Optimization of certain physical parameters for the mariculture of Gracilaria edulis (Gmelin) Silva in Minicoy lagoon (Laccadive Archipelago)

Abstract

Mariculture of the agar-yielding, red seaweed, Grucilariu edulis (Rhodophyta) was conducted in Minicoy lagoon during 1990-1992. Experiments were conducted on dry matter accumulation, effects of planting density, depth of water above culture nets, periodic cleaning for removal of epiphytes, grazing and the yield as well as regeneration of G. edulis after successive harvests to understand the optimum requirements of this seaweed. Six culture methods were tested and the yields obtained were compared to arrive at a culture method suitable for Minicoy lagoon.

DOMINANT FACTORS AFFECTING SEAWEED (Gracilaria verrucosa) PRODUCTION IN ACID SULFATE SOILS-AFFECTED PONDS OF LUWU REGENCY, INDONESIA

“…Hendrajat & Pantjara (2004) mentioned that the production of seaweed is better in the ASS-affected ponds with water depth of 0.50 m than that of 0.25, 0.75, and 1.00 m. Recommended water depth of ponds for culturing seaweed is 0.5-0.8 m (Anonymous, 1991). The lower production of Gracilaria edulis obtained at low of water depth could be attributed to the adverse illumination and desiccation of fronds (Kaladharan et al, 1996). The authors also stated that at depth beyond 1.00 m the low production occurred due to the lack of sufficient quantum of light.…”

“…Dry organic matter percentage in the fronds of Gracilaria sp. reached a maximum of 20.4% up to 45 days (Kaladharan et al, 1996). They also said that the daily growth rate of Gracilaria sp.…”

“…A quarter to one third of the harvest was retained at every harvest and left in the ponds, which will continue to reproduce vegetatively for the next harvesting. Many researchers suggest for harvesting the first time at 45 days after stocked (Mubarak et al, 1990;Hurtado-Ponce et al, 1992;Kaladharan et al, 1996). Dry organic matter percentage in the fronds of Gracilaria sp.…”

Optimalisasi Sumberdaya Lahan Untuk Budidaya Tambak Di Kabupaten Luwu Utara Provinsi Sulawesi Selatan

“…Modifikasi Kaladharan et al (1996) Gambar 8. Hubungan antara bobot kering dan lama pemeliharaan rumput laut (Gracilaria edulis) mengurangi melimpahnya klekap dan lumut, maka dapat ditebar ikan bandeng dengan padat penebaran 2.000-3.000 ekor/ha sebagai sistem polikultur di tambak.…”

PEUBAH KUALITAS AIR YANG MEMPENGARUHI PERTUMBUHAN RUMPUT LAUT (Gracilaria verrucosa) DI TAMBAK TANAH SULFAT MASAM KECAMATAN ANGKONA KABUPATEN LUWU TIMUR PROVINSI SULAWESI SELATAN

“…Hapa ditempatkan dalam saluran keliling tambak dengan dasar hapa sekitar 0,1 m di atas tanah dasar saluran keliling. Tinggi air dipertahankan pada kedalaman 0,4 m -0,5 m di atas dasar hapa (Kaladharan et al, 1996). Bibit rumput laut yang baik berupa talus yang muda, bercabang banyak, rimbun, sehat, tidak terdapat bercak, dan tidak ada luka ataupun terkelupas yang diambil dari lokasi budidaya untuk selanjutnya ditebar dalam hapa.…”