Ikan gabus (Channa striata) merupakan salah satu jenis ikan air tawar yang bernilai ekonomis tinggi. Potensi biologi ikan gabus yang tahan terhadap kondisi perairan yang kurang baik merupakan peluang untuk dikembangkan menjadi komoditi budidaya perikanan. Selain potensi biologi yang baik, ikan ini juga memiliki potensi bisnis yang sangat menjanjikan. Ikan ini selain dijadikan lauk pauk dalam bentuk segar, banyak produk olahan pangan menggunakan ikan gabus sebagai bahan baku olahan. Sekarang ikan gabus juga dijadikan bahan baku farmasi, karena kandungan albuminnya yang tinggi. Dengan keunggulan aspek biologi dan ekonomi, pembenihan ikan gabus memiliki prospek untuk menghasilkan benih yang akan digunakan untuk restoking sebagai upaya meningkatkan populasi ikan gabus di alam dan juga benih untuk kegiatan budidaya.
AbstrakPenetasan telur ikan merupakan hasil dari embriogenesis hingga embrio keluar dari cangkangnya. Aktivitas embrio dipengaruhi oleh faktor dari luar dan dalam cangkang. Salah satu faktor dari luar yaitu pH air. Tujuan dari penelitian ini adalah untuk mengetahui derajat penetasan dan lama waktu menetas telur ikan betok (A. testudineus) yang diinkubasi pada media dengan pH berbeda. Penelitian ini telah dilakukan di Laboratorium Budidaya Perairan, Program Studi Budidaya Perairan, Fakultas Pertanian, Universitas Sriwijaya. Metoda penelitian menggunakan rancangan acak lengkap (RAL) dengan lima perlakuan dan tiga ulangan P1 (pH 5±0,2), P2 (pH 6±0,2), P3 (pH 7±0,2), P4 (pH 8±0,2) dan P5 (pH 9±0,2). Parameter yang diamati yaitu persentase telur menetas, lama waktu penetasan dan parameter kualitas air. Hasil penelitian menunjukkan bahwa pada pH 7±0,2, pH 8±0,2 dan pH 9±0,2 memberikan hasil persentase telur menetas dan lama waktu penetasan telur yang tidak berbeda nyata.AbstractThe hatching of fish eggs is the result of embryogenesis until the embryo out from the shells. Embryos activities are influenced by external and internal factors. One of the external factors is the Power of Hydrogen (pH). The purpose of this study is to determine the hatching rate and incubation time of climbing perch (Anabas testudineus) incubated on different pH of the medium. The research had been conducted in Aquaculture Laboratory, Department of Aquaculture, Agriculture Faculty, Sriwijaya University. The research method used a completely randomized design with five treatments and three replications. The treatments were P1 (pH 5±0.2), P2 (pH 6±0.2), P3 (pH 7±0.2), P4 (pH 8±0.2) and P5 (pH 9±0.2). Parameters that had been observed were the eggs percentage of hatching, incubation time and water quality parameters. The results showed that pH 7±0.2, pH 8±0.2 and pH 9±0.2 have no significant difference on hatching percentage and incubation time of climbing perch.
The purpose of this study is to investigate fish biodiversity in the Kelekar floodplain. The study is explorative, with the determination of observation stations and with purposive sampling methods. Fishes were captured approximately 1.509 individuals consisting of 17 families and 24 species. The Shannon-Weiner diversity index was 2.394; 2.691; and 2.183 for station 1, 2, and 3, respectively. The Evenness index was 0.764; 0.871; and 0.806 for station 1, 2, and 3, respectively, meanwhile the highest value of Simpson’s dominance index was 0.045. The biodiversity index of the three stations was in the medium category.
Asian Redtail Catfish (Hemibagrus nemurus) is highly economic important catfish in South Sumatra. Investigating DNA authentication is of importance for species conservation and breeding selection. Cytochrome C Oxidase subunit I is one of mitochondrial DNA markers used for species barcoding in freshwater, brackishwater and marine fish. This research aims to explore the use of COI gene for species barcoding, constructing phylogenetic tree of Asian Redtail Catfish (ARC). The methods used in the research consisted of DNA extraction, PCR (Polymerase Chain Reaction) amplification and sequencing mtDNA COI gene of ARC obtained from Musi and Penukal Rivers (South Sumatra). A 572 and 596 base pairs of partial coding sequences were obtained representing each river. Phylogenetic analyses indicated that ARC was at the same cluster from Bagridae family, and different cluster from others catfish, Pangasius sp and Oreochomis niloticus. Further study using more species of Bagridae and habitat are needed to investigate the diversity of DNA from South Sumatra water resources
Highlight Research Sex reversal for orange-spotted grouper Epinephelus coioides The application of 17α-methyltestosterone induce sex change The stability of sex change need more investigation Abstract The occurance of hermaphrodites in grouper fish causes a scarcity of male parents, so an alternative is needed to accelerate sexchange to male at a young age. The present study was expected to scrutinize the mechanisms of sex-change in fish in the early change process, and whether the testis converted from immature ovary using 17α-methyltestosterone (MT) would recover after the termination of MT treatment. MT-induced sex-change and 5-aza-2’-deoxycytidine (5-Aza) were connected as DNA methylation inhibitors to comprehend the alternation of gonadal soma cells. The orange-spotted groupers were used at the developmental ages and fed a diet containing MT at 50 mg/kg for three months and then a normal diet for a month. In the first week and second week fish injected with 5-Aza intraperitoneally during the MT-oral administration. Most of the fishes in the control group had immature ovaries, but all the females fed with MT, had immature spermatogenesis. However, one month after the withdrawal of MT treatment, the sex of the fish returned to female-like even though the fish have undergone MT-induced masculinization. This outcome demonstrates precocious sex-change from under yearling, orange-spotted grouper utilizing oral MT treatment is impermanent. All the females of 5-aza treatments showed no spermatogenic cells. In this study, lower growth rates were demonstrated by the MT-treated groups. The impact of this metabolic change was clear after the end of the hormone oral administration since the decreased growth of the groups treated for three months.
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