Some specific population structure of Spirlin (Alburnoides bipunctatus) in the main Cluster of Talar River in Mazandaran province
Subject Areas : New Technologies in Aquaculture Development
Keywords: population structure, Talar River, Keywords: Mazandaran province, Spirlin,
Abstract :
Abstract During 13 months of sampling (September 2009 to Sep 2010), 809 Spirlins (Alburnoides bipunctatus) were caught from Mazandaran Talar river from which 412 spirlins belonged to Keselian cluster and 397 spirlins belonged to Tejoon cluster. Fishing was performed by a 250 - 300 volts electro-shocking machine. The assessments showed 30 morphometric and 10 meristic specifications. The result of t-test indicated a meaningful difference in 13 morphometric & 7 meristic specifications between spirlin fish of The Two clusters (P 0.05). Four age classes were observed in spirlin population in which the age group of 2⁺ was the most abundant (49%). Also, in general, the total population consisted of female fish (50%), male fish (39%) and immature fish (11%). The maximum length in this research was 96.14 mm and the maximum weight was 9.27 grms. The relationship between length-weight showed a high correlation between Keselian cluster (r2= 0.98) and Tejoon (r2=0.97). The conditional factor indicated the obesity of most Keselian species. The growth pattern has shown a negative alometric pattern in spirlin species of the two clusters and Instant growth rate of immature species has been more compared to other age groups. It can be concluded that Spirlins of the two clusters have some differences considering some morphplogical specifications and for a more complete population segregation of this species, modern genetic methods must be used such as PCR, Electrophoresis and micro satellite.
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