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  • Articles  (5)
  • Phytoplankton  (3)
  • By catch  (2)
  • WIOMSA  (4)
  • American Association for the Advancement of Science
  • American Institute of Physics
  • Annual Reviews
  • Nature Publishing Group
  • Wiley
  • 2005-2009  (5)
  • 1990-1994
  • 1980-1984
  • 1960-1964
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  • Articles  (5)
Years
  • 2005-2009  (5)
  • 1990-1994
  • 1980-1984
  • 1960-1964
  • 2020-2023  (1)
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  • 1
    Publication Date: 2021-05-19
    Description: Samples were collected monthly at four fixed stations in Mida creek from May 1996 to April 1997, in order to determine the species composition, abundance and diversity of phytoplankton and zooplankton collected with 20- and 332-mm mesh size plankton nets respectively. Sampling also included measurement of salinity and temperature. Peaks in phytoplankton abundance occurred in May and January, following the long rains in April–May and the short rains in November–December. Zooplankton densities followed the phytoplankton peaks with the main peak occurring in February after the major phytoplankton bloom. Similarly, smaller peaks occurred in May and March. Copepods dominated the zooplankton forming up to 60% of total species composition. High zooplankton diversity occurred in June–July when zooplankton abundance was lowest as compared to February–March. Spatially, the highest diversity was recorded at station 1 located towards the open sea as compared to the other stations located farther inshore.
    Description: Published
    Keywords: Zooplankton ; Midacreek ; Phytoplankton ; Abundance ; Kenya ; Zooplankton
    Repository Name: AquaDocs
    Type: Journal Contribution , Refereed , Article
    Format: 232203 bytes
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  • 2
    Publication Date: 2021-05-19
    Description: Surveys of naturally-occurring live food for fish in Makoba earthen ponds, Zanzibar were conducted from November 2001 to August 2002. This involved identification of dominant plankton in the water column as well as the composition of algal mats. The effect of nutrients on the composition and abundance of the organisms was also assessed. Protozoa were found to be the dominant zooplankton in the water column, followed by rotifers. The most abundant phytoplankton genera were Prorocentrum (13.4%), followed by Coscinodiscus (10.4%) and Diplopsalopsis (7.5%), while the benthic algal mats were dominated by cyanobacteria, mostly Spirulina (22%) and Oscillatoria (18.4%). To complement the surveys, a time-series experiment was conducted for 21 consecutive days to assess the dynamics of plankton in earthen ponds and simulation containers, using a fertilisation rate of 83 kg dry matter/ha/day. Protozoa were the most dominant zooplankton in the earthen ponds. Fertilisation with chicken manure was effective in increasing the number of rotifers in simulation containers, but not in the earthen ponds; this was probably because, unlike the earthen ponds, the simulation containers were sheltered from external influences such as rain, flooding by tide water, etc. The phytoplankton genera Pyramimonas (16.7%), Biddulphia and Microcystis (8.3%) dominated the fertilised ponds. Chlorophyll-a concentration ranged from 1.8 to 16.9 mg/l, whereas soluble reactive phosphorous (SRP) and ammonia-N reached maximum concentrations of 1.4 mg-at.P/l and 9.7 mg-at.N/l respectively. Overall, salinity and fertilisation played a major role in controlling the abundance of live/natural food in the system.
    Description: Published
    Description: Rotifers
    Keywords: Prorocentrum ; Coscinodiscus ; Diplopsalopsis ; Spirulina ; Oscillatoria ; Pyramimonas ; Biddulphia ; Microcystis ; Fish ponds ; Fishery management ; Phytoplankton ; Protozoan diseases ; Fish farms ; Fertilization (biological)
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 3
    Publication Date: 2021-05-19
    Description: 1. Seahorses (Hippocampus spp.), many of which are listed as Vulnerable or Endangered on the IUCN Red List, are traded worldwide as souvenirs, aquarium fish and, primarily, for use in traditional medicines. Given concern over the sustainability of this trade, the genus was added to Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) in May 2004. 2. This paper reports findings of the first ever survey of seahorse trade in Africa, conducted in Kenya and Tanzania in May and June 2000. 3. Seahorse trade in Kenya was found to be negligible, with approximately 10 live seahorses exported as aquarium fish annually. Until 1998, however, Kenya may have imported somewhere from 1 to 2.3 t of dried seahorses annually from Tanzania for re-export to Asian medicine markets. Seahorse trade in Tanzania remained substantial, with at least 630–930 kg of dried seahorse exported directly to Asia each year. 4. Accounts of declines in seahorse availability and seahorse size, although few in number, could be early warning signs that wild populations are suffering, at least locally. Close monitoring of future developments in the trade will be essential to allow for timely conservation action as and when necessary, and would contribute to our understanding of the ecological and economical implications of small-scale, non-food fisheries. Copyright # 2004 John Wiley & Sons, Ltd.
