The removal efficiency harmful algal cells of clay slurry with different concentrations

Subject Areas : New Technologies in Aquaculture Development

Received: 2021-02-02 Accepted : 2021-02-02 Published : 2020-11-21

Keywords: Cochlodiniom polykricoides, Protoperidinium quinquecorne, Keywords: Red Tide, slurry clay, Dinoflagellate algae,

Abstract :

  Abstract Dinoflagellates are an important group of marine phytoplankton whose blooms of some species causes great problems for marine ecosystems and aquaculture activities. The bloom due by Cochlodinium polykricoides during 2008-2009 caused severe damage to aquatic animals in the Persian Gulf and the Oman Sea. Therefore, this study was investigating the removal efficiency of algal cell with different concentrations of clay slurry (0.5, 1, 2, 4 and 10 gr/l). therfore, after separating C.polykricoides and Protoperidinium quinquecorne from seawater (with cell density of 16000-14000), by adding 50 ml of different concentrations of clay  slurry, cell density  Was counted after 2, 4, 20 and 24 hours. The results showed that in C.polykricoides microalgae, the best performance of 4 and 10 gr / l concentrations after 24 hours were 99%. So after 4 and 10 gr/l algal cells density was reduced to 53% in 0.5 gr / l and in 2 hours. The best removal effeciency in this study on P. quinquecorne had  99% in 4 gr / l at 24 hours, which did not show a significant difference with 4 and 10 gr / l at other times (p≥0.05). Therefore, considering that the addition of clay slurry should have the least environmental impact and damage for ecosystem and organisms, the clay slurry concentration is variable depending on the type of target species. According to the results, clay slurry concentration 4 gr/l for P.quinquecorne and 0.5 gr/l for C.polykricoides are recommended.