Water quality, phytoplankton composition and microcystin concentrations in Kisumu Bay (Kenya) of Lake Victoria after a prolonged water hyacinth infestation period

2021 ◽  
Author(s):  
Jared Babu Miruka ◽  
Albert Getabu ◽  
Lewis Sitoki ◽  
Onchieku James ◽  
Job Mwamburi ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Hyacinth ◽  
Lake Victoria ◽  
Phytoplankton Composition

Water Hyacinth (Eichhornia crassipes) infestation, interactions with nutrients, aquatic biota and a control weevil in Winam Gulf, Lake Victoria, Kenya

2019 ◽  
Author(s):  
DENNIS OTIENO ◽  
Nyaboke Hilda ◽  
Nyamweya Chrispine ◽  
Cyprian Odoli ◽  
Christopher Aura ◽  
...  
Keyword(s):  
Water Quality ◽  
Water Hyacinth ◽  
Lake Victoria ◽  
Soluble Reactive Phosphorus ◽  
R Package ◽  
Abiotic Factor ◽  
Economic Activities ◽  
Fish Samples ◽  
Winam Gulf ◽  
The Government

Lake Victoria just like many other lakes is affected by water hyacinth which resides in several bays for the better part of the year. This weed affects several economic activities of the locals and denies the government revenue every year from blue economic activities related to the lake. This paper explores the interaction of water hyacinth with biotic and abiotic factor and the efficiency of the introduced weevils in its control with an aim of advising on the best way to tackle the menace of the weed. Water quality samples were collected and compared from the time of water hyacinth arrival and sinking within Winam gulf. Water hyacinth was collected and damages resulting from the weevils as well as the number of weevils recorded. Fish samples were also collected using experimental gill nets. Water quality was analyzed for Ammonium, Soluble Reactive Phosphorus, Nitrates and Nitrates. Data was then analyzed using R- package. Results indicated that the weevils inhibits nutrient uptake by17% within the first four weeks, hyacinth increase the nutrient levels in the gulf almost three fold after decaying and sinking. Weevils also increased the sinking rate of water hyacinth through destruction of the petioles and leaves. There was a significantly higher fish numbers during the weed infestation than when the weed was absent. In conclusion water hyacinth impacts both biotic and abiotic factor and the weevils alone cannot be depended upon to eradicate the weed.

Interaction of water hyacinth with biotic and abiotic factor and the biological agents efficiencies in its control in Winam gulf, lake Victoria Kenya

2019 ◽  
Author(s):  
DENNIS OTIENO ◽  
Dickson Owage ◽  
John Ouko ◽  
James Achiya ◽  
Josephat Mwanchi
Keyword(s):  
Water Quality ◽  
Water Hyacinth ◽  
Lake Victoria ◽  
Biological Agents ◽  
Abiotic Factor ◽  
Economic Activities ◽  
Biotic Factor ◽  
Fish Samples ◽  
Winam Gulf ◽  
The Government

Lake Victoria just like many lakes across the world is effected with water hyacinth which resides in several bays for the better part of the year thus affect several economic activities of the locals and denies the government revenue every year from blue economic activities related to the lake. This paper explores the Interaction of water hyacinth with biotic and a biotic factor and the efficiency of the introduced biological agents (Neochetina eichhorniae and N. bruchi) in its control with an aim of advising on the best way to tackle the menace of the weed. Water quality samples were collected and compared from the time of water hyacinth arrival and sinking within winum gulf, this was divided in three phase, the hyacinth was collected and damages resulting from the weevils recorded. Fish samples were also collected using experimental gill nets and number recorded in Ms excel during the presence and absence of the weed. Water quality was analyzed for ammonium, SRP, nitrates and nitrates using SOP. The weevils were counted manually from each hyacinth collected and the data recorded. Data was then analyzed using R-data analysis at P<0.05 and post hock test to determine significance where applicable. Results indicated that the weevils inhibits nutrient uptake by17% within four weeks, hyacinth increase the nutrient levels in the gulf almost three fold after decaying and sinking and a notable interaction with biotic and a biota factor was also recorded. In conclusion water hyacinth impacts both biotic and a biotic factor and the weevils alone can not be depended upon to eradicate the weed.

