Biologi Reproduksi Ikan Brek (Barbonymus balleroides Cuvier & Val. 1842) Di Sungai Serayu Kabupaten Banjarnegara Provinsi Jawa Tengah
Abstract
The Serayu River, a major river in Central Java Province, crosses five regencies including Banjarnegara Regency. In Banjarnegara, there was built a reservoir called Panglima Besar Jenderal Soedirman Reservoir. The reservoir construction caused habitat fragmentation which splits Serayu River into two different ecosystems, running water ecosystem and stagnant water ecosystem. Inderectly the habitat fragmentation affects the species existence of fish that lived in the reservoir. Barb is one of the fish species, which found in the Serayu River tends to decrease in population. The aims of this study are to examine reproduction aspects and alternative management of barb in Serayu River. The fish samples were taken from October 2012 to March 2013 in three zones (downstream, middle stream, and upper stream of Jenderal Sodirman reservoir), consisting of 6 stations. Fish samples were caught using nets, gill nets and electrofishing. The samples were analyzed to find out the length, weight, sex ratio, gonad maturity index, fecundity, egg diameter and egg quality. The barbs were caught 1,358 consisted of 642 males and 716 females, with total length varied in the range between 58-245 mm and weight range between 2- 155 g. The most of fish captured were obtained in the upstream zone, consisted of 233 males and 239 females. The growth pattern of male and female fish was a positive allometric. The sex ratio during the study was 1:1.12. Male barb reached first gonad maturity at a size of 152 mm while female fish 169 mm. Based on gonad maturity stage and a peak gonad maturity index, the spawning occurred in October. The fecundity of barb was about 2,760-25,290 eggs and the barb fish as a total spawner. The highest percentage of eggs quality in barb was protein and then followed by fat and carbohydrate respectively. Based on the analysis result, amino acid, and glutamic acid had the highest percentage. Habitats fragmentation influenced barb reproduction.
Collections
- MT - Fisheries [2941]