Abstract
The effects of 33, 25 and 17‰ salinity on the productivity and agar production of Gracilaria verrucosa Strain G-16 were compared during three distinct temperature periods in greenhouse cultivation trials. Salinities of 17‰ consistently resulted in low productivity and low agar gel strengths. The experimental periods which encompassed environmental extremes in seasonal temperature changes also showed significant differences in productivity, agar yield, and agar gel strength. Best gel strength resulted during the experimental period with minimal temperature fluctuations in a physiologically favorable range, and at 25 and 33‰. Algal productivity demon-strated acclimation responses to variable temperatures. Agar gel strength tended to respond to extremes in temperature, rather than median temperatures. The results suggest that while numerous sites may provide high biomass yields, temperature and salinity extremes may adversely affect agar product quality.
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