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Short reports

ScienceAsia 34 (2008): 416-423 |doi: 10.2306/scienceasia1513-1874.2008.34.416

Development and identification of the ricefish Oryzias in Thailand

Apichart Termvidchakorna,*, Wichian Magtoonb

ABSTRACT:     Ricefish larval specimens were collected from breeding tanks and rearing ponds. The larvae were divided into 3 developmental stages i.e. larval, post-larval, and juvenile stages, and their morphometric and meristic characters, as well as chromatophore pigment patterns were studied. The chromatophore pigment pattern, number of myomeres, dorsal fin rays and anal fin rays were characteristics used for species identification. For Oryzias larvae, the chromatophore pigmentation on the gut, midline, and dorsal and ventral parts of the body were important characteristics. The caudal, dorsal, and anal fin rays were also the characteristics used in the case of identifying the juvenile fish. Using the above criteria, four species of ricefish, i.e. O. javanicus, O. dancena, O. mekongensis, and O. minutillus, were identified.

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a Prachinburi Inland Fisheries Station. Inland Fisheries Research and Development Bureau, Department of Fisheries. Krabinburi, Prachinburi Province 20500, Thailand
b Department of Biology, Faculty of Science, Srinakharinwirot University, Sukhumvit 23, Bangkok 10110, Thailand

* Corresponding author, E-mail: inland_larvae@yahoo.com

Received 23 May 2008, Accepted 13 Nov 2008