Journal Of Tropical Biosciences
Volume No: 10|
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Title: LIMNO-CULTURAL STUDIES OF HETEROBRANCHUS LONGIFILIS WITHIN A WATER RECIRCULATION SYSTEM IN KADUNA, NIGERIA
*SULEIMAN, B., ABDULLAHI, S.A., ONIYE, S.J. AND AUTA, J.
DEPARTMENT OF BIOLOGICAL SCIENCES,&NBSP;AHMADU BELLO UNIVERSITY, ZARIA
The physico-chemical indices dictating ecosystemic conditions in a simple recirculation aquaculture system were investigated with a view to ascertaining limnological trends in the commercial culture of Heterobranchus longifilis within concrete ponds size 5 x 1.5 x 1m. Temperature, pH, total dissolved solids and electrical conductivity were measured using a Hanna combo model. Dissolved oxygen, biochemical oxygen demand, dissolved carbon (iv) oxide, nitrate-nitrogen, phosphate-phosphorus were measured following standard methods of the American Public Health Association. The mean values of the physico-chemical parameters during the culture period were 6.45, 27.25°C, 39.32cm, 6.55mg/l and 12.05mg/l for pH, temperature, transparency, dissolved oxygen and dissolved carbon (iv) oxide respectively. Generally, over the culture period, total dissolved solids and electrical conductivity increased. A slight increase in nitrate-nitrogen was observed. While, transparency decreased over time. Other parameters remained relatively stable. The relative stability in temperature, pH and dissolved oxygen over the culture period could probably be attributed to the re-circulatory nature of the production system. The use of the water recirculation system in concrete built-up ponds for intensive fish culture is recommended in terms of maintenance of water quality.
Nitrate-nitrogen increases with an increase in the biomass of the system as a result of increased metabolic activities evidenced by growth. Water transparency is inversely proportional to the total dissolved solids and electrical conductivity. The relative stability in temperature, pH and dissolved oxygen over the culture period could probably be attributed to the re-circulatory nature of the production system. The study suggests use of the water re-circulation system in concrete built-up ponds for intensive fish culture for the maintenance of water quality.
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