PENGARUH KONDISI EKOSISTEM DARAT KORIDOR SUNGAI TERHADAP DANAU RAWA PENING

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
E. Hanggari Sittadewi
Keyword(s):  
Water Quality ◽  
Water Hyacinth ◽  
River Corridors ◽  
River Corridor ◽  
Environment Degradation

Environment degradation in Rawa Pening’s lake is caused of descend lake’s functions for some potentions and activities around the lake. Some problems in the Rawa Pening’s lake has emerged i.e : decrease water quality of lake, abundance of water hyacinth growth and increase sediment in the bottom lake. A research about infl uences of land ecosystem on Panjang and Galeh river corridors for Rawa Pening’s lake has been done. Two rivers named Galeh and Panjang are the largest water contribution in Rawa Pening’s lake. That caused the land characteristic ecosystem of that river corridors gives infl uences in the Rawa Pening’s lake.Key words: land ecosystem, river corridor, water contribution, Rawa Pening Lake.

scholarly journals KAJIAN KUALITAS PERAIRAN UNTUK PERIKANAN DI RAWA PENING JAWA TENGAH

2017 ◽  
Vol 8 (3) ◽  
pp. 173
Author(s):  
Siti Nurul Aida ◽  
Agus Djoko Utomo
Keyword(s):  
Water Pollution ◽  
Water Quality ◽  
Trophic Level ◽  
Carrying Capacity ◽  
Water Hyacinth ◽  
Trophic State ◽  
Fish Growth ◽  
Household Waste ◽  
Trophic State Index ◽  
State Index

Perairan Rawa Peningmerupakan tipe perairan yang tergenang dan mempunyai arti penting bagi perikanan. Masalah utama yang ada di Rawa Pening yaitu pendangkalan karena sedimentasi dan eutrofikasi yang disebabkan pencemaran air berasal dari limbah rumah tangga, pertanian dan budidaya perikanan. Penelitian ini bertujuan untukmengetahui tingkat kesuburan perairan dan kualitas air di Rawa Pening. Penelitian dilakukan pada bulan Mei, Juni, Agustus dan Oktober 2013. Frekuensi pengambilan contoh dilakukan empat kali yaitu pada bulan Mei, Juni,Agustus dan Oktober. Stasiun pengamatan meliputi:A. Tengah (Puteran); B.Muara sungai (Torong); C.Area KJA; D. Pemotongan eceng Gondok (tengah 1); E. Sungai keluar (Tuntang); F. Muara sungai (Muncul); G. Tidak ada pemotongan eceng gondok (tengah 2). Data tingkat kesuburan perairan dianalisis dengan metode Carlon’s.Hasil penelitianmenunjukkan bahwa Rawa Pening termasuk katagori perairan dengan tingkat kesuburan tinggi, nilai Thropic State Index (TSI) pada semua stasiun pengamatan berkisar antara 57,22 - 68,06. Kondisi kualitas air yang kurang baik tersebut akanmerugikan perikanan, seperti kejadian kematian ikanmasal, lambatnya pertumbuhan ikan dan penurunan daya dukung perairan.The Rawa Pening waters is a lentic water and has significance for fishery. The main problems in Rawa Pening are silting due to sedimentation and eutrophication due to water pollution from household waste, agriculture and fisheries. The study aims to examine trophic level and water quality. The research conducted on May, June, August and October 2013. There was 7 stations i.e. A. middle (Puteran); B. inlet of Torong; C. Location of aquaculture;D. locations where harvesting of water hyacinth occurred (middle1); E. outlet (Tuntang); F. inlet (Muncul); G. location where no harvest of water hyacinth (middle 2). Trophic level were analyzed by Carlon’s method. The results showed that Rawa Pening waters categorized as the high eutrophication level where the Trophic State Index (TSI) was 57. 22 to 68. 06. The low water quality will be detrimentaled to fisheries, such as mass fish death, slow fish growth and also a decline of carrying capacity of ecosystem.

scholarly journals Summer aspect of phytoplankton communities in some Montenegrin lakes: Are there changes after more than two decades?

2012 ◽  
Vol 64 (2) ◽  
pp. 745-755
Author(s):  
Jelena Rakocevic
Keyword(s):  
Water Quality ◽  
Sustainable Management ◽  
Aquatic Ecosystems ◽  
Phytoplankton Community ◽  
Management Plan ◽  
Phytoplankton Composition ◽  
Qualitative And Quantitative ◽  
Environmental Monitoring System ◽  
Phytoplankton Communities ◽  
Second Period

Qualitative and quantitative phytoplankton compositions of 10 Montenegrin lakes were investigated in the summer of 2007. The obtained results were compared with a previous study-period that was undertaken two decades ago. In the first period, diatoms numerically dominated the phytoplankton community in all studied lakes, while in the second period, the same was observed only in three of the ten lakes; in other studied lakes the relative contributions of green algae, dinoflagellates and/or cyanobacteria increased, while the contribution of diatoms decreased. The shift observed in phytoplankton composition and diversity in some of the studied lakes indicates an increase in the trophic level over the two decades. The sustainable management plan of the aquatic ecosystems in Montenegro should include the establishment of an environmental monitoring system in order to record any alterations that may take place in water quality.

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