PERKEMBANGAN EMBRIO IKAN Torsoro (Tor soro) PADA SUHU INKUBASI BERBEDA

Abstract

Tor soro merupakan ikan air tawar asli Indonesia bernilai ekonomis tinggi yang belum banyak dibudidayakan secara intensif karena ketersediaan benih banyak mengandalkan hasil pemijahan di alam. Salah satu faktor keberhasilan dalam pembenihan adalah kondisi lingkungan terutama suhu. Tujuan penelitian adalah untuk menentukan suhu optimal bagi perkembangan embrio, lama waktu penetasan, dan daya tetas telur ikan Tor soro. Penelitian dilakukan pada bulan September 2015 di Instalasi Riset Plasma Nutfah Perikanan Air Tawar, Bogor. Penelitian menggunakan rancangan acak lengkap (RAL) dengan empat perlakuan suhu (19°C-21°C, 22°C-24°C, 25°C-27°C, dan 28°C-30°C) dan tiga kali ulangan. Perbedaan suhu inkubasi pada penelitian ini mempengaruhi perkembangan embrio, lama waktu penetasan, dan persentase daya tetas pada telur ikan Tor soro. Suhu inkubasi yang tinggi (28°C-30°C) menyebabkan telur mati setelah delapan jam atau pada saat fase calon embrio. Suhu inkubasi 25°C-27°C menghasilkan waktu penetasan tercepat yaitu selama 77,33 ± 1,15 jam dengan daya tetas yang tinggi yaitu sebesar 84,44 ± 6,94%.

Tor soro is a native freshwater fish to Indonesia. Despite its high value in local and national markets, the fish has not been widely and intensively cultured because its seed supply relies heavily on spawning in nature. One of the success factors of spawning a fish and rearing its seed in a hatchery is controlling environmental conditions, especially temperature. The aim of the study was to determine the optimal temperature for embryo development, hatching time, and hatchability of Tor soro eggs. The study was conducted in September 2015 at the Freshwater Fisheries Germplasm Research Installation, Bogor. A completely randomized design (CRD) was used in the experiment with four temperature treatments (19°C-21°C, 22°C-24°C, 25°C-27°C,and 28°C-30°C) and each treatment had three replications. Differences in incubation temperature in this study affect ed embryo development, hatching time, and the percentage of hatchability on Tor soro eggs. High incubation temperatures (28°C-30°C) had caused the eggs or embryo candidates to die off after eight hours. The incubation temperature of 25°C-27°C generated produces the fastest hatching time of 77.33 ± 1.15 hours with a high hatchability of 84.44 ± 6.94%.