Threats and Opportunities to Major Rift Valley ¡H Lakes Wetlands of Ethiopia

Gebretsadik, Teklu

doi:10.19080/artoaj.2017.09.555751

Cited by 15 publications

(9 citation statements)

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“…However, recently in Lake Chamo the water quality has drastically altered due to improper land use practices such as fertilizer use, nutrient loading, agricultural activities that causes poor water quality, it is in turn stress on the fishes' body condition (Teffera et al, 2017;Utaile and Sulaiman, 2016). In the same way, the Ethiopian rift valley lakes such as Ziway, Langano, Hawassa, Koka and Beseka are under high human pressure like lake shore farming, destruction of buffer zone, effluent discharges from textile, ceramic and tannery industries drained into water bodies (Gebretsadik and Mereke, 2017;Tesfahun, 2018).…”

Section: Length-weight Relationshipmentioning

confidence: 99%

“…In Lake Beseka, the Nile tilapia had the poorest body condition (0.05) when compared to other water bodies of Ethiopia. Mostly, probably due to the lake becomes shallower and shallower by natural and human induced factors since the lake is one of Ethiopian rift valley lakes and experienced with high salinity, alkaline and sodic water as well as the land use practices near by the lake which are made unsuitable for the Nile tilapia and might result the lowest body condition in the lake (Dinka, 2017;Gebretsadik and Mereke, 2017). When the water salinity alters, fish faced biological aspect problems (lengthweight, maturity and body condition), and physiological changes (oxygen consumption and energy demand) in their environment in which they live.…”

Section: Length-weight Relationshipmentioning

confidence: 99%

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Overview of Length-Weight Relationship, Condition Factor and Size at First Maturity of Nile tilapia Oreochromis niloticus (L.) in Different Water Bodies of Ethiopia: A Review

Tesfahun¹

2018

GJBS

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Length-weight relationship, condition factor and size at first maturity of Nile tilapia Oreochromis niloticus (L.) in different water bodies of Ethiopia have indicated that nearly isometric (b≈3) growth pattern. The Fulton condition factor (K) of O. niloticus was higher in Lake Chamo (2.35) and in Baro River (2.05) than in Gilgel Gibe Reservoir (1.87) and in Lake Langano (1.77). However, it was lowest in Lake Beseka (0.05). Size at first maturity (L50) of O. niloticus was high (42.0 cm TL) for both sexes in Lake Chamo. However, declined in most water bodies of Ethiopia and also exhibits both sexual and seasonal variations. There was variation in size at first maturity with respect to sex in which males had larger size at first maturity than females. Generally, the length-weight relationship, condition factor and size at first maturity of O. niloticus was correlated with availability of food, feeding rate, gonad development, spawning period, water quality parameters can determine the growth rate and the condition of fish and therefore, proper management of this fish stock for conservation and sustainable fishery is critical.

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Section: Length-weight Relationshipmentioning

confidence: 99%

Section: Length-weight Relationshipmentioning

confidence: 99%

Overview of Length-Weight Relationship, Condition Factor and Size at First Maturity of Nile tilapia Oreochromis niloticus (L.) in Different Water Bodies of Ethiopia: A Review

Tesfahun¹

2018

GJBS

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“…The Ethiopian rift valley is a densely populated area with various agroindustry enterprises and mechanized irrigation farms. At the same time, it is one of the most environmentally vulnerable areas in the country [ 20 ]. Diverse groups of economically and ecologically important species of fish are dependant on the lakes.…”

