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- W52247073 abstract "Production of giant black tiger shrimp (Penaeus monodon) in earthen ponds in thetropical region may vary as the pond matures, depending on water quality andphytoplankton community structure. The objectives of the present study were todetermine water quality and marine phytoplankton succession in ponds of differentages, to nutritional value of isolated species of a dominant cyanobacterium in theshrimp ponds in comparison with a beneficial diatom and green alga and toinvestigate how phytoplankton community structure could be affected by alterationof macronutrient concentrations in mixed cultures. The field study was carried out inan intensive shrimp farm in Kuala Selangor, Malaysia. Phytoplankton and watersamples were collected from ponds of different ages categorized as new (<1yr),intermediate (2-5yrs) and old (>10yrs), for 16 weeks of shrimp culture. Fluctuationof nutrient and chlorophyll-a concentrations were not different from other tropical shrimp ponds in the region. Cyanobacteria (five genera), diatoms (24 genera),dinoflagellates (four genera) and green algae (three genera) were four dominantgroups of phytoplankton found in all the shrimp ponds. Diatoms were dominantduring the early stage of the culture in new ponds whilst blue–green algae dominatedintermediate and old ponds throughout the culture period. Shrimp production in newponds were significantly higher than intermediate and old ponds (p<0.05) probablydue to the abundance of diatoms at the beginning of the culture cycle, suitable as livefeed for zooplankton and shrimp larvae. Pseudanabaena tenuis was found abundantin all pond categories throughout the culture period. The cyanobacterium wasisolated for surface structure and proximate analysis in the laboratory. Result showedthat P. tenuis have lower nutritional value in comparison with a common diatom(Chaetoceros calcitrans) and a green alga (Chlorella pyrenoidosa), indicating that iswas not part of consumable algae among grazers. All the above microalgae specieswere used in the nutrient enrichment bioassays in the laboratory to determine thegrowth and competition among species when grown singly and in mixed cultures.The result showed that the diatom grew well in single cultures and competedsuccessfully over other microalgae in mixed cultures when silica concentrationsincreased whilst other essential growth nutrients were not limited. This presentresearch gives an idea of how shrimp production in ponds of different ages could beaffected by water quality and phytoplankton community structure and how alterationof nutrient concentrations could be use to stimulate growth of beneficial algae andsuppress harmful algae in mixed culture systems which need further research forbetter understandings." @default.
- W52247073 created "2016-06-24" @default.
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- W52247073 date "2009-06-01" @default.
- W52247073 modified "2023-09-26" @default.
- W52247073 title "Effect Of Water Quality And Marine Phytoplankton Community Structure On Shrimp Production In Tropical Ponds" @default.
- W52247073 hasPublicationYear "2009" @default.
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