Inventarisasi Udang Air Tawar di Sungai Toranda, Palolo, Sigi, Sulawesi Tengah, Indonesia

Abstract

Penelitian ini bertujuan untuk mengidentifikasi udang air tawar yang terdapat di Sungai Toranda, Palolo, Sigi, Sulawesi Tengah, Indonesia. Koleksi dilakukan menggunakan electric fishing, jaring tangan, dan tangan kosong. Hasil identifikasi sampel di Laboratorium Biodiversity Fakultas MIPA Universitas Tadulako menunjukan bahwa terdapat dua spesies udang air tawar di sungai tersebut yaitu Caridina sulawesi Cai & Ng, 2009 dan Macrobrachium lanchesteri (De Man, 1911). Penemuan C. sulawesi di Sungai Toranda mengungkapkan distribusi yang lebih luas dari spesies ini, yang sebelumnya diketahui hanya terdistribusi di Maros Sulawesi Selatan dan Poboya Sulawesi Tengah. Spesies lain yang ditemukan adalah M. lanchesteri yang merupakan udang air tawar introduksi, sehingga keberadaannya di Sungai Toranda diduga terbawa secara tidak sengaja oleh kegiatan perikanan air tawar di sekitar Sungai Toranda. Penemuan kedua spesies ini merupakan laporan baru untuk Palolo Sulawesi Tengah

Notes on the distribution of Caridina sulawesi, an endemic freshwater shrimp from Sulawesi, Indonesia

“…This species was observed as sand substrate dwellers and prefer silty sand. Our finding is different from two other populations in Central Sulawesi, where they found this species in mossy and rocky substrates [8,9]. In contrast to lacustrine species, where the species composition is strongly affected by the type of substrates (hard or soft substrate) [5], riverine species of Caridina can be found in both soft and hard substrate.…”

“…Bobo natural spring has the the highest temperature with elevation only 752 m above sea level while creek in Watutau, Napu, has the lowest water temperature with highest elevation up to 1214 m above sea level. Caridina sulawesi has also been found in temperature 22 to 24 o C [8]. In the Napu site, there are also two streams nearby Watutau creek with water temperature between 15.2 to 16 o C. We found no shrimp in these sites even though we did much effort to find it, which might because this species could not tolerate the temperature below 17 o C. Temperature is one of the physical factors confining the distribution of freshwater shrimp.…”

“…In this study, Caridina sulawesi was found from both habitat in the surface water of natural spring and creeks (Table 1). Previous studies have shown this species only reported from river in both surface and subterranean water [4,[7][8][9]. The highest number of individual was obtained in Bobo natural spring, and the lowest was recorded in creek of Watumaeta Village.…”

“…For habitat description, both substrate [12] and microhabitat were recorded at each site. Coordinates and altitude of all sites in this study were taken using GPS (Global Positioning System) Garmin eTrex 10 (Garmin Ltd.) and rest sites were acquired basis on the record of specimens localities in the studies by several authors [4,[7][8][9]. The distribution map was prepared using ArcMap 10.3 based on Indonesia elevation data from DIVA-GIS (www.diva-gis.org).…”

“…Previously, the distribution of this species has only known restricted in several locations in the southern and southeast arm of Sulawesi [4,7]. Surprisingly, this species was reported from two rivers in Central Sulawesi namely Poboya (PN) and Toranda (TR) [8,9]. The recent study revealed of C. sulawesi in a small natural spring in Bobo and two creeks in Napu, Central Sulawesi.…”