Abdolmalaki, S., Ghaninezhad, D., Nahrvar, R., Sayad rahim, M., Khedmati, K., Norozi, H., Rastin, R. (2009). POPULATION DYNAMICS AND REPRODUCTIVE BIOLOGY OF CRAYFISH (ASTACUS LEPTODACTYLUS ESCHSCHOLTZ, 1823) IN SHORABIL LAKE (ARDABIL PROVINCE), NORTHWEST OF IRAN. , 18(3), 109-118. doi: 10.22092/isfj.2009.115502
Sh. Abdolmalaki; D. Ghaninezhad; R. Nahrvar; M. Sayad rahim; K. Khedmati; H. Norozi; R. Rastin. "POPULATION DYNAMICS AND REPRODUCTIVE BIOLOGY OF CRAYFISH (ASTACUS LEPTODACTYLUS ESCHSCHOLTZ, 1823) IN SHORABIL LAKE (ARDABIL PROVINCE), NORTHWEST OF IRAN". , 18, 3, 2009, 109-118. doi: 10.22092/isfj.2009.115502
Abdolmalaki, S., Ghaninezhad, D., Nahrvar, R., Sayad rahim, M., Khedmati, K., Norozi, H., Rastin, R. (2009). 'POPULATION DYNAMICS AND REPRODUCTIVE BIOLOGY OF CRAYFISH (ASTACUS LEPTODACTYLUS ESCHSCHOLTZ, 1823) IN SHORABIL LAKE (ARDABIL PROVINCE), NORTHWEST OF IRAN', , 18(3), pp. 109-118. doi: 10.22092/isfj.2009.115502
Abdolmalaki, S., Ghaninezhad, D., Nahrvar, R., Sayad rahim, M., Khedmati, K., Norozi, H., Rastin, R. POPULATION DYNAMICS AND REPRODUCTIVE BIOLOGY OF CRAYFISH (ASTACUS LEPTODACTYLUS ESCHSCHOLTZ, 1823) IN SHORABIL LAKE (ARDABIL PROVINCE), NORTHWEST OF IRAN. , 2009; 18(3): 109-118. doi: 10.22092/isfj.2009.115502

POPULATION DYNAMICS AND REPRODUCTIVE BIOLOGY OF CRAYFISH (ASTACUS LEPTODACTYLUS ESCHSCHOLTZ, 1823) IN SHORABIL LAKE (ARDABIL PROVINCE), NORTHWEST OF IRAN

مجله علمی شیلات ایران
Article 11, Volume 18, Issue 3, January and February 2008, Pages 109-118    PDF (509.98 K)
Document Type: Research Paper
DOI: 10.22092/isfj.2009.115502
Authors
Sh. Abdolmalaki; D. Ghaninezhad; R. Nahrvar; M. Sayad rahim; K. Khedmati; H. Norozi; R. Rastin
Abstract
Freshwater crayfish (Astacus leptodactylus Eschscholtz, 1823) is a very valuable macrobentic organism which was introduced Aras reservoir to the Shorabil Kake in the amount of 15000 specimens during the years 2002-2006. This species produce very good population in the Shorabil Lake. We investigate biological, biomass and MSY of the crayfish in the Lake during the years 2006-2007.
Results showed that the mean total lengths and weight of this crayfish for both sexes were 82.5±32.4mmand 82.5±32.4g, respectively. Maximum total length and weight of the caught crayfish was 196mm and 328g respectively. The sex ratios of male: female crayfish caught with a funnel trap of 10mm mesh size (stretched mesh) were estimated at 1:2.4 that was significantly difference from 1:1 ratio (X2= 479.01; P<0.05). Mean number of ovarian and pleopodal eggs were estimated at 396.6±36.5 and 311.11±22.92 eggs with 95% confidence limits, respectively.
The time of the first molting of the male stared from beginning of the May at a water temperature of around 14oC and ended in mid-June. The second molting of the male and the first molting of the female is done simultaneously and started in beginning of the October at a water temperature of around 17oC. Reproduction period of this species started from beginning of the December and lasted until the mid-June in Shorabil Lake.
Keywords
Freshwater Crayfish; ASTACUS LEPTODACTYLUS; Reproduction; SHORABIL LAKE; ARDEBIL PROVINCE
References
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