BEBERAPA ASPEK BIOLOGI IKAN NILEM (Osteochillus vittatus) DI DANAU TALAGA, SULAWESI TENGAH

Abstract

ABSTRAKIkan nilem (Osteochillus vittatus) merupakan ikan introduksi di Danau Talaga, Kabupaten Donggala, Sulawesi Tengah. Studi tentang biologi populasi suatu spesiesakan membantu dalam memahami pengelolaannya. Penelitian ini bertujuan untuk mengetahui beberapa aspek biologi ikan nilem (Osteochillus vittatus)sebagai informasi dasar dalam langkah pengelolaan sumberdaya ikan di Danau Talaga. Penelitian ini dilaksanakan pada bulan Maret, Mei, Juli dan Oktober Tahun 2013. Sampel ikan nilem diperoleh dengan melakukan percobaan penangkapan menggunakan 2 set jaring insang (ukuran mata jaring 1, 1½, 2, 3 dan 4 inci). Ikan yang didapat, diukur panjang total (cm) dan beratnya (g). Pengamatan isi perut dan gonad dilakukan di laboratorium Biologi Ikan, Balai Penelitian Pemulihan dan Konservasi Sumberdaya Ikan.Ikan nilem merupakan ikan yang dominan tertangkap di Danau Talaga dengan kisaran ukuran panjang antara 11-22,7 cm dan ukuran berat antara 15,79 -171,43 g, dimana ikan dengan kelompok panjang antara 14-15 cm mendominasi tangkapan. Pola pertumbuhan ikan nilem bersifat alometrik negatif. Ikan nilem dikategorikan sebagai ikan herbivor dengan makanan utamanya adalah tumbuhan. Ikan nilem yang dominan tertangkap berada pada tingkat kematangan gonad (TKG) IV, dimana ukuran pertama kali matang gonad (L m ) baik jantan atau betina lebih kecil dibandingkan L m ikan nilem pada beberapa referensi. Hal ini mengindikasikan bahwa ikan nilem di Danau Talaga matang gonad pada ukuran yang lebih kecil. Tipe pemijahan ikan nilem di Danau Talagaadalah total spawner dan dapat memijah sepanjang tahun. KATA KUNCI: Nilem, makanan, pola pertumbuhan, kematangan gonad, tipe pemijahan, fekunditas ABSTRACT Bonylip barb (Osteochillus vittatus) was one of introduction fish species in Sulawesi waters, including LakeTalaga, Donggala,Central Sulawesi. Study on biology populationof species will assist in understanding ofits management. The aim of this research is to know some biological aspects of bonylip barb as basic information in fish resource management of Lake Talaga. The researchwas conducted on March, May, July and October 2013. The fish samples werecaptured by 2 sets experimental gillnet(mesh size 1, 1½, 2, 3 and 4 inch). These samples then measured its length and weight. The stomach content and gonad was observed at biological laboratory of Research institute for Fisheries Enhancement and Conservation. Bonylip barb is a dominant fish at Lake Talaga with the length range between 11-22.7 cm and weight range between 15.79 -171.43 g. The fishes with the length group 14-15 cm were dominatedin fish catch. Bonylip barbwas an herbivore fish with plants as the main food. Thefish with stage IV of gonadsmaturitywere dominated, with the first length of maturity (Lm) inLake Talagawas smaller than other references, either male or female fish.It was indicatedthat in Lake Talaga, bonylip barb fishwas matured in smaller size. Thebonylip barb is a total spawner and the spawning period of it may occurred throughout the year.

Morphoregression and Reproduction Aspect of Bonylip Barb (<I>Osteochilus vitattus</I> Valenciennes, 1842) in Tamblingan Lake, Bali Island

“…Bonylip barb in Tamblingan Lake spawned throughout the year; this was evidenced by the constant finding of male and female on gonad maturing every month of observation. Similar conditions were also found in Telaga Lake (Putri et al, 2015). The mature fish were also found in all sampling stations.…”

“…The length at first maturity of bonylip barb in Tamblingan Lake was 116 mm TL. That length was longer than bonylip barb in Rawa Pening Lake (Rochmatin et al, 2014), but shorter than bonylip barb in Singkarak Lake (Uslichah and Syandri, 2003) and Telaga Lake (Putri et al, 2015). The factors that determine the length at first maturity is the environmental condition (Pérez-Palafox et al, 2022), food availability (Karna and Panda, 2011), and the growth somatic factor (Kılıç and Becer, 2016).…”

“…Based on the reproductive strategy, the bonylip barb fish in Tamblingan Lake is developed with the R Strategy (Reznick et al, 2002). The fecundity of bonylip barb in Tamblingan Lake is greater than of bonylip barb in Telaga Lake (Putri et al, 2015), Rawa Pening (Rochmatin et al, 2014), Singkarak Lake (Syandri et al, 2015) and in Sidenreng Lake (Omar, 2010). The fecundity of bonylip barb in Tamblinan Lake is greater because the length and weight is bigger than the previous research.…”

Biological Aspects of Waanders’s Hard-lipped Barbs (Osteochilus waandersii) in Tambatan River, North Sumatera, Indonesia

“…A similar condition was also found by Rochmatin et al (2014) in the Pening swamp, Semarang, with the b value of 2.8392. A study conducted by Putri et al (2015) in Lake Telaga, Central Sulawesi, resulted in a b value of 2.838 and a negative allometric growth pattern. Meanwhile, Rochmatin et al (2014), conducted a study on the Rawa swamp, Semarang, resulting in a b value of 2.839 and a negative allometric growth pattern.…”

Biological Aspect of Betta raja of Wild Type at Bandar Tinggi Village

“…Research related Aspects of fish biology ever conducted (Simanjuntak, 2015); (El-Kasheif et al, 2015); (Putri et al, 2015). The study of the biological aspects of B. raja to date has not been a report in Indonesia.…”