    Description: Published
    Keywords: Hippocampus spp ; By catch ; Non-food fisheries ; Seahorse trade ; Endangered species ; Aquatic animals
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 4
    Publication Date: 2021-05-19
    Description: Incidental catches (bycatch) in gillnet fisheries off Zanzibar (Unguja Island), as a source of mortality among several species of dolphins, were reported in a questionnaire survey conducted in 1999. As a follow-up to that survey, from January 2000 to August 2003, we monitored the incidental catches of dolphins collected from 12 fish landing sites. Six species of dolphins were recorded from 143 specimens retrieved from bycatches in drift- and bottom set gillnets. Of these, 68 (48%) were Indo-Pacific bottlenose dolphins (Tursiops aduncus), 44 (31%) spinner dolphins (Stenella longirostris), 12 (8%) Risso’s dolphins (Grampus griseus), 11 (8%) Indo-Pacific humpback dolphins (Sousa chinensis), 6 (4%) Pan-tropical spotted dolphins (Stenella attenuata) and 2 (1%) common bottlenose dolphins (Tursiops truncatus). Most of the bycatches (71%) were in nets set off the north coast of Unguja Island. In this paper, bycatch records are examined to describe the occurrence and distribution of dolphin species in Unguja Island coastal waters. The relatively large numbers of bycatch dolphins recorded indicate that bycatch may be a potential threat to local populations that need to be addressed in future conservation and management efforts in the region.
    Description: Published
    Description: Stenella longirostris; Grampus griseus; Sousa chinensis; Stenella attenuata; Tursiops truncatus; occurrence; dolphins
    Keywords: Distribution ; By catch ; Distribution ; Gillnets
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
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  • 5
    Publication Date: 2021-05-19
    Description: Surface water concentrations of inorganic nutrients and suspended particulate matter (SPM) components from Mtwapa and Shirazi creeks in Kenya were measured and compared. This was aimed at assessing the contribution of phytoplankton carbon, particulate organic carbon (POC) and detritus on the total SPM pool, and the influence of sewage discharge on these components of SPM. The results obtained were compared with those from Ramisi, an estuarine system. Using PCA and cluster analysis, three clear clusters of stations were obtained. The two creek systems (Mtwapa and Shirazi) were separated into two distinct clusters. The cluster comprising five stations in Mtwapa and four in Shirazi was characterised by high levels of POC: phytoplankton carbon ratio and to a lesser extent by pennate diatom stocks. All stations from Ramisi estuary were clustered together and were characterised by high concentrations of phytoplankton carbon, centric diatoms, dry weight, POC and detritus. A third cluster, comprised of two stations in Mtwapa, was characterised by high numbers of dinoflagellates. From the results obtained, detritus forms the main source of POC in the three sites; it accounts for a mean of 61% ± 20 in Ramisi, 97% ± 0.7 in Shirazi and 65% ± 29 in Mtwapa. These high detritus levels are expected because of the allochthonous supply of particulate material by the river in Ramisi and the contribution from mangroves, which fringe the banks of the estuary and the creeks.
    Description: Published
    Keywords: Suspended particulate matter ; Particulate organic carbon ; Detritus ; Nutrients ; Surface water ; Phytoplankton ; Components
    Repository Name: AquaDocs
    Type: Journal Contribution , Non-Refereed , Article
    Format: 260480 bytes
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