POPULATION DYNAMICS OF PARAMETERS AND THE SIZE OF THE FIRST GONADE MATURITY ON JAVA BARB (BARBONYMUS GONIONOTUS) IN PONDOK RESERVOIR, EAST JAVASiti Nurul Aida, Moh. Rasyid Ridho3 Edward Saleh and Agus Djoko Utomo
The Pondok Reservoir has an area of 407 hectares located in Ngawi Regency, East Java Province. Java Barbs in Pondok Reservoir still dominates but the trend of the percentage of catches decreases every year, while introduced fish such as Tilapia tend to rise. Information on population dynamics of Java Barbs (Barbonymus gonionotus) is needed as input for sustainable fisheries management. This study aims to analyze the parameters of the population dynamics of Java Barbs in the Pondok reservoir, East Java. The method of collecting length frequency data is carried out every month starting from January to November 2020, data analysis was assisted by using the FISAT II package program. The results showed that the length of the first gonad maturity of Java Barbs in Pondok reservoir was 23.9 cm. Growth parameters of infinitive length (Lâ) = 29 cm, growth coefficient (K) = 0.55/year, and Barbâs growth equation is Lt = 29 (1-e -0.55 (t+0.29844)). Natural mortality parameters (M) = 1.25/year, fishing mortality (F) = 2.45/year, total mortality (Z) = 3.70/year, and exploitation rate (E) = 0.7.