Kelangsungan hidup dan pertumbuhan benih ikan sidat Anguilla marmorata ukuran 1 gram dalam sistem resirkulasi pada padat penebaran berbeda

Abstract

Eel Anguilla marmorata is one of fish comodity that has high value, but its production level is not met with the market demand yet. The effort is needed to be done in order to increase production of eel fry by an intensive rearing system through high rearing density. This study was performed to analyze the effect of rearing density on eel Anguilla marmorata fry production in recirculation system by analizing survival rate and growth of fry. Fry used was 1,24 ± 0,02 g in weight and were reared in aquaria 80 cm x 40 cm x 40 cm filled with 64 liters water in recirculation system. This study used the completely randomized design with 3 treatments that were rearing density those are 1, 2, and 3 fry/liter and 3 replication. This were feed by Tubifex ad libitum. Collected data were survival rate, growth, standard deviation of weight, and feed conversion ratio. The result of study showed that survival rate and standard deviation of weight did not affected by rearing density, while growth and feed conversion ratio were did. Survival rate of fish was high; 76,92-77,95%. Growth were increased, while feed conversion ratio were decreased by increasing of rearing density.

Ikan sidat A. marmorata merupakan komoditas perikanan yang memiliki nilai jual tinggi, tetapi produksinya masih belum dapat memenuhi permintaan pasar. Untuk itu diperlukan upaya peningkatan produksi benih ikan sidat pada kegiatan pendederan secara intensif melalui peningkatan padat penebaran. Penelitian ini bertujuan untuk menganalisis pengaruh padat penebaran terhadap produksi benih ikan sidat A. marmorata yang dipelihara dalam sistem resirkulasi melalui kajian kelangsungan hidup dan pertumbuhan. Benih yang digunakan berbobot 1,24 ± 0,02 gram/ekor yang dipelihara pada akuarium berukuran 80 cm x 40 cm x 40 cm dan diisi air sebanyak 64 L. Penelitian ini menggunakan metode rancangan acak lengkap dengan 3 perlakuan padat penebaran yaitu 1, 2, dan 3 ekor/L dan masing- masing 3 ulangan. Pakan berupa cacing sutera diberikan secara ad libitum. Datayang diambil meliputi kelangsungan hidup, pertumbuhan, koefisien keragaman bobot, dan konversi pakan. Padat penebaran ikan sidat 1, 2, dan 3 ekor/L pada sistem resirkulasi tidak mempengaruhi kelangsungan hidup, yaitu menghasilkan derajat kelangsungan hidup sebesar 76,92-77,95%. Peningkatan padat tebar meningkatkan pertumbuhan dan menurunkan konversi pakan. Padat tebar 3 ekor/L menghasilkan pertumbuhan tertinggi dan konversi pakan terendah.