Guppy fish (Poecilia reticulata Peters) population structure in Gajah Putih River, Surakarta, Central Java

Abstract

Panjaitan YK, Sucahyo, Rondonuwu FS. 2016. Guppy fish (Poecilia reticulata Peters) population structure in Gajah Putih River, Surakarta, Central Java. Bonorowo Wetlands 6: 103-109. The study of fish population structure is one strategy to know the condition of fish population and water pollution level in a waters area. Guppy fish (Poecilia reticulata Peters) can live in various conditions of water quality, especially in rivers. The Gajah Putih River flowing through Surakarta, Central Java is the habitat of guppy fish. The number of residential and factory activities that dump waste into the Gajah Putih River, causing a decrease in river water quality. Research on the population structure of Guppy fish in Gajah Putih river, Surakarta City was conducted between September and December 2014. Sampling was done purposively where the Guppy fish was found. There are 10 locations along the Gajah Putih River for sampling, each 300m away. At each location, a random sample of 30 fish was collected, then sorted by age and sex. There are also measurements of energy reserves in fish samples, as well as physical and chemical factors of water. Based on temperature, DO, pH TS and COD, the environmental conditions of the Gajah Putih River waters can still be tolerated by Guppy fish. The difference of environmental parameters between stations is relatively small, so it does not affect the difference of population structure of Guppy fish between stations.