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Coral Reef Health Index On Sangiang Island Rahma Aprilian; Dietriech Geoffrey Bengen; Erlania Erlania; Ofri Johan; Idris Idris
ILMU KELAUTAN: Indonesian Journal of Marine Sciences Vol 26, No 4 (2021): Ilmu Kelautan
Publisher : Marine Science Department Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/ik.ijms.26.4.271-281

Abstract

The coral reef is massive deposits of calcium carbonate produced from coral animals that are symbiotic with zooxanthellae. One of the activities carried out as an effort to improve the sustainability of coral reefs is monitoring the health condition of coral reefs. The coral reef health index value is based on benthic components and fish components. The benthic component consists of variable life coral cover and the level of coral reef resilience determined based on macroalgae, rubble, and life coral. Fish component is the total biomass of target reef fish. The highest coral reef health index value is at value 10 and the lowest value is at value 1. This study aimed to determine the value of the health index on Sangiang Island. This research was conducted on 16-18 February 2019 on Sangiang Island on three dive stations are Legon Bajo, Legon Waru, and Tembuyung. Data collection of benthic components uses the Underwater Photo Transect (UPT) method and data collection of fish components uses the Underwater Visual Census (UVC) method. The results showed that the coral reef health index on Sangiang Island was at values 6 and 5, means the live coral cover on Sangiang Island was included in the high and medium category, and the level of coral reef resilience or recovery potential was included in the high category, while the total biomass of the target reef fish is still in the low category, only a few species of fish were found that belong to the target reef fish.
KERAGAMAN JENIS IKAN HIAS DAN KONDISI PERAIRAN DI KESATUAN HIDROLOGIS GAMBUT SUNGAI MEMPAWAH-SUNGAI DURI, KALIMANTAN BARAT Muhamad Yamin Paada; Tuti Kadarini; Rendy Ginanjar; Ofri Johan; Mochamad Zamroni; Siti Zuhriyah; Idil Ardi
Jurnal Riset Akuakultur Vol 16, No 4 (2021): (Desember, 2021)
Publisher : Pusat Riset Perikanan, Badan Riset dan Sumber Daya Manusia Kelautan dan Perikanan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (97.38 KB) | DOI: 10.15578/jra.16.4.2021.245-253

Abstract

Perairan rawa gambut menyimpan potensi ikan hias yang unik dengan keragaman jenis yang berbeda dibanding ikan yang hidup di perairan air tawar lainnya. Karena terbiasa hidup pada kondisi fisik kimia air yang tidak biasa, menyebabkan banyak jenis ikan hias dari perairan rawa gambut belum dapat dipijahkan dan masih mengandalkan penangkapan dari alam. Di sisi lain, kelestarian beberapa jenis ikan hias rawa gambut menjadi terancam karena banyak yang dikonversi seperti Kesatuan Hidrologis Gambut (KHG) Sungai Mempawah-Sungai Duri di Kabupaten Mempawah, Kalimantan Barat. Kegiatan ini bertujuan untuk mengetahui jenis ikan hias dan karakteristik habitat di KHG Sungai Mempawah-Sungai Duri, Kabupaten Mempawah, Kalimantan Barat. Informasi yang didapat akan menjadi dasar untuk melakukan rekayasa lingkungan dalam adaptasi dan domestikasi ikan dari perairan lahan gambut. Penelitian dilakukan pada saluran irigasi buatan yang terdapat di lahan perkebunan sawit di daerah Sebukit dan Sawit. Penangkapan dilakukan menggunakan jaring, pancing, bubu, dan seser yang diberi umpan pakan pelet. Namun hanya seser dan bubu yang menghasilkan tangkapan ikan. Dari hasil uji coba penangkapan dan penjeratan diperoleh ikan hias di antaranya Puntius rhomboocellatus, Rasbora trilineata, Desmopuntius johorensis (Duncker, 1904), Rasbora dorsiocellata, sepat (Trichogaster sp.), dan Rasbora cephalotaenia. Karakteristik perairan di wilayah tersebut di antaranya kecepatan aliran sangat lambat (tergenang), pH asam (pH 3-4), kelarutan oksigen sedang (2-3 mg/L), dan berwarna merah hitam seperti teh dengan kecerahan sekitar 20 cm. Di bagian pinggir perairan terdapat rumput-rumputan yang hidup menjorok ke perairan dan menjadi habitat ikan. Hasil penelitian ini menggambarkan bahwa keragaman ikan di daerah ini cukup rendah dan didominasi Puntius rhomboocellatus dan Rasbora cephalotaenia.Peat swamp waters (black water) usually have diverse, unique, and attractive fish species, which often have the potential as ornamental fish. However, due to the uniqueness and adaptation to the water quality condition, black water fishes’ culture, and breeding technology have not yet been fully understood, resulting in reliance on wild capture. On the other side, many of the peat swamp areas were converted to palm plantations such as Peatland Hydrology Unitary (KHG) Mempawah River-Duri River, West Kalimantan. This study aimed to build a biodiversity inventory of ornamental fish species and their habitat characteristics in the peat waters of Peatland Hydrological Unit (KHG) of Mempawah River-Duri River, West Kalimantan. The information obtained serves as baseline information for environmental engineering to adapt and domesticate ornamental black water fishes. The study was conducted in two irrigation channels located on oil palm plantations of the Sebukit and Anjongan-Sawit. These locations are on peat swamps areas and were once a habitat for different black water fishes. The fish samples were caught by hand net, cast net, angler, trap using artificial bait or pellet. Only the hand net and fish trap were successful in capturing the fish. The fish caught included Puntius rhombocellatus, Rasbora trilineata, Desmopuntius johorensis (Duncker, 1904), Rasbora dorsiocellata, Trichogaster sp., and Rasbora cephalotaenia. The water condition of the locations was characterized by very slow-moving water mass (<1 m/minute), acidic (pH 3-4), moderate dissolved oxygen (2-3 mg/L), and typical black water brightness (± 20 cm). Overgrown bushes and grasses along the channels are the natural habitats of these species. This study concludes that the diversity of fish in this area is relatively low and dominated by P. rhomboocellatus and R. cephalotaenia.