EdenteV2, Main, Exploration, bibRecord, 005A58

Some aspects of the biology of the stargazer mountain catfish, Amphilius uranoscopus (pfeffer); (Siluriformes: Amphiliidae) indigenous to Kenya streams

Identifieur interne : 005A58 ( Main/Exploration ); précédent : 005A57; suivant : 005A59

Some aspects of the biology of the stargazer mountain catfish, Amphilius uranoscopus (pfeffer); (Siluriformes: Amphiliidae) indigenous to Kenya streams

Auteurs : Charles C. Ngugi [Kenya] ; Julius O. Manyala [Kenya] ; Murithi Njiru [Kenya] ; Chrisestom M. Mlewa [Kenya]

Source :

African Journal of Ecology [ 0141-6707 ] ; 2009-12.

RBID : ISTEX:2BE4AF5AFEB0F97A2C32F4BF00D38C6C4A770F98

Descripteurs français

Wicri :
- geographic : Kenya.

English descriptors

Abstract

A study on some biological parameters of the mountain catfish, Amphilius uranoscopus Pfeffer 1889 (Silurifomes: Amphiliidae), was carried out in the Thego stream on the slopes of Mount Kenya from February to December 2002. Physical and chemical profiles of the Thego show that the water quality parameters is typical of high altitude streams with temperatures rarely exceeding 18°C, DO ranging from 7.9 to 8.2 mg l−1 and relatively high conductivity (97–137 μS cm−1) typical of perturbed lotic environments. A total of 1010 fish were caught by an electro‐fisher, with sizes ranging between 8 and 24 cm fork length. The population structure had a unimodal distribution with maxima at 14–16 cm. The length–weight relationship showed relatively narrow range in the slope ranging from 2.61 in April to 2.98 in February 2002, thereby suggesting isometric growth pattern. The fitted growth pattern of A. uranoscopus showed an asymptotic length (L∞) of 28.5 cm and a growth curvature (K) of 0.56 year−1 resulting in an estimated natural mortality coefficient (M) of 0.90 year−1. The Fulton’s condition factor (K) was also relatively stable with a peak in April (0.92 ± 0.21) and lowest value in June (0.86 ± 0.10). As A. uranoscopus is not under commercial exploitation, the seemingly depressed population is possibly attributed to the introduced exotic rainbow trout that heavily predates on the species and environmental perturbations arising from changes in land use. The implications of such changes on A. uranoscopus are discussed.

Url:

https://api.istex.fr/document/2BE4AF5AFEB0F97A2C32F4BF00D38C6C4A770F98/fulltext/pdf

DOI: 10.1111/j.1365-2028.2009.01032.x

Affiliations:

