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The evaluation of gnathiid (Crustacea: Isopoda: Gnathidae) parasitism in goldblotch grouper (Epinephelus costae Staindahner, 1878) in the northeastern Mediterranean Sea using the self-organizing map (SOM)

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Abstract

The self-organizing map (SOM), which is widely used in economics and engineering applications, is a type of artificial neural network trained without supervision. SOM is used to represent multidimensional data in much lower dimensional spaces—usually in two dimensions (2D)—while preserving the topological properties of the input space. In this study, 2D maps were produced by using SOM to display the relationship between seasons, length, weight, and isopod infestation of goldblotch grouper (Epinephelus costae Staindahner, 1878). This is first study of gnathiid isopod praniza larvae infesting goldblotch grouper (E. costae Staindahner, 1878) in the northeast Mediterranean Sea (36°36′ N–36°07′ E, 35°52′ N–36°25′ E) in Iskenderun Bay. Fish were sampled monthly from Iskenderun Bay for a period of 12 months from 2006 May to 2007 April (Nt = 331, \( {\hbox{Wt}}\pm {\hbox{SD}}\left( {\hbox{range}} \right) = {392}.{92}\pm {72}.{76}\,{\hbox{g}}\left( {{169} - {927}\,{\hbox{g}}} \right) \),\( {\hbox{TLt}}\pm {\hbox{SD}}\left( {\hbox{range}} \right) = {3}0.{85}\pm {3}.{88}\,{\hbox{cm}}\left( {{17} - {48}.{3}\,{\hbox{cm}}} \right) \)). Gnathia sp. was only extracted from the epithelium of the buccal cavity and internal side of the gills arch. The monthly patterns in infested fish samples (Np = 109, \( {\hbox{Wp}}\pm {\hbox{SD}}\left( {\hbox{range}} \right) = {349}.{25}\pm {182}.{79}\,{\hbox{g}}\left( {{169} - {853}\,{\hbox{g}}} \right) \), \( {\hbox{TLt}}\pm {\hbox{SD}}\left( {\hbox{range}} \right) = {26}.0{5}\pm {12}.{68}\,{\hbox{cm}}\left( {{18}.{2} - {45}.0\,{\hbox{cm}}} \right) \)) infestation rates (mean prevalence, P = 28.12% (0–60) and mean intensity \( \left( {{\hbox{MI}}\pm {\hbox{SD}} = {23}.{69}\pm {14}.{78}\left( {{4} - {82}} \right)} \right. \), the relationship between length–weight and infested/non-infested fish were calculated. Although the gnathiid parasite high intensities were observed in fish, there was no significant effect on the growth and general health condition of infested fish.

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Acknowledgments

The authors would like to thank the staff at Sirinyer Ltd. (Iskenderun) for their help throughout this research, Dr. M. Ayce Genc and Dr. Mevlut Aktas (Mustafa Kemal University) and Dr. Emel ORAL (Cukurova University) for their technical comments. This work (M.Sc. project) was supported in part by grant from the Scientific Research Fund of Mustafa Kemal University.

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Authors and Affiliations

  1. Fish Disease Laboratory, Department of Aquaculture, Faculty of Fisheries, Mustafa Kemal University, 31200, Meydan Mh. 512 Sk., Iskenderun, Hatay, Turkey

    Ercument Genc & Cavit Erol

  2. Department of Computer Engineering, Faculty of Engineering and Architecture, Cukurova University, 01330, Balcali, Adana, Turkey

    Mustafa Oral

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  1. Ercument Genc
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Correspondence to Ercument Genc.

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Genc, E., Oral, M. & Erol, C. The evaluation of gnathiid (Crustacea: Isopoda: Gnathidae) parasitism in goldblotch grouper (Epinephelus costae Staindahner, 1878) in the northeastern Mediterranean Sea using the self-organizing map (SOM). Parasitol Res 108, 1417–1424 (2011). https://doi.org/10.1007/s00436-010-2188-0

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