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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2017.1
- 수록면
- 1 - 10 (10page)
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Small-scale fish farmers in developing countries are faced with challenges owing to their limited information on aquaculture management. Nile tilapia farmers in Teso North Sub-County recorded lower yields than expected in 2009 despite having been provided with required inputs. Water quality was suspected to be the key factor responsible for the low yields. This study sought to assess the effects of earthen pond water physico-chemical parameters on the growth of Nile tilapia in six earthen fish ponds under semi-intensive culture system in Teso North Sub-County.
The study was longitudinal in nature with pond water and fish being the units of analysis. Systematic sampling was used to select five ponds while a control pond was purposively selected based on its previously high harvest. Four ponds were fed by surface flow and two by underground water. Each pond was fertilized and stocked with 900 fry of averagely 1.4 g and 4.4 cm. Physico-chemical parameters were measured in-situ using a multi-parameter probe. Sixty fish samples were randomly obtained from each pond fortnightly for four months using a 10 mm mesh size and measured, weighed and returned into the pond. Mean range of physico-chemical parameters were: dissolved oxygen (DO) 4.86–10.53 mg/l, temperature 24-26 °C, pH 6.1–8.3, conductivity 35–87 μS/cm and ammonia 0.01–0.
3 mg/l. Temperature (p = 0.012) and conductivity (p = 0.0001) levels varied significantly between ponds. Overall Specific Growth Rate ranged between 1.8% (0.1692 g/day) and 3.8% (1.9 g/day). Ammonia, DO and pH in the ponds were within the optimal levels for growth of tilapia, while temperature and conductivity were below optimal levels. As temperature and DO increased, growth rate of tilapia increased. However, increase in conductivity, pH and ammonia decreased fish growth rate. Temperature and DO ranging between 27 and 30 °C and 5–23 mg/l, respectively, and SGR of 3.8%/day and above are recommended for higher productivity.
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참고문헌 (33)
참고문헌 신청
Abdel-Fattah ME. / / Tilapia Culture
Abo-State HA / / Effects of Replacement of Soybean meal by DDGS combined with Commercial Phytase on Nile tilapia (Oreochromisniloticus) Fingerlings Growth Performance and Feed Utiliz
BFAR. / / Basic biology of Tilapia
Bartholomew WG. / / Effect of channel catfish stocking rate on yield and water quality in an intensive, mixed suspended-growth production system
Bhatnagar A / 2000 / Causative factors of fish mortality in still water fish ponds under sub-tropical conditions / Aquaculture 1 (2) : 91 ~ 96
Abo-State HA / / Effects of Replacement of Soybean meal by DDGS combined with Commercial Phytase on Nile tilapia (Oreochromisniloticus) Fingerlings Growth Performance and Feed Utiliz
BFAR. / / Basic biology of Tilapia
Bartholomew WG. / / Effect of channel catfish stocking rate on yield and water quality in an intensive, mixed suspended-growth production system
Bhatnagar A / 2000 / Causative factors of fish mortality in still water fish ponds under sub-tropical conditions / Aquaculture 1 (2) : 91 ~ 96
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