Effect of domestic sewage on the vegetative growth of juvenile plants of Sargassum johnstonii in the laboratory culture

A. Tewari, P.S. Rao


One-tenth to one-thousandth concentrations of sewage in seawater significantly increased the number of pseudophylls in the germlings of Sargassum johnstonii . The length of the germlings, length and width of each pseudophyll was significantly increased by Eshmedium followed by one-tenth and one-hundredth concentrations of sewage. One-thousandth concentration of sewage also increased the length and width of pseudophylls. One-fifth concentration of sewage inhibited all the studied morphological characters except the width of pseudophylls. There was no difference in growth of the plants in ES and one-tenth concentration of sewage after 90 days. Therefore the latter concentration of sewage can be routinely used for large scale culture of Sargassum in field nurseries and for laboratory culture. The significance of "Morphological Growth Index" is discussed


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