Correlation of Spawning Season and Maturational Parameters, Expression Levels of Vitellogenin Genes in Notopterus notopterus and Anematichthys armatus in Kwan Phayao, Thailand
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Abstract
The partial cDNA sequences of the vitellogenin (VTG) gene were cloned from the liver tissues of Notopterus notopterus and Anematichthys armatus. The expression levels of VTG could not be directly used for investigation of the spawning season of the two fish species, but we can indirectly rely on their expressions as the information indicates relation with spawning season. The gonadosomatic index (GSI) and hepatosomatic index (HSI) were also examined for analysis of the seasonal changes in the two fish species. Fish samples were collected from June 2012 to May 2013. Significant variations of VTG expression levels (P<0.05) were observed during the spawning season, from January (0.42 ± 0.07%) to August (0.97 ± 0.15%), and April (0.20 ± 0.09%) to September (1.04 ± 0.14%) for N. notopterus and A. armatus, respectively. The relationships between VTG genes expression, GSI and HSI values were determined using correlation analysis. The VTG expression levels have a significant (P<0 .01) direct correlation with the mean GSI values. The highest mean GSI values were also observed during the spawning season: August and September for N. notopterus and A. armatus, respectively. The mean HSI value has an inverse trend to the VTG expression and the mean GSI value. Thus, the VTG expression profile and the GSI values reflect the seasonal spawning on an annual basis of two fish species in Kwan Phayao.
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References
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