Browsing by Author "Katonge, Jackson Henry"

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    Anthropogenic activities, land uses, limnology and management of fisheries resources in lake Babati and lake Burunge – Tanzania
    (The University of Dodoma, 2018) Katonge, Jackson Henry
    This study assessed anthropogenic activities, land uses and limnological characteristics, in relation to fisheries resources of Lake Babati (fresh water) and Burunge (soda water). Six villages were also involved, namely Majengo, Singe and Bagara adjacent to Lake Babati and Mwada, Sangaiwe and Vilima Vitatu adjacent to Lake Burunge. Data were collected by using questionnaire surveys, key informant interviews, observation, GIS and RS and Laboratory analysis. Findings have indicated encroachment, overfishing, soil erosion and siltation as major anthropogenic impacts. In Lake Babati, residence and cultivation increased by (44.8%, 12.6%), (28%, 18.1%) and (2%, 11.7%) while grazing decreased by 8%, 38.4% and 11% for Majengo, Singe and Bagara villages beween 2000 and 2017 respectively. As for Lake Burunge, residence and cultivation increased by (30%, 23.5%), (30%, 29.3.1%) and (10%, 53 %), while grazing decreased by 29.1%, and 24.2 % for Mwada, Sangaiwe and Vilima Vitatu villages beween 2000 and 2017, respectively. Physicochemical parameters were almost the same except salinity, conductivity, pH and turbidity which differed (17.4, 28.8 ‰), (37.6, 55 μS/cm), (7.5, 9.54) and (46, 3.1 cm) in Lake Babati and Burunge, respectively. Pollution was evidently due to the existance of phytoplankton blooms. Phytoplanktons were represented by Bacillariophyceae, Dinophyceae, Cyanophyceae, Chlorophyceae and Dictyochophyceae whereas, zooplankton were represented by Cyclopoda, Rotifera, Ciliata and Holizoa. There was a significant difference in the number of plankton cells between Lakes being higher for the dry season than the wet. Fish species; Oreochromis amphimelas, Macrobrachiunus caradina were restricted to dry season; Oleochronmis esculentus Clarias gariepinus, Rhabdalestes leleupi and Petersius tangensis in wet season and Clarias gariepinus and Oleochronmis esculentus occurred in both wet and dry season. Variation in plankton composition, abundance and diversity in different seasons which implied that, the influence of season was important in the management of water quality, plankton and fish production. Therefore, the study recommends local communities and stakeholders involvement in Lakes management, establishment of adequate buffer zones, promotion of income generating activities such as beekeeping, aquaculture and horticulture for sustainability of fishery resources. Finally, the study proposes Fisheries and Water Quality Management framework for implementation and operation.
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    Dry season abundance, distribution and diversity of freshwater plankton in lakes Babati and Burunge, Northern Tanzania
    (Animal Research International, 2023) Katonge, Jackson Henry; Kaswamila, Abiud Lucas; Hamisi, Mariam Issa
    This study investigated the abundance, distribution and diversity of planktonic organisms in Babati and Burunge lakes in Manyara region. Field sampling of phytoplankton and zooplankton were conducted in July and August 2022 followed by laboratory analysis. Phytoplankton communities were dominated by Bacillariophyceae (35.90%, 35.40%) and Chlorophyceae (32.10%, 24.00%) for Babati and Burunge lakes respectively. Among the zooplankton, Cladoceridae (37.70%) was most abundant in Lake Babati, while Cyclopidae (36.60%) was most abundant in Lake Burunge. Lake Babati had higher plankton species richness (S = 50) compared to Lake Burunge (S = 45). A slightly higher phytoplankton diversity, H = 3.14 was observed in Lake Burunge compared to Lake Babati, H = 3.04. Lake Babati had slightly higher zooplankton diversity, H = 2.61 compared to Lake Burunge, H = 2.30). Evenness (E) ranged 0.56 – 0.70 for phytoplankton and 0.77 – 0.80 for zooplankton indicating a moderate healthier and more diverse aquatic ecosystem. Phytoplankton and zooplankton typically exhibited a clear inverse correlation during various time intervals in different lakes. Sustainable management practices, protection of water quality and habitat preservation are needed in conservation of planktonic communities for maintaining the ecosystem health.
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    Limnological characteristics and fishery resources of Babati and Burunge lakes in Tanzania
    (Animal Research International, 2023) Katonge, Jackson Henry; Kaswamila, Abiud Lucas; Hamisi, Mariam Issa
    A study was conducted in Babati and Burunge lakes in Tanzania to assess the limnological characteristics and fishery resources from August 2022 to March 2023. Sampling was conducted from ten different stations in each lake using standard method ISO 5667-4:1987. 200 fishes representing ten different species were sampled at fishermen landing sites and measured. The results showed no significant difference (p>0.05) in limnological characteristics within seasons and between lakes. Limnological characteristics were within WHO agreed values except biological oxygen demand (10.7 ± 6.43 mg/l), Chloride (31.33 ± 0.88 mg/l), pH (9.8 ± 0.06) and turbidity (51.3 ± 0.88 cm) which were all higher than the accepted values. Chlorophyll-a contents were lower than recommended standard for both lakes in both seasons. Ten fish species were found, six found exclusively in Lake Babati and four in Lake Burunge. Oreochromis niloticus, Oreochromis urolepis and Oreochromis variabilis were restricted to dry season in Lake Babati, while the rest were found in dry and wet seasons in both lakes. Majority of fish species sampled had larger size in the dry than in the wet season. Most fish species sizes were within the reported size ranges for that particular fish species. Clarias gariepinus recorded maximum size (872.3 ± 15.38 g and 54.2 ± 1.96 cm) in Lake Babati, while Tilapia melanopleura recorded maximum size (443.3 ± 6.17 g and 25.7 ± 0.33 cm) in Lake Burunge. The study concluded that both lakes water met the requirements for fish production and requires effective management against pollution.