Section: Introductionmentioning

confidence: 99%

Metabarcoding Analyses of Gut Microbiota of Nile Tilapia (Oreochromis niloticus) from Lake Awassa and Lake Chamo, Ethiopia

et al. 2020

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The Nile tilapia (Oreochromis niloticus) gut harbors a diverse microbial community; however, their variation across gut regions, lumen and mucosa is not fully elucidated. In this study, gut microbiota of all samples across gut regions and sample types (luminal content and mucosa) were analyzed and compared from two Ethiopian lakes. Microbiota were characterized using 16S rRNA Illumina MiSeq platform sequencing. A total of 2061 operational taxonomic units (OTUs) were obtained and the results indicated that Nile tilapia from Lake Chamo harbored a much more diversified gut microbiota than Lake Awassa. In addition, the gut microbiota diversity varied significantly across the gut region based on the Chao1, Shannon and Simpson index. The microbiome analyses of all samples in the midgut region showed significantly higher values for alpha diversity (Chao 1, Shannon and Simpson). Beta diversity analysis revealed a clear separation of samples according to sampling areas and gut regions. The most abundant genera were Clostridium_sensu_stricto and Clostridium_XI genera across all samples. Between the two sampling lakes, two phyla, Phylum Fusobacteria and Cyanobacteria, were found to be significantly different. On the other hand, six phyla (Actinobacteria, Bacteroidetes, Chloroflexi, Firmicutes, Proteobacteria and Cyanobacteria) were significantly different across gut regions. In this study, we found that all samples shared a large core microbiota, comprising a relatively large number of OTUs, which was dominated by Proteobacteria, Firmicutes, Cyanobacteria, Fusobacteria and Actinobacteria. This study has established the bases for future large-scale investigations of gut microbiota of fishes in Ethiopian lakes.

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“…The differences in body condition obtained might be due to differences in environmental condition, quantity and quality of food, feeding rate and water level fluctuation. This is because Lake Koka is one of the Ethiopian rift valley lakes under high human pressure, mainly due to the use of the lake for agricultural activities (Gebretsadik and Mereke, 2017). As a result, the water gets shallower and shallower, which is not comfortable for the bottom feeder fishes like L. intermedius.…”

Section: Discussionmentioning

confidence: 99%

Morphometric relationships of African big barb, Labeobarbus intermedius (Rppell, 1836) in Lake Koka, Ethiopia

Tesfahun¹,

Dadebo²,

Temesgen³

2018

Int. J. Fish. Aquac.

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Morphometric relationships of African big barb, Labeobarbus intermedius (Rüppell, 1836) (Pisces:Cyprinidae) in Lake Koka, Ethiopia was studied based on the total number of 266 adult fish samples collected in April-May and July-August 2011. Fish ranging from 23.3 to 49.0 cm in total length (mean=35±4.1) cm and from 95.4 to 1200 g in total weight (mean 434.4±206.5 g) were randomly sampled. Of these, 55.6% (n=148) were males and 44.4% (n=118) were females. The length-weight relationship of the males, females and combined fish were curvilinear and statistically significant (P< 0.01). L. intermedius in Lake Koka has positive allometric growth pattern, which was statistically significantly (p< 0.01). Females were more allometric in their growth pattern, but statistically not significant (P>0.01). Length-length relationships between total length (TL) and fork length (FL), fork length (FL) and standard length (SL), TL and SL were linear and statistically significant (P<0.01). Result of Fulton condition factor showed no significant differences between males and females (P>0.01). The overall condition factor for all sampling period was 1.0.

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Threats and Opportunities to Major Rift Valley ¡H Lakes Wetlands of Ethiopia

Cited by 15 publications

References 0 publications

Overview of Length-Weight Relationship, Condition Factor and Size at First Maturity of Nile tilapia Oreochromis niloticus (L.) in Different Water Bodies of Ethiopia: A Review

Overview of Length-Weight Relationship, Condition Factor and Size at First Maturity of Nile tilapia Oreochromis niloticus (L.) in Different Water Bodies of Ethiopia: A Review

Metabarcoding Analyses of Gut Microbiota of Nile Tilapia (Oreochromis niloticus) from Lake Awassa and Lake Chamo, Ethiopia

Morphometric relationships of African big barb, Labeobarbus intermedius (Rppell, 1836) in Lake Koka, Ethiopia

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