A preliminary assessment of water quality in fish cages on Lake Kariba, Zimbabwe
The water quality in fish cages on Lake Kariba was studied. The Kruskal-Wallis test was used to determine whether the water quality parameters differed significantly among the cage-types (cage-type effect). Secchi disc readings ranged from 2 to 4 metres, while temperature ranged from 23 degree C to 29.5 degree C. The observed conductivity was between 98.7 mu S/cm and 102.3 mu S/cm. The pH was between 6.31 and 7.82. Concentrations of dissolved oxygen varied from 1.55 to 6.47 mg/l, while dissolved oxygen saturation ranged from 22.3% to 83.1%. Within the same month, temperature did not differ significantly among cages. Conductivity, pH, dissolved oxygen concentration and dissolved oxygen saturation differed significantly among the 3 cage-types. Temperature and pH levels in the cages were close to the optimum levels for the culture of cichlids. Sub-optimal levels of dissolved oxygen occurred occasionally in the octagonal cages.
| Main Author: | |
|---|---|
| Format: | monograph biblioteca |
| Language: | English |
| Published: |
Department of National Parks and Wild Life Management
1994
|
| Subjects: | Aquaculture, Ecology, Management, Zimbabwe, Lake Kariba, water quality, fish cages, cage culture, |
| Online Access: | http://hdl.handle.net/1834/24973 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|