LAJU SINTASAN DAN PERTUMBUHAN NILA MERAH (Oreochromis sp.) BERDASARKAN WARNA TUBUH PADA FASE PEMBESARAN

YUNI RIAWAN, Prof. Dr. Ir. Rustadi, M.Sc.

2014 | Skripsi | BUDIDAYA PERIKANAN

Penelitian ini bertujuan untuk mengetahui laju sintasan dan pertumbuhan nila merah berdasarkan karakter warna tubuh. Penelitian dirancang menggunakan rancangan acak lengkap (RAL) dengan 10 perlakuan dan 2 ulangan. Keramba jaring berukuran 4x4 m2 sebanyak 20 buah diletakkan pada kolam berukuran 1000 m2, kedalaman air dipertahankan 70-80 cm. Benih yang digunakan yaitu nila merah (Oreochromis sp.) strain Nilasa jantan ukuran 111,9 gram dan betina 94 gram, kepadatan 5 ekor/ m2. Pemberian pakan pelet dilakukan 2 kali sehari secara ad libitum dengan kadar protein 31-33 %. Pemeliharaan dilakukan selama 84 hari. Parameter yang diamati yaitu pertumbuhan mutlak, laju pertumbuhan spesifik, laju sintasan, nisbah konversi pakan, faktor kondisi. Data dianalisis menggunakan analysis of varian dan uji jarak berganda Duncan dengan tingkat kepercayaan 95%. Kualitas air dianalisis secara deskriptif. Hasil menunjukkan laju sintasan dan pertumbuhan berbeda antar warna tubuh nila merah. Laju sintasan terbaik yaitu pada jantan kontrol dan jantan merah albino sebesar 96,9 %, diikuti betina merah merah polos sebesar 96,3 %. Pertumbuhan terbaik pada ikan nila jantan merah albino yang menunjukkan laju sintasan dan laju pertumbuhan spesifik panjang lebih bagus (P<0,05) yaitu sebesar 96,9 %, dan 0,032 %/hari. Pertumbuhannya cenderung baik (P>0,05) pada pertumbuhan mutlak panjang 9,2 cm, laju pertumbuhan spesifik berat 0,086 %/hari, faktor kondisi 1,9 dan konversi pakan 1,90. Laju sintasan dan pertumbuhan terbaik pada nila merah strain Nilasa dengan karakter jantan merah dan terendah yaitu pada betina bintik.

The purpose of this study was to determine survival and growth rate of red tilapia based on body’s color characters. The study was designed using the completely randomized design (CRD) with 10 treatments and two replications. The fish were stocked in 20 units of 4x4 m2 cages those placed in 1000 m2 pond with water depth of 70-80 cm. Fish seeds used was red tilapia (Oreochromis sp.) Nilasa strain with a mean size of male 111.9 gram and female 94 gram; 5 fish/m2 of stocking density. Feeding was done 2 times a day by ad libitum by feed with 31-33 % crude protein. The harvesting was done after 84 days culture. Parameters observed were length, weight, fish amount, feed amount and water quality. Data were analyzed using analysis of variance and Duncan's multiple range test with a confidence level of 95 %. Water quality was analyzed descriptively. The results showed a different growth rate and survival rate between the body’s color of red tilapia. The best survival rate were male control and male red albino at 96.9 %, followed by plain female 96.3 %. The best growth in tilapia was male red albino which shows the survival rate of 96.9 % and specific growth rate of length of 0.032 %/day (P<0.05). It’s absolute length growth of 9.2 cm, specific growth rate of weight of 0.086 %/day, conditions factor of 1.9 and feed conversion ratio of 1.90 tended better (P>0.05). The best survival and growth rate of the red tilapia Nilasa strains with character red males and females black spots it’s low.

Kata Kunci : Laju sintasan, nila merah, pertumbuhan, strain nilasa dan warna tubuh