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All Journal Biodiversitas Journal of Biological Diversity
KRISMONO KRISMONO
Research Institute for Fisheries Enhancement, Ministry of Marine Affairs and Fisheries. Jl. Cilalawi No. 1, Purwakarta 41152, West Java, Indonesia
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology

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Genetically continuous populations of Striped Snakehead (Channa striata) in the Cingcingguling River fragmented by Sempor Reservoir, Central Java, Indonesia NUNING SETYANINGRUM; W. LESTARI; KRISMONO KRISMONO; Agus Nuryanto
Biodiversitas Journal of Biological Diversity Vol. 23 No. 1 (2022)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d230128

Abstract

Abstract. Setyaningrum N, Lestari W, Nuryanto A. 2022. Genetically continuous populations of Striped Snakehead (Channa striata) in the Cingcingguling River fragmented by Sempor Reservoir, Central Java, Indonesia. Biodiversitas 23: 222-230. Cingcingguling River, located in Kebumen District, Central Java Province, Indonesia. The Sempor Reservoir fragments it. The previous study proved the negative impact of the reservoir on positive rheotaxis fish, mainly in genetic constituents between the reservoir and river populations. However, research has not been conducted on the negative rheotaxis fish, such as Channa striata. Assessing population genetic and taxonomic validity study of Striped Snakehead in the Cingcingguling River is an essential effort. Both studies could be done using the cytochrome c oxidase 1 gene. Therefore, this research aims to determine taxonomic status and evaluate the population genetic of C. striata in the Cingcingguling River. The samples were collected at eight sites, inside and outside the reservoir. The used marker was sequenced from 53 individuals, and all specimens showed high identity (98.67% to 100%) and low genetic distances (0.00 to 0.01) to C. striata (KU692421, KU852443, and MG438366). Those values proved that all samples were genetically identified as Channa striata. The vertical genetic distribution analysis demonstrated that C. striata populations are genetically not different along the river. Unlike rheotaxis positive fish phenomena, the reservoir's existence does not cause genetic fragmentation and leads to continuous striped snakehead populations.
Exploitation of striped snakehead (Channa striata) in Sempor Reservoir, Central Java, Indonesia: A proposed conservation strategy Nuning Setyaningrum; Windiarini Lestari; Krismono Krismono; Agus Nuryanto
Biodiversitas Journal of Biological Diversity Vol. 23 No. 7 (2022)
Publisher : Society for Indonesian Biodiversity

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/biodiv/d230735

Abstract

Abstract. Setyaningrum N, Lestari W, Krismono, Nuryanto A. 2022. Exploitation of striped snakehead (Channa striata) in Sempor Reservoir, Central Java, Indonesia: A proposed conservation strategy. Biodiversitas 23: 3584-3592. Striped snakehead (Channa striata) has important economic value in freshwater systems, including Sempor Reservoir in Indonesia, where increases in catch sizes have resulted in a declining population. In this study, we determined its population size based on abundance and distribution of length and assessed the rate of exploitation based on estimated growth and mortality rates to determine a conservation strategy in Sempor Reservoir. The study was undertaken from March to October 2020. The method used was a purposive random sampling survey. Fish samples were taken from five stations with different land uses. The estimated growth, mortality, and exploitation rates were analyzed by Pauly's model using FISAT II. Channa striata abundance data were analyzed using a Kruskal-Wallis test. The results showed that the highest abundance of C. striata at the KW station was almost three times higher than at the BK station. The average size of the gonads at first maturity was 277.4 mm in females and 284 mm in males. The estimated growth parameters indicated an asymptotic length (L?) of 409.5 mm. An exploitation rate of 0.74 was classified as overfishing. The proposed conservation strategy is to limit the number of catches by as much as 44% and prohibit the catching of individuals with a length of 230-349 mm. Kedungwringin Station was defined as a reference area with the largest abundance and complete size distribution, namely, the pre-reproduction, reproduction, and post-reproduction stages. Bangkong Station was defined as a spawning ground because there were many fish in the reproductive stage and Sempor River Station was the nursery ground with mostly juvenile fish. These two sites must be protected for sustainable striped snakehead populations in the river and reservoir.
Co-Authors Agus Nuryanto Agus Nuryanto Nuning Setyaningrum NUNING SETYANINGRUM W. LESTARI Windiarini Lestari