Laju Pertumbuhan Rumput Laut Gracilaria sp Melalui Budidaya IMTA (Integrated Multi Trophic Aquaculture) di Pantai Geger, Nusa Dua, Kabupaten Badung, Bali

Abstract

Gracilaria sp is red alga which belong to class rhodophyceae. It can grow in shallow salt water with a general characteristic is having a cylindrical and branched thallus form. Seaweed cultivation can be performed through IMTA (Integrated Multi Trophic Aquaculture) method. The basic principle of cultivation through the IMTA method is utilizing service of the low thropic level species in marine ecosystems, such as shells and seaweed. This method is believed to be able to overcome the environmental problems caused by cultivation activities, such as feces and uneaten feed. This research was perfomed 45 days, from February 25 to April 11, 2017. It was held at Geger Beach, Nusa Dua, Badung Regency, Bali, using a complete randomized design method that consist of three treatments and three repetition for each treatment. Treatment control (T1) consisted of 10 bunches of seaweed 100 grams without the abalone, treatement 2 (T2) consisted of 10 bunches of seaweed 100 grams and 20 abalones and treatement 3 (T3) consisted of 10 bunches of seaweed 100 grams and 40 abalones. The result showed that specific growth rate in Gracilaria sp. was highest in treatment T1, compared to treatment T2 and T3. This was caused by the cage construction of abalone amd the present of small mesh size net to cover the seaweed planting, which made the growth was not optimal. However, the use of a nets system in seaweed cultivation could minimize the loss of thallus. It was proved by the survival rate of seaweed in first, second and third, that is averagely high, ranging from 90% to 100%. Physical and chemical water quality parameters are also measured, and It showed that the water quality was suitable for the cultivation of both, seaweed and abalone.

CULTIVATION OF SEAWEED Caulerpa racemosa USING DIFFERENT SUBSTRATES ON A LABORATORY SCALE

“…The survival rate of seaweed, according to Yustiani et al in Yudiastuti et al 4 , is calculated using the following formula:…”

PENGARUH KEDALAMAN BERBEDA TERHADAP KANDUNGAN KLOROFIL-a DAN KAROTENOID RUMPUT LAUT Kappaphycus alvarezii DI PERAIRAN TELUK EKAS, LOMBOK TIMUR

“…kecepatan arus di lokasi penelitian cukup optimal, yaitu berkisar 0.35 -0.42 m/s. Hal ini sesuai dengan pernyataan Yudiastuti et al, (2018), pergerakan air laut yang ideal berkisar antara20-40 cm/detik atau 0,2-0,4 m/detik. Kisaran nilai nitrat yaitu 2 mg/l.…”

TEKNIK DAN MANAJEMEN USAHA BUDIDAYA RUMPUT LAUT (Eucheuma cottonii) MENGGUNAKAN METODE LONG LINE DI PELAKU UTAMA WAETUWO KECAMATAN TANETE RIATTANG TIMUR, KABUPATEN BONE PROVINSI SULAWESI SELATAN

“…Pertumbuhan absolut yang dicapai selama praktik meningkat, seperti yang digambarkan pada Gambar 1 di atas. Menurut Yudiastuti et al (2018), faktor-faktor yang mendukung kelangsungan hidup rumput laut bertanggung jawab atas peningkatan pertumbuhannya, seperti lingkungan perairan yang mendukung pertumbuhan sementara lingkungan yang negatif menghambatnya (Yudiastuti et al, 2018). Minggu pertama, bobot rata-rata rumput laut adalah 23 g, dan pertumbuhan bobot rumput laut meningkat dari sebelumnya 30 g menjadi 59 g pada hari ke-14 minggu kedua.…”