OPEN-WATER CULTIVATION OF SEAWEED GENUS GRACILARIA IN THE COASTAL WATERS OF QESHM ISLAND FOR AGAR PRODUCTION

A. Lababpour
Production of agar from marine macroalga Gracilaria makes it important for the local enterprise of coastal communities. The aim of this study is to gather basic technical data for the development of Gracilaria mariculture in Qeshm Island of Iran. Monoline and net methods were applied to determine biomass and the agar productivity. Biological parameters of chlorophyll, thallus length, position along the thallus, and color; environmental parameters of temperature, pH, salinity, TDS and TSS were measured during cultivation. The changes of NO2-, NO3- and PO43- ions were monitored daily. STATISTICA 10 Software was used for statistical analysis of data. The experiments were performed from 1 May to 30 June 2012 in Qeshm Island. Biomass values increased during the experimental period and reached a maximum of 5890 g Fw m-1 (30th day) and 5300 g Fw m-1 (36th day) in monocline and net methods respectively. Mean growth rate (GR) and relative growth rate (RGR) for the monoline and net methods were 4.4% d-1, (4.0±0.30) and 4.3% d-1, (3.0±0.25), respectively. Positive correlations were found between biomass (r=0.59; p<0.001) and GR (r=0.61; p<0.001). During the study period, temperature was changed in the range of 25.35-30.75°C (mean: 28.03±1.23), pH in the range of 7.9-8.4 (mean: 8.2±1.14), and salinity from 41.2 to -49.75 (mean: 46.13±2.11) PSU. Extracted agar yield in the cultivation period ranged from 40.4 to 15%. These results demonstrated the great potential of Gracilaria for the mariculture system and its economic potential use for agar production by Qeshm Island coastal communities.
Lababpour, A. (2014). OPEN-WATER CULTIVATION OF SEAWEED GENUS GRACILARIA IN THE COASTAL WATERS OF QESHM ISLAND FOR AGAR PRODUCTION. Acta Hortic. 1054, 325-332
DOI: 10.17660/ActaHortic.2014.1054.39
https://doi.org/10.17660/ActaHortic.2014.1054.39
Gracilaria, macroalgae mariculture, agar production, monoline technique, net technique
English

Acta Horticulturae