Survey of length - weight relationship of Astacus leptodactylus in shian dam Kermanshah province

Subject Areas : Marine Biology

P. Heshmatzad ¹ (Dept. of Fisheries, Facculty of Marine Science and Technology, Islamic Azad University Tehran North Branch)
B. Mokhayer ² (Dept. of Fisheries, Facculty of Marine Science and Technology, Islamic Azad University Tehran North Branch)
H. Emadi ³ (Dept. of Fisheries, Facculty of Marine Science and Technology, Islamic Azad University Tehran North Branch)

Received: 2013-02-24 Accepted : 2013-08-23 Published : 2013-11-22

Keywords: Kermanshah, weight, Astacus leptodactylus, length relationship, Shian Resorvor,

Abstract :

This research was done on Astacus leptodactylus in Shian Reservoir of Kermanshah province from September 2010 to August 2011. The purpose of this research was survey on length - weight of Astacus leptodactylus. Total specimens were 182 crayfish (Astacus leptodactylus), including 126 male & 56 female from Shian lake dam. The sex ratio observed was 2.25:1(males /females). The average length in female and male were 133.86 12.99 &137.80 13.93 mm respectively, so there were significant difference between them (P<0.05).Maximum length measured in males and females were 182 &160 mm respectively. Also the average weight for male and female crayfishes were 75.21 24.15 & 91.9833.57 gr respectively. There were significant differences between them (P<0.01).Maximum weight between male and female crayfishes were 244 &120 gr.In this research length and weight of male crayfish were more than that of the female crayfish.The function coefficients obtained between them length and weight crayfish was from 2.1 Shian dam W=  256.52