Journal of Marine Biology

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Growth parameters, natural mortality and biomass of Cor Venus, Paphiacor were studied in Gassir, Bushehr shoreline areas (from 50˚ 40´ E and 29˚ 14´ N) during September 2008 - 2009. Samples were obtained at bimonthly from Gassir area in a year at low tide. Some transects were selected at random direction and at the zigzag pattern, so that cover all of the shell beds. In each transects one or two sampling quadrat (0.25 m2) was placed random. The length frequency of samples was measured bimonthly, from dextral to sinistral with vernier calipers to the nearest 0.1 millimeter. The length frequency was used to estimate growth and natural mortality parameters. Data analysis was conducted with the most recent version of LFDA statistical software. Stock abundance was estimated in the cold, temperate and hot months of the year.Salinity and water temperature were measured and averaged in the sampling months. Surface sediment samples (0-20 cm depth) were collected from sampling area inhabited by the P. cor.The Von Bertalanffy growth parameters for Paphiacor were estimated as K=0.8Year-1, L¥ = 55 mm and t0 = -0.45. Estimated natural mortality rate for Paphiacor was M = 0.57 and the maximum ages (Tmax) were calculated during 50 months. The mean of abundance of this species was 8.8±2.2 shells per quadrat and with a maximum in February (Bahman) and minimum in November (Abban). The mean of salinity and water temperature was 41.3 psu and 25.2ºC, respectively. More than 88 percent of the bottom sediment in the studied area was included of silt (54.60%) and sands (32.74%).Present results show, two factors, temperature and sediment types affected on the growth and existing of P. cor in the studied area.

Keywords: Stock Assessment, Cor Venus, Paphia Cor, Bushehr, Persian Gulf

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