Mortality Ratio and Stock Analysis of Vimba (Vimba vimba tenella (Nordmann,1840)) Population in Karacaoren I Dam Lake (Burdur- Turkey)

In this study, 808 vimba (Vimba vimba tenella (Nordmann, 1840)) individuals were captured during October 1996- April 1998 from Karacaoren I Dam Lake and mortality ratio and stock size were estimated. Age distribution of V. v. tenella varied from 0- VII and 73.51 % of the observed samples were belonging to I- II age group. The fork length was ranged between 11.7- 27.8 cm. The growth parameters of vimba population were found as L = 43.39 cm, K = 0.0863 and to = -4.7615. The mortality rates of vimba, according to constant parameter system were calculated as; Z=0.71 y -1 , M = 0.27 y -1 and F = 0.44 y -1 . The survival rate of the Vimba is determined as 49.16 %, exploitation rate as 62 %. Mean number and mean biomass of fish in population, bigger than 18 cm length, have been estimated as 762328 and 95044 kg respectively. With the simulations of fishing mortality rates belong to each length group, it was determined that maximum sustainable yield (MSY) could be obtained with increase 40 % increase of the present effort.