Effect of water aeration and nutrient load level on biomass yield, N uptake and protein content of the seaweed Ulva lactuca cultured in seawater tanks

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dc.contributor.authorMsuya, Flower E.
dc.contributor.authorNeori, Amir
dc.date.accessioned2016-02-15T09:57:34Z
dc.date.available2016-02-15T09:57:34Z
dc.date.issued2008
dc.description.abstractThe effects of 16 different combinations of nutrient load and agitation on yield, nutrient uptake and proximate chemical composition of the seaweed Ulva lactuca cultured in tanks were evaluated. Intensive fishpond outflow passed through seaweed tanks at four nutrient loading levels and four water agitation combinations of water exchange, bottom aeration and frequently changing water levels (an accelerated tide regime). Specific results from these outdoor experiments were examined further under controlled conditions in laboratory experiments. Agitation treatments affected the performance of U. lactuca only under TAN (NH3 þ NHþ 4 ) load levels below 4 g N m−2 day−1; biofiltration of TAN was the parameter most affected. Biomass yields at each of the four nutrient loading levels were not significantly different between the agitation treatments. Protein content increased significantly with increasing nutrient loading. The agitation treatments had a slight effect on seaweed protein content only at the lowest nutrient loading levels. There were no significant differences in dissolved oxygen concentration, pH, and temperature among the agitation treatments at all nutrient loading levels. Under laboratory conditions, growth rates, protein content, and photosynthetic and biomass yield of the seaweed were affected by water velocity under low nutrient concentrations. It is concluded that the effect of air agitation under the conditions of these experiments was not directly related to photosynthesis, excess dissolved oxygen, or carbon limitation, but to the diffusion of macro nutrients from the water to the seaweed. Therefore, once nutrient concentrations are high enough (above about 4 μM of TAN with the other nutrients in their corresponding proportions), aeration per se is not essential for effective growth and biofiltration by seaweeds.en_US
dc.identifier.citationMsuya F.E. and Neori A. 2008. Factors that determine the performance of the seaweed Ulva lactuca in intensive tank culture. Journal of Applied Phycology 20: 1021-1031en_US
dc.identifier.other10.1007/s10811-007-9300-6
dc.identifier.urihttp://hdl.handle.net/123456789/386
dc.language.isoenen_US
dc.publisherSpringeren_US
dc.subjectSeaweed biofiltrationen_US
dc.subjectWater movementen_US
dc.subjectAgitation treatmenten_US
dc.subjectFishpond effluentsen_US
dc.subjectNutrient uptakeen_US
dc.subjectYielden_US
dc.titleEffect of water aeration and nutrient load level on biomass yield, N uptake and protein content of the seaweed Ulva lactuca cultured in seawater tanksen_US
dc.typeJournal Article, Peer Revieweden_US
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