Ikan padi Oryzias javanicus adalah spesies yang euryhaline, mudah dipelihara, dan dikembangbiakkan sehingga dapat menjadi ikan model untuk penelitian di laboratorium. Ikan ini juga memiliki potensi sebagai ikan hias untuk akuaskap. Budidaya ikan O. javanicus belum populer sehingga pengadaan ikan ini mengandalkan hasil tangkapan alam. Ikan liar hasil tangkapan alam membutuhkan adaptasi di dalam wadah terkontrol. Salah satu faktor yang mempengaruhi performa adaptasi awal yaitu kepadatan ikan selama pengangkutan sistem tertutup. Kondisi yang terlalu padat berdampak pada performa adaptasi ikan yang kurang baik. Oleh karena itu, penelitian ini bertujuan untuk mengkaji performa adaptasi O. javanicus selama pemeliharaan pascapengangkutan. Performa berkaitan dengan sintasan, tingkah laku, dan jumlah telur selama 15 hari pemeliharaan. Kepadatan ikan yaitu 24 ekor/L (perlakuan A) dan 40 ekor/L (perlakuan B) yang dikemas selama 6 jam. Hasil penelitian menunjukkan bahwa pengangkutan ikan O. javanicus dapat dilakukan dengan kepadatan 40 ekor/L selama 6 jam. Kepadatan tersebut menghasilkan sintasan saat pengangkutan yaitu 100%, sintasan selama pemeliharaan pascapengangkutan yaitu 92,00%, tingkah laku adaptasi yang baik, sehingga menghasilkan total telur 522 butir selama 15 hari pemeliharaan. Kata kunci: adaptasi pascapengangkutan, Oryzias javanicus, sintasan, tingkah laku adaptasi

In this research, we investigated the effects of supplementation of rice bran fermented with Effective Microorganism (EM4) on the biomass of tubifex worms cultured in the recirculation system. A Completely randomized design was made, consisting of 4 treatments and 3 replications. The experimental animals were treated with different types of feed, i.e. (A) unfermented rice bran, three times a day; (B) fermented rice bran, three times a day; (C) fermented rice bran, 5 times a day; (D) fermented rice bran, 7 times a day. They were reared in a wood box (100 × 50 × 15 cm 3 ), while a mixture of fermented rice bran and mud was applied as their growth medium. Tubifex worms were grown in the medium at a density of 100 g/m 2 , and supplemented with fermented rice bran at a dose of 500 g/box, with various frequency levels of 3, 5 and 7 times a day. Biomass of the worm and water quality was observed. As a result, we found that the addition of fermented rice bran at a rate of 5 times a day (treatment C) exhibited the greatest biomass growth, reaching up to 104,33 g/m 2 .

Penelitian ini bertujuan untuk mengetahui jenis bulu babi yang terdapat di zona pasang surut pantai Desa Bukaan Kecamatan Lakea Kabupaten Buol. Penelitian ini menggunakan tiga titik stasiun pengamatan yang masing-masing stasiun terdapat 3 transek line dan setiap transek terdapat 5 plot yang berukuran 1x1 meter. Hasil penelitian menunjukkan terdapat tiga jenis bulu babi di zona pasang surut pantai Desa Bukaan yaitu Echinometra mathaei, Deadema setosum dan Stomopneustes variolaris. Kata kunci : Inventarisasi, bulu babi, pasang surut

This study aims to determine the relationship between length and weight and condition factors of Trichopodus trichopterus in the waters of Rawa, Lakea Dua Village, Buol Regency, Central Sulawesi. The research was carried out for 2 months and took place in the swamps of Lakea Dua Village, Buol Regency, Central Sulawesi. The fish collected were measured based on the total length using a ruler in cm (1 mm accuracy), while the fish weight was measured using a digital scale with units of grams (0.01 gram accuracy). The test parameters observed included analysis of length and weight, relative weight, fulcon condition factor, and relative condition factor. The results showed that there were 53 Trichopodus trichopterus collected in the swamps of Lakea Dua Village, Buol Regency. The length ranges from 10-18 cm with an average length of 14.43±2.39 cm. Fish weight ranged from 14.50-155.30 g with an average weight of 51.33±25.83 g. The growth pattern is negative allometric. The relative weight shows a value of 102.63±21.40, meaning that the source of feed is abundant in the Trichopodus pectoralis environment and the condition is healthy. The Fulcon condition factor value is 1.61±0.55 and the relative condition factor is 1.04±0.33, meaning that the condition factor value is below 3. This shows the cheek-shaped fish. Keywords: condition factor; length weight; Trichogaster pectoralis

Lake Poso is one of the ancient lakes in the world. This lake is known to have high diversity of endemic fish. Several exotic fish species have been introduced to increase the fisheries production in the lake. However, it is reported that the introduced fish is one of the causes of the threat of the existence of endemic fish in this lake. This study aimed to obtain the latest information on endemic (Adrianichthyidae, Gobiidae, and Zenarchopteridae), and introduced fish in Lake Poso. The research was carried out from May to July 2019 at 17 stations on the coast and rivers of Lake Poso. Fish were collected using a seine net, tray net, and hook and line. The results showed that there were 13 species of fish belonging to eight families and 11 genera. A total of six endemic fish species were still found in this study, namely Adrianichthys oophorus, Oryzias nebulosus, O. nigrimas, O. orthognathus, Mugilogobius sarasinorum, and Nomorhamphus celebensis. Seven species of introduced fish were found, namely Anabas testudineus, Aplocheilus panchax, Channa striata, flowerhorn (Cichlasoma sp.), Melanocromis auratus, Oreochromis niloticus, and Trichopodus trichopterus. Cichlids (flowerhorn, M. auratus, and O. niloticus) have the potential to be invasive due to their adaptability and ease of reproduction in Lake Poso. Conservation of the fish endemic to Lake Poso must be a serious concern for the government, academics, and the community. Ex-situ conservation can be a strategy to conserve the endemic fish of Lake Poso through controlled captivity.