POPULATION OF Osteochilus spp. AS A BASE OF SUSTAINABLE FISHING IN SERAYU RIVER
Abstract: The increasing
demand for freshwater resources generated by human population growth,
urbanization, industrialization and irrigation have resulted in a decline or
loss of freshwater fish such as Osteochilus spp. The aims of research were to
analysis the population of Osteochilus spp in terms of abundance, longitudinal distribution
and sex ratio
and to determine
environmental factors of
river driven these populations. The research was carried
out at upper part of Serayu River during wet season (January – March) and dry
season (June - August) 2007. Fishes were collected by using electro fishing and
stratified random sampling was applied by dividing this river into five strata
based on altitude. The results showed that the total abundances of Osteochilus
spp. was 149 individuals and composed by O. hasselti (47) with 8.30 – 24.35 cm
and 11.20 – 198.70 g, O. microchephalus (101) with 11.35 – 25.21 cm and 17.9 –
206.5 g and O.kahajanensis (1) with 17.30 cm and 68.80 g. The size of
population O. hasselti and O. microchephalus gradually increased from 7 and 4
individuals in stratum A became 27 and 12 individuals in stratum D, and then
increased up to 43 and 17 individuals in stratum E. The sex ratio of O.
hasselti was 10:16 and O. microchephalus was 20:23. Both species were
longitudinally distributed in Serayu River. It seems that the population of O.
hasellti and O. microchephalus were more influenced by physical factors such as
depth and current rather than chemical factors i.e. DO and pH at Serayu River.
Author: Windiarini Lestari, Yogi
Putranto, Nuning Setyaningrum1 and Sugiharto
Journal Code: jpperikanangg090013

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