The suitable stocking density to growth of macroalgae Spirogyra spp. and its ability of ammonia nitrogen removal
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Abstract
Studying the suitable stocking density to growth of Spirogyra spp. consisted of 5 treatments and 3 replications, Spirogyra spp. was reared in different stocking densities as 0 (control) 1 3 5 and 7 g fw (fresh weight) L-1 for 3 weeks and then studied its ability of ammonia nitrogen removal at the suitable stocking density for 3 days. The results indicated that weight gain and specific growth rate of Spirogyra spp. at all treatments were the highest in the first week of experiment and gradually decreased in the second and the third week respectively which weight gain and specific growth rate of Spirogyra spp. were cultivated at 1 g fw L-1 was higher than control treatment and other treatments. These parameters would decrease when stocking density increase. At the end of experiment, average weight gain and average specific growth rate of Spirogyra spp. rearing at 1 g fw L-1 were higher than other treatments (1.41±3.62 g and 5.57±4.56 %d-1 respectively) and showed significant difference (p<0.05) when compared with the treatments of 5 and 7 g fw L-1 but no significant difference (p>0.05) when compared with 3 g fw L-1 treatment. Finally, the suitable stocking density to growth of Spirogyra spp. in this study was 1 g fw L-1 which showed the best of weight gain and specific growth rate and its ability of ammonia nitrogen removal was 0.045±0.003 mg-N L-1 g fw-1 d-1. In addition, Spirogyra spp. cultivation for 1 week revealed higher product than 2 and 3 week cultivation period.
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