Abundance, length-weight relationship and breeding season of &lt;i&gt;Clarias gariepinus &lt;/i&gt; (Teleostei: Clariidae) in Lake Tana, Ethiopia

Ameha, Abebe; Abdissa, Belay; Mekonnen, Tariku

doi:10.4314/sinet.v29i2.18274

Cited by 2 publications

(6 citation statements)

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“…This is in line with another similar study [42]. The definition of life histories of indicator fish species sensitive to hydrologic alterations in the study area is based on the literature [22,[30][31][32]45,[51][52][53][54][55][56] (Table 4). An overlay graph, Figure 13, depicts periods of fish spawning migration and reproduction with the percentile flows of Gumara river classified into different ecologically relevant flow components.…”

Section: Flow Components and Needssupporting

confidence: 81%

“…However, some fish species, such as B. humilis and B. tanapelagious, stay in the littoral zone of the lake for reproduction [45]. As studies indicated, among commercially important migratory fishes of Lake Tana like C. gariepinus (cat fish), the major breeding season extends from April to July [51] (Table 4 and Figure 13). C. gariepinus requires the seasonal flow to emigrate from the Lake to the flood plain wetlands of Shesher and Welala via Gumara River to start the spawning.…”

Section: Sn Fish Speciesmentioning

confidence: 99%

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Hydrological Foundation as a Basis for a Holistic Environmental Flow Assessment of Tropical Highland Rivers in Ethiopia

Abebe

Tilahun

Moges

et al. 2020

Water

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The sustainable development of water resources includes retaining some amount of the natural flow regime in water bodies to protect and maintain aquatic ecosystem health and the human livelihoods and wellbeing dependent upon them. Although assessment of environmental flows is now occurring globally, limited studies have been carried out in the Ethiopian highlands, especially studies to understand flow-ecological response relationships. This paper establishes a hydrological foundation of Gumara River from an ecological perspective. The data analysis followed three steps: first, determination of the current flow regime—flow indices and ecologically relevant flow regime; second, naturalization of the current flow regime—looking at how flow regime is changing; and, finally, an initial exploration of flow linkages with ecological processes. Flow data of Gumara River from 1973 to 2018 are used for the analysis. Monthly low flow occurred from December to June; the lowest being in March, with a median flow of 4.0 m3 s−1. Monthly high flow occurred from July to November; the highest being in August, with a median flow of 236 m3 s−1. 1-Day low flows decreased from 1.55 m3 s−1 in 1973 to 0.16 m3 s−1 in 2018, and 90-Day (seasonal) low flow decreased from 4.9 m3 s−1 in 1973 to 2.04 m3 s−1 in 2018. The Mann–Kendall trend test indicated that the decrease in low flow was significant for both durations at α = 0.05. A similar trend is indicated for both durations of high flow. The decrease in both low flows and high flows is attributed to the expansion of pump irrigation by 29 km2 and expansion of plantations, which resulted in an increase of NDVI from 0.25 in 2000 to 0.29 in 2019. In addition, an analysis of environmental flow components revealed that only four “large floods” appeared in the last 46 years; no “large flood” occurred after 1988. Lacking “large floods” which inundate floodplain wetlands has resulted in early disconnection of floodplain wetlands from the river and the lake; which has impacts on breeding and nursery habitat shrinkage for migratory fish species in Lake Tana. On the other hand, the extreme decrease in “low flow” components has impacts on predators, reducing their mobility and ability to access prey concentrated in smaller pools. These results serve as the hydrological foundation for continued studies in the Gumara catchment, with the eventual goal of quantifying environmental flow requirements.

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Section: Flow Components and Needssupporting

confidence: 81%

Section: Sn Fish Speciesmentioning

confidence: 99%

Hydrological Foundation as a Basis for a Holistic Environmental Flow Assessment of Tropical Highland Rivers in Ethiopia

Abebe

Tilahun

Moges

et al. 2020

Water

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“…Gonad maturity stages of the Labeobarbus fish species were given a seven level stage (I-VII) as shown in Table 1. Therefore, the breeding seasons of fishes were estimated from the percentages of fish with ripe gonads obtained each month (Ameha et al, 2006;Dadebo, 2000). However, ripe gonads were observed throughout the year.…”

Section: Literature Reviewmentioning

confidence: 99%

“…The fish also breeds intensively at April, as well as occurred in June-July than in April. In Lake Tana, the spawning season of C. gariepinus ranged between April and July (Ameha et al, 2006). According to Ameha (2006) and Tweddle (1978) the river mouths serve as sites for the breeding as this fish migrates to nearby floodplains during rainy time for the purpose of reproduction.…”

Section: IImentioning

confidence: 99%

“…Reproductive biology of each fish species is critical for the conservation and fish resource management. For this reason, considerable studies were conducted in Ethiopian water bodies for fishery resources management and conservation (Abera, 2012;Admassu et al, 2015;Ameha et al, 2006;Dadebo, 2000;Dabebo et al, 2011;Degefu et al, 2012;Gebremedhin et al, 2014;Hailu, 2013;Hirpo, 2012Hirpo, , 2013. Fishes are important source of omega-3 fatty acid and it is required to support an ever increasing human population particularly in Ethiopia.…”

Section: Introductionmentioning

confidence: 99%

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Breeding seasons of some commercially important fishes in Ethiopia: Implications for fish management

Tesfahun¹

2019

Sci. Res. Essays

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Fishing during periods close to spawning (breeding) season results in a decline in fish population. Identifying the breeding season of each fish species is important for conservation and aquaculture development. Published and unpublished sources of data were used to prepare this review manuscript. Based on the review process, it is possible to observe that the breeding season of fish occurred all year round. Although, the intensive or peak breeding period occurred uni-annual or bi-annual and also it is different from the fish species as well as the nature of water bodies. The peak breeding seasons of the African catfish Clarias gariepinus was observed from (

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Abundance, length-weight relationship and breeding season of <i>Clarias gariepinus </i> (Teleostei: Clariidae) in Lake Tana, Ethiopia

Cited by 2 publications

References 0 publications

Hydrological Foundation as a Basis for a Holistic Environmental Flow Assessment of Tropical Highland Rivers in Ethiopia

Hydrological Foundation as a Basis for a Holistic Environmental Flow Assessment of Tropical Highland Rivers in Ethiopia

Breeding seasons of some commercially important fishes in Ethiopia: Implications for fish management

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