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Studies on Diel Feeding and Digestibility of Cyanobacteria

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dc.contributor.author Kariyawasam, L.M.
dc.contributor.author Piyasiri, Swarna
dc.date.accessioned 2013-03-12T08:20:41Z
dc.date.available 2013-03-12T08:20:41Z
dc.date.issued 1999
dc.identifier.citation Kariyawasam, L.M., & Piyasiri, S. (1999). Studies on Diel Feeding and Digestibility of Cyanobacteria. Vidyodaya Journal of Science, 8, 27-38. en-US
dc.identifier.uri http://dr.lib.sjp.ac.lk/handle/123456789/894
dc.description.abstract Beira Lake is eutrophic and covered with a bloom of Cyanobacteria. Hybrids of Oreochromis niloticus and Oreochromis mossambicus dominate the lake. Present study deals with feeding cycle and digestibility of the bloom by Oreochromis species. Volume method and the point method were used to determine feeding intensity of the hybrids. Stomach pH and Chloropltyll-a content in stomach and hindgut were determined at different hours of the day. Four to five diumals were conducted in the field and in the laboratory. Results indicated that, oreochromis hybrids commenced their feeding at the 6th hour and stomachs were filled up to 25%. At the 12th hour, majority of fish were fed from 50% to 75% and on the 18th hour up to full stomach level. Feeding decreased from 75% to 50% at the onest of resting phase at the 24th hour. Results were similar under laboratory conditions. At the onset offeeding pH was 7-8 in the stomach. Ch-a concentration in the hindgut was high, and food passed undigested. At the 12th hour, pH decreased from 3-4 and reached 1-2 at the 18th hour indicating onset of digestion. From 18th to 24th hour, active digestion occurred. en_US
dc.language.iso en en_US
dc.subject Peak feeding en_US
dc.subject Digestibility en_US
dc.subject Cyanobacteria oreochromis en_US
dc.subject Cichlidae en_US
dc.title Studies on Diel Feeding and Digestibility of Cyanobacteria en_US
dc.type Article en_US

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