Perikanan Tangkap Di Danau Matano, Mahalona, Dan Towuti, Sulawesi Selatan

Abstract

Suatu penelitian untuk mengetahui aspek perikanan tangkap di Danau Matano, Mahalona, dan Towuti telah dilakukan dari bulan Mei Desember 2005. Danau Matano, Mahalona, dan Towuti merupakan contoh dari ekosistem danau tektonik yang menampung jenis ikan endemik dan juga jenis ikan introduksi (tilapia dan ikan mas, Cyprinus carpio). Penelitian ini dilakukan dengan metode survei dengan cara mencari lokasi-lokasi ada aktivitas penangkapan ikan, wawancara dengan nelayan, dan bekerjasama dengan enumerator dalam mengumpulkan data penelitian. Hasil penelitian telah mendapatkan 22 jenis ikan endemik dan 6 jenis ikan introduksi yang tertangkap di ketiga danau (Matano, Mahalona, dan Towuti). Danau Matano tertangkap 7 jenis ikan endemik, Mahalona 8 jenis, dan Danau Towuti tertangkap 15 jenis. Jaring dan bagan merupakan alat tangkap yang dominan digunakan oleh nelayan untuk menangkap ikan endemik seperti ikan buttini (Glossogobius sp.) dan pangkilan (Telmatherina sp. dan Paratherina sp.). Hasil tangkapan ikan di Danau Towuti 5,7 kg per ha per tahun, Danau Mahalona 1,8 kg per ha per tahun, dan Danau Matano 1,2 kg per ha per tahun. Untuk melestarikan ikan-ikan endemik perlu ada pengelolaan dan pengaturan waktu dan lokasi penangkapan yang baik. A research in order to identify the capture fishery at Lakes: Matano, Mahalona, and Towuti was conducted from May to December 2005. Lakes Matano, Mahalona, and Towuti are examples of the representative tectonic lake ecosystems housing the endemic and some exotics (tilapia and carp, Cyprinus carpio) fish species. The survey methods were used in this reseacrh by hunting the location of fishing activities, interview with fishermen and partnership with enumerator in collecting research data. Results of the research show that 23 endemic fish species and 6 introduced per exotic fish species were caught in three research lakes. From 22 endemic fishes, 7 fish species were caught at Lake Matano, 8 fish species at Lake Mahalona, and 15 fish species were caught at Lake Towuti respectively. Gillnets and bagan were dominant fishing gears to catch the endemic fishes such as buttini (Glossogobius sp.) and pangkilan (Telmatherina sp. and Paratherina sp.). The productivity of the fisheries were 5.7 kg per ha per year for Lake Towuti, 1.8 kg per ha per year (Lake Mahalona), and 1.2 kg per ha per year (Lake Matano) respectively. To sustain endemic fishes is needed a better management eg. domesticating and regulating time and location of capture endemic fish species.

Mapping of Chl-a in Indonesia’s Five Priority Lakes uSing Linear Regression (Case Studies: Lake Singkarak, Toba, Maninjau, Matano, and Towuti)

“…The range of Chl-a on implementation of the algorithm is in the range of 0.1 to 0.8 mg/m 3 shown in Figure 9b. This is strengthened by previous research conducted by [10] which produced similar estimated values in the range of 0 to 1 mg/m 3 . The research [10] cannot be said wrong in terms of obtaining the Chl-a estimation algorithm by combining several lakes at once, because the algorithm model used was different.…”

“…This is strengthened by previous research conducted by [10] which produced similar estimated values in the range of 0 to 1 mg/m 3 . The research [10] cannot be said wrong in terms of obtaining the Chl-a estimation algorithm by combining several lakes at once, because the algorithm model used was different. The suitability of the algorithm obtained in Lake Matano was also strengthened in the research [30] which also presented the results that C10's algorithm can be used to estimate Chl-a concentrations in the southern part of Lake Chad with good accuracy with the Chl-a range of Lake Chad between 0 to 1 mg/m 3 .…”

“…The size value can be used if the NMAE value is below 30% [8]. The following is an algorithm used to test a model algorithm to determine whether the model algorithm model is good or not [10].…”

“…This metric provides easy-to-interpret results on model performance, which is symmetrical and avoids the fallacy driven by low values of the observed quantity [9]. Previous research [2], [10], [11] conducted on several lakes separated by land produced one algorithm model, which raises the question that could arise is whether the resulting five-lake algorithm model is better than the one-lake-location algorithm model. Thus, this research aims to develop an estimated Chl-a algorithm for accelerating and facilitating Chl-a routine monitoring based on Landsat data.…”

Growth Patterns Analysis of Yellow-Finned Medaka (Oryzias profundicola) as Endemic Fish in Lake Towuti

“…Only the taxonomic status and description [8] phylogenetic analysis and taxnomic [9], and Ichthyofauna of the endemic fish in Lake Towuti [10], [11] IOP Publishing doi:10.1088/1755-1315/1118/1/012047 2 Yellow-finned medaka in Lake Towuti was threatened with extinction due to the intensive and excessive exploitation and it's not environmentally friendly, this is evidenced by the number of operating lift nets are 30 pieces. Apart from the level of intensive and excessive exploitation, the cause of the decline in the population of medaka fish in Lake Towuti is the invasive fish that dominate the waters, namely Oreochromis mossambicus and Cyprinus carpio [13]. However, other invasive fish species were Anabas testudineus, Trichogaster pectoralis, Channa striata, and Oreochromis niloticus.…”