Lake victoria: The water hyacinth (Eichhornia crassipes [Mart.] Solms), its socio-economic effects, control measures and resurgence in the Winam gulf

Opande, George Ogueno; Onyango, John Charles; Wagai, Samuel Otieno

doi:10.1016/s0075-9511(04)80028-8

Cited by 70 publications

(48 citation statements)

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“…According to Opande et al [20] when water hyacinth infestation is present, access to fishing sites become difficult for riparian communities which rely solely on fishing as their main economic activity. Similarly, a study by Frezina [6] also reported that water hyacinth can present many problems for the fishers.…”

Section: Effects Of Water Hyacinth Expansion On Fishing Activitiesmentioning

confidence: 99%

“…In the area of severe infestation, especially around the shore area fishing is therefore too much difficult. This results in blockage of fish landing sites and destruction of fishing gear [20]. Hence, as much as water hyacinth is viewed; it has had a negative impact on fishing, as it causes difficulty in fishing [21].…”

Section: Effects Of Water Hyacinth Expansion On Fishing Activitiesmentioning

confidence: 99%

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Current Trend of Water Hyacinth Expansion and Its Consequence on the Fisheries around North Eastern Part of Lake Tana, Ethiopia

Asmare¹

2017

J Biodivers Endanger Species

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The study was conducted from June, 2015 to October, 2016 to assess the effect of water hyacinth on fishing and fishers around the North-Eastern part of Lake Tana. The presence of water hyacinth in Lake Tana has been recognized in 2011. Starting from the last five years, especially after 2014, fishing in the study area becomes tiring due to the expansion of this invasive weed. Water hyacinth entangles the fishing nets and boats' propeller, making it difficult to fish and resulting in reduced fish catches. Hence, a reduced fish catch would have an adverse effect on the quality of life of the communities around the lake and consequently affect sustainable development in the region. Despite the fact that several efforts have been made by different parties, water hyacinth in Lake Tana continues to expand itself year after year. Therefore, o its expansion is not easy to manage and complete eradication is unimaginable. Therefore, if the expansion of water hyacinth continues in this trend, it can negatively affect the livelihood of fishers in both directions by increasing costs of fishing and reducing the amount of fish caught.

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Section: Effects Of Water Hyacinth Expansion On Fishing Activitiesmentioning

confidence: 99%

Section: Effects Of Water Hyacinth Expansion On Fishing Activitiesmentioning

confidence: 99%

Current Trend of Water Hyacinth Expansion and Its Consequence on the Fisheries around North Eastern Part of Lake Tana, Ethiopia

Asmare¹

2017

J Biodivers Endanger Species

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“…Water hyacinth is a common noxious aquatic weed that constitute environmental nuisance to rivers and aquatic life. The leaves have coating of wax over the entire surface to prevent it from getting wet (Opande and Onyang, 2004). The plant shows dense growth which prevents the entry of light below it and therefore adversely affects all the aquatic life in water in which it grows.…”

Section: Introductionmentioning

confidence: 99%

Kinetics of Biogas Production from a Mixture of Water Hyacinth (Eichornia Crassipes) and Fresh Rumen Residue

Ehiri¹,

Ikelle²,

Mgbabor³

et al. 2014

IOSRJAC

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“…[3] when all the conditions suitable for growth were fulfilled, two single parents were surrounded by 300 offspring's in 23 days and by 1200 in 4 months [3]. Such a spontaneous spread results in the creation of free floating carpets that get translocated from place to place by the wind action [1]. The floating islands were reported to affect biodiversity, transport, fisheries, macrophyte recovery and water treatment plants in the Winam gulf [1] among other problems, and a resurgence reported after an initially successful biocontrol exercise in the Winam gulf .…”

mentioning

confidence: 99%

“…Such a spontaneous spread results in the creation of free floating carpets that get translocated from place to place by the wind action [1]. The floating islands were reported to affect biodiversity, transport, fisheries, macrophyte recovery and water treatment plants in the Winam gulf [1] among other problems, and a resurgence reported after an initially successful biocontrol exercise in the Winam gulf . Recently incidence of boat traffic being stranded within these carpets were reported thereby leading to possible lose of life or property [4]; [5] leading to a study question (1) Can a human being or a small animal walk on these carpets to safety?…”

mentioning

confidence: 99%

Carpet Characteristics of Eichhornia Crassipes [Mart.] Solms (Water hyacinth) in the Winam Gulf (Lake Victoria, Kenya)

Opande

Otieno

Charles

et al. 2017

Journal of Asian Scientific Research

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Article HistoryThe occurrence and spread of the water hyacinth (Eichhornia crassipes [Mart.] Solms), in the Winam gulf has created numerous attributes to the human population that live around the lake, thereby making its control a priority. Navigation within the lake is a major economic activity that has been greatly affected. Before this study, little was known about the characteristics of these weed carpets, and specifically the weight that a healthy inter-connected or entangled carpet can support before it was able to sink or even get submerged. Can a light herbivore or human stranded in the lake walk on a healthy carpet to safety?. In order to better understand these unknown, a study was initiated at five locations (i.e; Dunga beach, Kisumu pier, Kusa, Kobala and Kendu bay) within the lake that appeared to contain healthy dense carpets. Carpet connectivity, mat buoyancy, distribution of mass, biomass density, rhizome length and population density were calculated. Carpet connectivity was determined as the difference in pressure when weights were added on a mesh wire measuring 0.434m2 until the carpet submerged and the pressure on the same carpet that was required to submerge it after a complete disconnection. Standing population density was determined by counting the number of plants found within quadrants measuring 1 m2; while biomass density was determined when oven dried plant materials collected from quadrants measuring 1 m2 was weighed. Plant mass and rhizome length measurements were correlated, while population density was correlated to biomass density. These observations show that water hyacinth distribution in the Winam gulf is seasonal and adopts residence in secluded bays, carpets measuring 0,434m2 in size that have a connectivity of 288.4 Pa (pascals) are able to support a weight of only 12.6 kg, with any additional weight causing them to submerge. Distribution of mass was normal except in locations that are subjected to external factors.

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Lake victoria: The water hyacinth (Eichhornia crassipes [Mart.] Solms), its socio-economic effects, control measures and resurgence in the Winam gulf

Cited by 70 publications

References 0 publications

Current Trend of Water Hyacinth Expansion and Its Consequence on the Fisheries around North Eastern Part of Lake Tana, Ethiopia

Current Trend of Water Hyacinth Expansion and Its Consequence on the Fisheries around North Eastern Part of Lake Tana, Ethiopia

Kinetics of Biogas Production from a Mixture of Water Hyacinth (Eichornia Crassipes) and Fresh Rumen Residue

Carpet Characteristics of Eichhornia Crassipes [Mart.] Solms (Water hyacinth) in the Winam Gulf (Lake Victoria, Kenya)

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