Abstract
Growth Rate and Condition of Vimba, Vimba Vimba (Actinopterygii: Cypriniformes: Cyprinidae), a Species Under Restitution in the Odra River Estuary
Highlights
The majority of European populations of vimba, Vimba vimba (L.), have been classified into increasing categories of conservation status while Polish populations of this fish are classified as critically endangered species (CR) and they are facing extinction
The condition of the fish was described with the use of the Fulton (K) and Le Cren (Lc) formula (RitterbuschNauwerck 1995, Bolger and Connolly 1989)
According to Bontemps (1971), in the catchment of the total amount of the fresh water fish. They were 9.0 to 19.9 t in the Szczecin Lagoon, while in the Odra mostly caught in the Gulf of Gdańsk, the Pomeranian Bay, River and the Warta River it ranged from 7.7 to 12.5 t the Szczecin Lagoon, and the Odra River
Summary
The majority of European populations of vimba, Vimba vimba (L.), have been classified into increasing categories of conservation status while Polish populations of this fish are classified as CR (critically endangered) and they are facing extinction. Monitoring some biological parameters of the population such as the rate of growth (increase in mass and length), age structure, sex structure, and condition nay help to evaluate the success rate of the restitution efforts. 210 individuals of vimba, caught in the waters of the southern part of the Odra River estuary, mainly in Lake Dąbie, between 28 May 2007 and 30 June 2008 were studied as to their age, condition, rate of growth in mass and length. The mean standard length and mass of the vimba fish studied were 306.33 mm and 286.02 g, respectively. The annual increase in length of the fish approximated 20 mm, being the most intense in the first two years of life (23–24 mm). Analysis of back readings and empirical results proved that the growth of vimba was best approximated by the von Bertalanffy model. Comparative analysis of condition coefficients of the population of vimba in the Odra River estuary and other populations showed that the condition of analysed vimba population in individual years of live was lower
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