominance indices, to visualize the potential of assessing different aquaculture systems in Vietnam. This suggests the use of former shrimp ponds for grouper cultivation, reducing the pressure to further extend net cage cultivation in already highly influenced mariculture regions in Vietnam.