The Effect of Some Environmental Factors on Biomass and Agar Content of Gracilaria corticata (Gracilariales, Rhodophyta)
MohammadReza Fatemi, Yousef Filizadeh, Farzaneh Rafiee, Behnam Daghoghi, GholamReza Arganji, Hossein Rameshi, Iraj Rajabi

The effects of some environmental parameters
on biomass and agar yield of Gracilariacorticata
were examined under laboratory
conditions. The macroalga was collected from
natural tidal pool with in Bostaneh coast (the
Persian Gulf) in May 2004. In the laboratory,
biomass and agar yield were measured after 45
days examining effect of different temperatures
(24, 27 and 32°C), photon irradiances (24, 66
and 94 photons m-2s-1), and concentrations of
ammonium phosphate [unenriched seawater
(0), 0.04 and 0.08gl-1] in culture. Except for
concentration of ammonium phosphate, other
environmental variables showed no significant
relationship (P>0.05) with biomass and agar
content of G. corticata. The agar yield derived
from the alga cultivated at 0.08gl-1 ammonium
phosphate (22.40±1.81%) was significantly
greater than the other treatments that makes G.
corticata one of the commercial agarophytes

Keywords: Biomass, Temperature, Irradiance, Gracilaria corticata, Ammonium phosphate, Agar


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