Phytoplankton communities and environmental variables as indicators of ecosystem productivity in a shallow tropical lake

Enawgaw, Yirga; Wagaw, Solomon

doi:10.1080/02705060.2023.2216244

Cited by 7 publications

(2 citation statements)

References 17 publications

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“…Te lake does not have an outlet and receives its water from adjacent watersheds and direct rainfall. Lake Arekit is a productive lacustrine ecosystem that is alkaline, turbid, and rich in nutrients (phosphate and nitrate) [13]. Te watershed of the lake is signifcantly impacted by anthropogenic efects, and eutrophication is brought on by nutrient infuxes.…”

Section: Study Areamentioning

confidence: 99%

Population Dynamics of the Common Carp (Cyprinus carpio L. 1758) Stock in Lake Arekit, Ethiopia: Implications for Management and Conservation

Wagaw,

Enawgaw,

Wendimu

2024

Journal of Applied Ichthyology

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Cyprinus carpio is a widely distributed and commercially important fish species in Ethiopia. Effective management is essential to sustain fisheries and provide benefits to local communities. This study aims to estimate the growth, mortality, and exploitation rate of C. carpio using length-frequency data. A total of 194 C. carpio specimens (117 females and 77 males) were collected between June 2022 and May 2023. The population parameters were determined using FISAT (ELEFAN I) software. The Von Bertalanffy growth function estimations were L∞ = 51.45 cm total length, K = 1.1 year−1; t0 = −0.124 year, and growth performance index (Φ′) = 3.464. The total mortality rate (Z), natural mortality rate (M), and fishing mortality rate (F) were 2.55 year−1, 1.58 year−1, and 0.97 year−1, respectively. The estimated potential longevity (tmax) and average age at which C. carpio attains length at the optimum cohort biomass or yield per recruit (Lopt = 34.79) in Lake Arekit were calculated as 2.60 years and 1.29 years, respectively. The Z/K ratio (2.32), exploitation rate (E = F/Z = 0.38), and highest permissible yield per recruit for C. carpio (Emax = 0.421) suggest enhancing fishery production by increasing the exploitation rate of the underexploited C. carpio in Lake Arekit. The results of this study provide information on the stock of C. carpio, which can be used to guide management efforts. The fish catch in Lake Arkeit is currently far lower than it could be. Therefore, the fish harvest should be boosted through the use of permitted nets, the establishment of groups of fishermen who can catch fish effectively, and the linking of the benefits of fish farming’s supply chain to the potential of fisheries.

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Section: Study Areamentioning

confidence: 99%

Population Dynamics of the Common Carp (Cyprinus carpio L. 1758) Stock in Lake Arekit, Ethiopia: Implications for Management and Conservation

Wagaw,

Enawgaw,

Wendimu

2024

Journal of Applied Ichthyology

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“…This paper presents a new concept of water exchange estimation that has been introduced to analyze hydrologic and anthropogenic transformations in the Uściwierz chain of lakes, located in Eastern Poland. It is very important to accurately assess renewal time because it is regarded as a major factor in influencing the health of aquatic systems, and knowledge of water exchange is required to develop management strategies [26,27]. Moreover, managing water exchange processes can be used as a means of restoration to reduce cyanobacterial blooms and other environmental problems faced by lakes [28].…”

Section: Introductionmentioning

confidence: 99%

Water Renewal Time in Lakes with Transformed Water Distribution in the Catchment Areas

Dawidek,

Ferencz

2024

Water

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Water exchange in lake basins is a very important process in regulating the health of the aquatic environment, e.g., by shaping algal blooms. Thus, knowledge of the process is also required to develop management strategies. The paper presents a dynamic of water renewal time in the Uściwierz chain of lakes, in which the natural hydrological connectivity of the catchment areas has been altered due to human impact. Calculations of water renewal were limited to the part of the lake basin corresponding to the active (dynamic) retention layer. A comparative analysis of the rate of potential water renewal, based on the structure difference index, was used as an indicator of the degree of anthropogenic transformation of water distribution in the lake catchments. The smallest differences in the structure of the water renewal rate between the neighboring lakes in the chain system were observed in the cold period, and the largest differences were observed in the warm period. The results showed that the shorter the timescale (5-day period), the higher the similarity in the structure of the water renewal rate between the lakes. Very large differences between the structure of the potential water renewal rate in Lakes Uściwierz and Bikcze indicated a significant transformation of the water cycle down the lake chain. The water renewal rate proved to be a good indicator of the degree of anthropogenic transformation in the catchments located in close proximity.

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Diel variation of plankton in the highly impacted freshwater zone of Hooghly estuary in relation to ecological alteration

Mohanty,

Das,

Tiwari

et al. 2024

Environ Monit Assess

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Phytoplankton communities and environmental variables as indicators of ecosystem productivity in a shallow tropical lake

Cited by 7 publications

References 17 publications

Population Dynamics of the Common Carp (Cyprinus carpio L. 1758) Stock in Lake Arekit, Ethiopia: Implications for Management and Conservation

Population Dynamics of the Common Carp (Cyprinus carpio L. 1758) Stock in Lake Arekit, Ethiopia: Implications for Management and Conservation

Water Renewal Time in Lakes with Transformed Water Distribution in the Catchment Areas

Diel variation of plankton in the highly impacted freshwater zone of Hooghly estuary in relation to ecological alteration

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