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Population dynamics of the Balanus improvises (Crustacean: Cirripedia) was studied in three stations Amirabad, Khazarabad in the eastern part and Noor in the central part of the Southern Coasts of the Caspian Sea. Sampling procedure was carried out monthly from July 2007 to July 2008. In this study longitudinal diameter aperture (orifice or opercula diameter) of 4118 individuals as well as dry weight and ash free dry weight of 141 barnacles were measured. Barnacle population density decreased in all three stations during autumn and winter. Barnacle density in Khazarabad were significantly higher than the other two stations (P > 0/05). In this study, for dry weight and ash free dry weight maximum 247 and 122 mg and minimum 0/5 and 0/25 mg were obtained respectively. Emergence of a young cohort in March 2008, indicates the reproduction season and larval recruitment at this time. Also the frequency of the larval recruitment from April 2004 until mid-summer had increased. Opercula diameter of B. improvisus correlated with dry weight (R = 0/87, n = 115) and ash free dry weight (R = 0/77, n =115). In addition, two equations for correlation of opercula diameter with dry weight (W = 0/49 L, Re= 14) and ash free dry weight (W = 0/16 L, Re = 18/8) for this species were calculated.

journal of life sciences

The Comparison of the Balanus improvises (Crustacea: Cirripeia) Growth, Population Dynamics and Larval Recruitment in the Southern Coasts of the Caspian Sea