Some population parameters of the common carp (Cyprinus carpio, 1758) in Lake Paniai, Papua

Common carp (Cyprinus carpio) is known as introduced fish on some lakes in Indonesia and included in herbivore fish. The common carp population in Lake is the dominant number, so that it's become at of fishing target. Estimation of some parameters of common carp population in Lake Paniai was aimed to evaluate the growth parameters, mortality, the fishing rate and recruitment pattern. Collecting and measuring the fish sample was done in the period from February to October 2016 by using the fishing gear of gill nets with mesh sizes of 1.00 - 4.50 inches. The results showed that common carp population in Lake Paniai was dominated by individual lengths between 15-25 cm with a frequency of 55.78%, the growth pattern of male fish was allometric (-) and females were isometric. Asymptotic length (L∞) = 61.43 cm and the growth coefficient (K) = 0.32 per year. The rate of natural mortality (M) = 0.65 per year, the fishing mortality rate (F) = 0.52 per year, the total mortality rate (Z) = 1.17 per year and the exploitation rate (E) = 0.44. The exploitation rate of common carp fish was still below the optimum value, thus an attempt to catch this fish, could be still improved. Common carp populations caught by mostly fishermen have had a chance to spawning thus common carp fish population in the lake was estimated to still be preserved and could be utilized in a sustainably. Peak recruitment occurred only once in a year, namely in June.