Comparison of morphometric and meristic characteristics of Rutilus frisii kutum in Caspian river estuaries
Subject Areas : marine biology
Mehrnaz Mohseni
1
(
Department of Biology, Jahrom Branch, Islamic Azad University, Jahrom, Ira
)
Farangis Ghassemi
2
(
Bology department, Jahrom branch, Islsmic Azad University
)
Keywords: Diversity, Caspian Whitefish, Taxonomic keys,
Abstract :
Considering the economic value of fish belong to Cyprinidae family, and the importance of ecology in the exploitation of marine resources, diversity identification of whitefish (Rutilus frisii kutum) was conducted in the Sefidrud, Karganroud, Anzali lagoon, Chamkhaleh and Chelvand estuaries in Gilan province. For this purpose, 30 fish were collected from each river. After measuring thirteen morphometric and 9 meristic characters,the mean, standard deviation, minimum and maximum sizes, and coefficient of variation of all studied parameters in each river were calculated. The obtained data were analyzed by ANOVA, and the groups were compared by Tukey test. Average of the morphometric characters in the rivers was 7.4, 10.06, 10.46, 12.36 and 12.75 percent, respectively. Due to significant difference (P <0.01) in the mean of studied parameters and high coefficient of variation among five rivers, the whitefish were different. The average of coefficient of variation in most morphological traits increased from western estuaries to eastern one, and the difference of traits is proportional to estuaries distance. Sefidrood showed the highest differences in morphometric traits and the lowest one was observed in Chelvand. The average of coefficient of variation of nine meristic traits in above rivers was 6.56, 6.48, 6.36, 6.36 and 11.5% respectively, and seven of them have no significant difference. The results showed that independent’s of spring whitefish are in the studied rivers , but due to the low mean coefficient of variation in the meristic characters of them, probably the environment has been effective in the population’s diversity.
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