The moisture content of fresh A. nodosum was 2.83 ±0.07 kg water/kg dry matter.
Distilled water was selected as the medium for transferring ultrasound energy to A. nodosum. A significant change was observed in the weight of the seaweed after ultrasonic pre-treatment.
For example at the lowest ultrasound intensity (7.00W cm2) a gain of 19.63% in weight gain was observed whereas for 35.61 and 75.78 W cm2 pre-treatments weight gains of 9.80% and 0.84%, respectively were observed (Fig. 2).