000 06515nas|a2200445 i 4500
005 20260819085919.0
008 030115s2000 th uzm rtt 00| a1eng d
035 _a.b11873450
099 9 _aAIT Diss. no. AQ-00-04
100 0 _aNongnuch Laohavisuti
245 1 0 _aUses of aquatic macrophytes for nutrient removal in a recirculation system for tropical fish culture
260 _aBangkok :
_bAsian Institute of Technology,
_c2000
300 _a178 leaves
490 1 _aDissertation ;
_vno. AQ-00-04
502 _aThesis (Ph.D.) - Asian Institute of Technology, 2000
500 _aA dissertation submitted in partial fulfillment of the requirements for the degree of Doctoral of Technical Science, School of Environment, Resources and Development
520 _aThe objective of this thesis research is to assess the role and efficiency of aquatic plant on nutrient removal in a recirculation system for aquarium {uFB01}sh culture. A {uFB01}eld survey of commercial aquarium {uFB01}sh farms was conducted to better understand the water use in culture systems before setting up the experiments. A series of experiments was conducted on ammonia production by aquarium {uFB01}sh and nitrogen uptake rates by submerged and emergent aquatic plants. The results obtained from these experiments provided basic information to design a pilot-scale recirculation system, which efficiency in nutrient removal was then evaluated. Results show an inverse relationship between {uFB01}sh size (weight) and rate of total ammonia nitrogen (TAN) production in gold{uFB01}sh (Carassius auratus), angel{uFB01}sh (Pterohyllum scalare) and sail{uFB01}n molly (Poecilia latzpinna). TAN production of these {uFB01}sh are expressed in these equations: (a) gold{uFB01}sh: TAN= 63.88W°"2, (b) angel{uFB01}sh: 2"/nv= 25.20 W°2° and (C) Sail{uFB01}n molly: TAN = 39.32W°'2. The hourly rates of ammonia production by these {uFB01}sh reached the peak 4 hours after feeding. Fecal nitrogen production rate was also related to {uFB01}sh size. TAN released from fish feed increased to 0.53 mg/g dw/d. Six species of common aquarium plants were tested for their efficiency (rate) in uptake of ammonium and nitrate as nitrogen nutrient sources. Among submerged plants, water wisteria (Hygrophila di{uFB01}ormis) showed the greatest uptake of NH4-N and NO;-N at the rate of 7.58: 0.23 and 3.38i0.05 mg N/ g dw/d, respectively; followed by giant vallis (Vallisnaria giganlea) and ambulia (Limnophila heterophylla). Among emergent plants, dwarf bacopa (Bacopa mormieri) showed the greatest uptake of NI-14-N and NO;-N at the rate of 4.82i0. I3 and 3.29: 0.44 mg N/ g dw/d, respectively; followed by sword plant (Echinodorus cordifolius) and red ludwigia (Ludwigia regens). Nitrogen uptake rate by water wisteria and dwarf bacopa also varied with light intensity at 3,500, 7,000 and 10,500 lux. The nitrogen uptake rate of water Wisteria at 3,500 and 7,000 lux was signi{uFB01}cantly higher than that at 10,500 lux, and the rate for dwarf bacopa at 7,000 and 10,500 lux was signi{uFB01}cantly higher than that at 3,500 lux. In the presence of various nitrogen and phosphorus concentrations under natural lighting, the optimal N/P ratio is 5 for water Wisteria and IO-20 for dwarf bacopa. Wastewater from aquarium {uFB01}sh (gold{uFB01}sh) tanks was supplied to 2 species of aquatic plant (water wisteria and dwarf bacopa) with spray and sand substrate in a small-scale recirculation system. There was no signi{uFB01}cant difference among all treatments for gold{uFB01}sh growth performance. The FCR of gold{uFB01}sh in the sand system was signi{uFB01}cantly lower than that in the spray system. The growth performance of aquatic plants in the sand system was signi{uFB01}cantly (P<0.05) better than in the spray system. The results of the pilot scale recirculation system show that important water quality parameters for {uFB01}sh culture could be maintained in optimal conditions. This was demonstrated by the successful removal of TAN and NO;-N at low levels by the aquatic plant (water wisteria) treatment. During the 12-week experimental period, gold{uFB01}sh grew from 4.531-0.11 g at stocking to 103810.30 g at harvest, with an average daily weight gain of 0.071001 g/day. The average total weight of gold{uFB01}sh was 867 29140.27 g/tank (1.54 m2), ranging from 815.2 to 946.5 g/tank. The average survival rate of gold{uFB01}sh was 91 % and feed conversion ratio was 2.7. The gold{uFB01}sh-aquatic plant recirculation system provides an effective means in maintaining water quality and reducing amount of water requirement for aquarium {uFB01}sh production. However, the results of this study showed that there was poor growth performance of aquatic plant. This was probably due to the low light intensities (530-4,080 lux) during daytime of study period and imbalance of N/P ratio according to pl-I level of water (7.6-8.2) that resulted to phosphorus precipitation. Therefore, using {uFB01}sh-aquatic plant system for commercial production in future, environmental conditions for plant growth e.g. nutrient supplementary, light condition temperature and culture season, etc. have to be considered.
650 1 0 _aTropical fish
650 1 0 _aAquatic plants as feed
650 1 0 _aFish-culture
700 1 _aLin, Chang Kwei,
_eChairperson
700 1 _aHambrey, J.,
_eExamination committee
700 1 _aAnnchhatre, Ajit P.,
_eExamination committee
700 1 _aBoyd, Claude E.,
_eExamination committee
710 2 _aRoyal Thai Government,
_eScholarship donor
810 2 _aAsian Institute of Technology.
_tDissertation ;
_vno. AQ-00-04
856 _3Full-Text
_uhttp://203.159.5.9/ait-thesis/detail.php?q=B00342
907 _a.b11873450
_bmnait
_cu
902 _a240403
998 _b0
_c030115
_dm
_ea
_fu
_g0
945 _lmnarc
945 _lmnait
945 _lmnait
942 _c22
942 _c14
909 _aBarcode : 30050120566111
_bCREATED : 2003-01-15
_cRECORD # : i12312125
_dLPATRON : 1015151
_eLCHKIN : 2019-03-27
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 1
_iTOT CHKOUT : 15
_jTOT RENEW : 11
909 _aBarcode : 30050160038823
_bCREATED : 2016-01-19
_cRECORD # : i12870043
_dLPATRON : 0
_eLCHKIN : -
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 0
_iTOT CHKOUT : 0
_jTOT RENEW : 0
909 _aBarcode : 30050120503643
_bCREATED : 2018-11-19
_cRECORD # : i13144406
_dLPATRON : 1027164
_eLCHKIN : 2018-11-23
_f# RENEWALS : 0
_g# OVERDUE : 0
_hIUSE3 : 1
_iTOT CHKOUT : 1
_jTOT RENEW : 0
999 _c125836
_d125836