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- Title
A comparative study of <italic>Labeo victorianus</italic> (Bouelenger, 1901) and <italic>Oreochromis niloticus</italic> (Linnaeus, 1758) grown in polyculture systems.
- Authors
Orina, P. S.; Charo‐Karisa, H.; Munguti, J. M.; Boera, P.; Abwao, J.; Kyule, D.; Opiyo, M.; Marcial, H.; Manyala, J.; Rasowo, J. O.
- Abstract
Abstract: A polyculture experiment with African carp (<italic>Labeo victorianus</italic>) and Nile tilapia (<italic>Oreochromis niloticus</italic>) was conducted for 24 weeks in 12 earthen ponds measuring 150 m2 to assess their compatibility. Monoculture treatments T1 and T4 for <italic>L. victorianus</italic> and <italic>O. niloticus,</italic> respectively, were the controls for the two species, while treatments T2 and T3 were a polyculture of <italic>L. victorianus</italic> and <italic>O. niloticus</italic> at a ratio of 1:2 and 2:1, respectively. All treatments were carried out in triplicate, with feedings performed twice daily at 09:00 hr and 16:00 hr at 10%, 5% and 3% body weight distributed evenly over the 24‐week growth period. Fish sampling was conducted monthly, while water quality was measured biweekly. Treatment T3 (1L: 2T) had a significantly (<italic>p</italic> < .05) higher survival (L = 49% and T = 87%), compared to T2 (L = 31% and T = 69%, 2L: 1T). <italic>O. niloticus</italic> monoculture treatment (T4) exhibited a significantly higher survival (<italic>p</italic> < .05) and higher growth (80%; 79 ± 20.04 g) than <italic>L. victorianus</italic> monoculture (T1) (50%; 13.12 ± 4.49 g). Dawn and afternoon temperatures ranged between 20.16–24.49°C and 23.76–31.07°C, respectively. The lowest temperatures were recorded in the months of June, July and August. The NH3 concentration was zero at 14:00 hr for all treatments throughout the growth period, but significantly higher (<italic>p</italic> < .05) in T1 at 06:00 hr. The pH and DO levels at 06:00 hr and 14:00 hr were significantly different in all the treatments (<italic>p</italic> < .05). The slow growth of <italic>L. victorianus</italic> can be associated with the low temperatures and DO levels. However, there is need to identify other factors that may have contributed to the poor growth of <italic>L. victorianus</italic>. Accordingly, this study recommends <italic>L. victorianus</italic> growth trials in other culture systems, coupled with different feed formulations, to identify optimal culture conditions.
- Subjects
POLY-aquaculture; LABEO; NILE tilapia; WATER quality; BODY weight
- Publication
Lakes & Reservoirs: Research & Management, 2018, Vol 23, Issue 1, p56
- ISSN
1320-5331
- Publication type
Article
- DOI
10.1111/lre.12202