03966nas a2200253 a 450000500170000000800410001703500150005810000240007324501260009726000670022330000420029049000270033250001990035950200570055852027500061565000170336565000180338270000360340070000420343670000530347871000570353181000590358885600650364720260817173332.0200114s2017    th ar  |||    000   eng d  a.b123111940 aRasita Srikeudkruen10aComparative evaluation of biofloc and aquamimicry systems :bevaluation of phytoplankton dynamics and gut content of fish  aPathum Thani, Thailand :bAsian Institute of Technology,c2017  a1 online resource (59 leaves) :bill.1 aThesis ;vno. AQ-17-07  aA thesissubmitted in partial fulfillment of the requirements for the degree of Master of Science in Aquaculture and Aquatic Resources Management, School of Environment, Resources and Development  aThesis (M.Sc.) - Asian Institute of Technology, 2017  aThis study aimed at analyzing the plankton dynamicsintwo different systems; biofloc and aquamimicry  systems.The  experiment  was  conducted  in  six  tanks.  Treatments  are  either biofloc system withtapioca starch as a carbon source or aquamimicry system with fermented rice  bran.  Eachtreatment  was  randomly  assigned  to  three  replicates.The  experiment  was conducted 63 days with zero water exchange.Sex reversed Tilapia fry (average weight is 0.25 g) was stocked  atthe  density  of  1000  fry/m3after  7  days  of  biofloc  development. Species identification  and  counting  wasmeasured  in  2  replicates  per  one  sample. Concentrations  of chlorophyll a (chl-a) analysis was performed every day before fish stocking then every 3 days.Additionally, phytoplankton species  and  densityinside  the  fish  stomachs  were  examined.Phytoplankton biomass as Chlorophyll-a measurement in aquamimicry system was higher than biofloc system, on the other hand, the density of phytoplankton in aquamimicry appeared to be lower  than  biofloc  system  even  though  there  were  no  statistically  difference  among  these systems.There   was nosignificantrelationship   between   phytoplankton   biomass   and phytoplankton  density at  the  P<0.05  level.Population  of  Cyanophyceae  and  Chlorophyceae comprised  the  major  part  of  the  density  compared  to  other  groups  in  both  systems. The relationship between phytoplankton density and water quality parameters, microbial activity and energy  input  appearedto  be  better  in  aquamimicry  system  because  significant  relationship(P<0.05)between phytoplankton density and alkalinity, free carbon dioxide, microbial activity and number of bacteria were found only in aquamimicry system. On the other hand, relationship betweenphytoplankton density and nitrate was significant (P<0.05)only in biofloc system due to  number  of  phytoplankton  in  the  system.  There  was  no  relationship  between  number  of phytoplankton  and  temperature  but  were  significant  relationship (P<0.05)with  pH,  DO,  floc volume  andtotal  energy  input. There  were  no  significant  on  phytoplankton  density  in  fish stomach between before and after feeding time, and also among treatments. Cyanophyceae and Chlorophyceae inside the gut were noted in both systems.In this current study, the relationship between phytoplankton and some water quality parameters was not clearly revealed. However, Aquamimicry system is a new technology for tilapia culture andcan provide sustainable tool to solve  environmental,  social  and economic  problems  concurrently.  Additionally,  scientists  and fish farmers can improve and apply this technology to aquaculture systems in the future. 0aNile Tilapia 0aPhytoplankton1 aSalin, Krishna R.,eChairperson1 aSoni, Peeyush,eExamination committee1 aYakupitiyage, Amararatne,eExamination Committee2 aRoyal Thai Government Fellowship,eScholarship donor2 aAsian Institute of Technology.tThesis ;vno. AQ-17-07  3Full-Textuhttp://203.159.5.9/ait-thesis/detail.php?q=B01829