Kenya

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Le document en format XML

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<term>Amphilius uranoscopus</term>
<term>April</term>
<term>Aquatic sciences</term>
<term>Asymptotic length</term>
<term>August</term>
<term>Blackwell publishing</term>
<term>Body weight</term>
<term>Brown trout</term>
<term>Condition factor</term>
<term>December</term>
<term>East africa</term>
<term>Ecol</term>
<term>Environmental conditions</term>
<term>Exotic rainbow trout</term>
<term>February</term>
<term>Females males</term>
<term>Fish biol</term>
<term>Fork length</term>
<term>Gonad weight</term>
<term>Growth curvature</term>
<term>Growth parameters</term>
<term>Growth performance</term>
<term>Hauer lamberti</term>
<term>Headwater streams</term>
<term>High conductivity</term>
<term>High silt load</term>
<term>Journal compilation</term>
<term>Kenya</term>
<term>Kenya streams</term>
<term>Mountain populations</term>
<term>Moyle cech</term>
<term>Multiple comparison</term>
<term>Native species</term>
<term>Natural mortality</term>
<term>Ngugi</term>
<term>Oncorhynchus mykiss</term>
<term>Other months</term>
<term>Population sizes</term>
<term>Rainbow trout</term>
<term>Skelton</term>
<term>Southern africa</term>
<term>Specimens bmnh</term>
<term>Stargazer mountain</term>
<term>Summary data</term>
<term>Surface velocity</term>
<term>Tana river</term>
<term>Thego</term>
<term>Thego river</term>
<term>Thego stream</term>
<term>Trout</term>
<term>Uranoscopus</term>
<term>Water streams</term>
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<term>Amphilius</term>
<term>Amphilius uranoscopus</term>
<term>April</term>
<term>Aquatic sciences</term>
<term>Asymptotic length</term>
<term>August</term>
<term>Blackwell publishing</term>
<term>Body weight</term>
<term>Brown trout</term>
<term>Condition factor</term>
<term>December</term>
<term>East africa</term>
<term>Ecol</term>
<term>Environmental conditions</term>
<term>Exotic rainbow trout</term>
<term>February</term>
<term>Females males</term>
<term>Fish biol</term>
<term>Fork length</term>
<term>Gonad weight</term>
<term>Growth curvature</term>
<term>Growth parameters</term>
<term>Growth performance</term>
<term>Hauer lamberti</term>
<term>Headwater streams</term>
<term>High conductivity</term>
<term>High silt load</term>
<term>Journal compilation</term>
<term>Kenya</term>
<term>Kenya streams</term>
<term>Mountain populations</term>
<term>Moyle cech</term>
<term>Multiple comparison</term>
<term>Native species</term>
<term>Natural mortality</term>
<term>Ngugi</term>
<term>Oncorhynchus mykiss</term>
<term>Other months</term>
<term>Population sizes</term>
<term>Rainbow trout</term>
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<term>Specimens bmnh</term>
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<term>Summary data</term>
<term>Surface velocity</term>
<term>Tana river</term>
<term>Thego</term>
<term>Thego river</term>
<term>Thego stream</term>
<term>Trout</term>
<term>Uranoscopus</term>
<term>Water streams</term>
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<front><div type="abstract" xml:lang="en">A study on some biological parameters of the mountain catfish, Amphilius uranoscopus Pfeffer 1889 (Silurifomes: Amphiliidae), was carried out in the Thego stream on the slopes of Mount Kenya from February to December 2002. Physical and chemical profiles of the Thego show that the water quality parameters is typical of high altitude streams with temperatures rarely exceeding 18°C, DO ranging from 7.9 to 8.2 mg l−1 and relatively high conductivity (97–137 μS cm−1) typical of perturbed lotic environments. A total of 1010 fish were caught by an electro‐fisher, with sizes ranging between 8 and 24 cm fork length. The population structure had a unimodal distribution with maxima at 14–16 cm. The length–weight relationship showed relatively narrow range in the slope ranging from 2.61 in April to 2.98 in February 2002, thereby suggesting isometric growth pattern. The fitted growth pattern of A. uranoscopus showed an asymptotic length (L∞) of 28.5 cm and a growth curvature (K) of 0.56 year−1 resulting in an estimated natural mortality coefficient (M) of 0.90 year−1. The Fulton’s condition factor (K) was also relatively stable with a peak in April (0.92 ± 0.21) and lowest value in June (0.86 ± 0.10). As A. uranoscopus is not under commercial exploitation, the seemingly depressed population is possibly attributed to the introduced exotic rainbow trout that heavily predates on the species and environmental perturbations arising from changes in land use. The implications of such changes on A. uranoscopus are discussed.</div>
</front>
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<tree><country name="Kenya"><noRegion><name sortKey="Ngugi, Charles C" sort="Ngugi, Charles C" uniqKey="Ngugi C" first="Charles C." last="Ngugi">Charles C. Ngugi</name>
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<name sortKey="Manyala, Julius O" sort="Manyala, Julius O" uniqKey="Manyala J" first="Julius O." last="Manyala">Julius O. Manyala</name>
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<name sortKey="Njiru, Murithi" sort="Njiru, Murithi" uniqKey="Njiru M" first="Murithi" last="Njiru">Murithi Njiru</name>
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Some aspects of the biology of the stargazer mountain catfish, Amphilius uranoscopus (pfeffer); (Siluriformes: Amphiliidae) indigenous to Kenya streams

Some aspects of the biology of the stargazer mountain catfish, Amphilius uranoscopus (pfeffer); (Siluriformes: Amphiliidae) indigenous to Kenya streams

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri