DEPTH-DEPENDENCY OF THE AGAROPHYTE RED ALGA Gracilaria corticata J. AGARDH FOR AGAR YIELD AND QUALITY DURING ITS GROWING SEASON

Year 2016, Volume: 2 Issue: 2, 76 - 84, 13.01.2016

Maryam Abidizadegan Mohammad Kazem Khalesi Danial Ajdari

https://doi.org/10.3153/JAEFR16010

Abstract

The
impacts of two depth ranges on the rhodophyte Gracilaria corticata
for agar yield and quality were determined during its growing season (December
to March) at intertidal waters. Average 4-month agar at 2-3 m and 5-6 m were 34
±0.04%
and 42 ±0.05%, respectively. The lowest
(30 ±2.89%) and highest (51 ±4.16%) agar yields, respectively, were estimated
in December at 2-3 m and in January at 5-6 m. At 2-3 m, the 4-month averages
were not significantly different (P>0.05). G. corticata from a depth of 2-3
m yielded the strongest (30.64 ±1.49 g cm⁻²) agar gel in
December, and the alga sampled at 5-6 m in January revealed the lowest agar
strength (7.94 ±0.38 g cm⁻²).
Agar lightness (L) ranged
from lowest (59.6 ±3.85) at 2-3
m in December to greatest (86.8 ±3.11) at 5-6
m in February. Agar yellowish factor (a) was highest (11.6 ±3.21) at 2-3 m in December and lowest (4.8 ±1.64) at 5-6 m in February. Agar reddish factor (b) was highest
(48 ±2.24) in March and lowest (38.8 ±1.30) in December at a depth of 2-3 m. G. corticata growing at relatively deeper intertidal zone yields more
quality agar, and December and late winter are the best times to obtain a more
rigid and enhanced agar gel.

Keywords

Red algae, Depth dependency, Agar properties, Intertidal

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