21 research outputs found
Longitudinal river zonation in the tropics: examples of fish and caddisflies from endorheic Awash river, Ethiopia
Primary Research PaperSpecific concepts of fluvial ecology are
well studied in riverine ecosystems of the temperate
zone but poorly investigated in the Afrotropical
region. Hence, we examined the longitudinal zonation
of fish and adult caddisfly (Trichoptera) assemblages
in the endorheic Awash River (1,250 km in length),
Ethiopia. We expected that species assemblages are
structured along environmental gradients, reflecting
the pattern of large-scale freshwater ecoregions. We
applied multivariate statistical methods to test for differences in spatial species assemblage structure and
identified characteristic taxa of the observed biocoenoses
by indicator species analyses. Fish and
caddisfly assemblages were clustered into highland
and lowland communities, following the freshwater
ecoregions, but separated by an ecotone with highest
biodiversity. Moreover, the caddisfly results suggest
separating the heterogeneous highlands into a forested
and a deforested zone. Surprisingly, the Awash
drainage is rather species-poor: only 11 fish (1
endemic, 2 introduced) and 28 caddisfly species (8
new records for Ethiopia) were recorded from the
mainstem and its major tributaries. Nevertheless,
specialized species characterize the highland forests, whereas the lowlands primarily host geographically
widely distributed species. This study showed that a
combined approach of fish and caddisflies is a
suitable method for assessing regional characteristics
of fluvial ecosystems in the tropicsinfo:eu-repo/semantics/publishedVersio
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Fish Migration and Fish Passage Facilities in the Danube: Past and Present
Study of agricultural impacts through fish base variables in different rivers
Dominant agricultural society of Nepal demonstrates the sign of
compromises on its rural and virgin landscape. The current study
investigates the fish base indices on some of its watershed. It is a
proven fact that fish base variables such as species diversity and the
abundance indicate the extent of impact by various disturbances on the
ecological integrity of the river system. Three rivers, namely
Jhikhukhola, Rapti and Tinau were studied to see the agricultural
impact by taking fish species number and their abundance as the
indicators in this work. The study was done for an academic purpose
from 2003 to 2006 in which sampling was done using electro-fishing gear
by standard wading method. Four replicates of sample taken in four
major seasons were obtained in the field. Altogether, 10542 fishes of
24 genera and 34 species were captured during the entire sampling. The
comparison of their distribution and abundance showed a clear sign of
impact mainly on the downstream of the rivers indicating the rapid
increase in unaccounted and indiscriminate use of agricultural inputs
such as synthetic fertilizers and pesticides. This was further verified
by nonparametric Kruskal-Wallis test which showed the significant
variations in the impact on the downstream in major agricultural
season
Length-weight relationship of sucker head, Garra Gotyla Gotyla (Gray, 1830) in different rivers of Nepal and the influence of monsoon
Size structure data particularly that of length and weight is very
important fisheries management tool, which is also applied to assess
the health, habitat and integrity of the rivers. Nepal is tremendously
rich in both fisheries and water resource and thus, this analysis is
very important. However, this kind of analysis is not common in
fisheries studies and hence the size structure information of all the
fish in Nepal is wanting. This study simply tries to open the door for
such studies with the study of the sucker head Garra gotyla gotyla, a
very common fish in Nepal. The field observation was done in nine
rivers of the country in all the seasons of the 2003 by using
electrofishing gear. The length-weight relationship was found to vary
both spatially and temporally among rivers and seasons respectively
indicating different conditions in different rivers. The length weight
relationship also showed some interesting facts about the seasonal
cycle of the species indicating the period of growth and stress in
different rivers. The monsoon event was found to be highly influential
in this relationship
The course of fish colonisation in the Marchfeldkanal-System, a man-made canal — the first two years
\u201cIntegrating BOMOSA cage fish farming system in reservoirs, ponds and temporary water bodies in Eastern Africa\u201d
Project summary
Project full title: Integrating BOMOSA cage fish farming systems in reservoirs, ponds and temporary water bodies in Eastern Africa Project acronym: BOMOSA
Keywords: aquatic farming, participatory approach, socio-economic models
Project abstract: The BOMOSA Project will research the economic viability, social acceptance and necessary institutional environment of a relatively simple technology that has been proven technically feasible over the last two years. BOMOSA is pioneering small scale fish farming in Eastern Africa by establishing rural aquaculture networks (coordinated in a \u201chub and plot\u201d system) to economically integrate aquaculture with agriculture. The BOMOSA system will form the basis of a socio-economic model that will contribute to poverty alleviation in Eastern Africa by providing sources of supplementary high protein food and additional income to rural communities in Kenya, Ethiopia and Uganda.
The 36-month project involves four European partners: \u2022 two universities, a science academy and an NGO and \u2022 six African partners: two Kenyan universities and four government\u2013run fisheries research centers from Kenya (2) and one each from Ethiopia and Uganda.
The summarized scientific and technical objectives of the project are:
\u2022 Apply a participatory approach to define targets in terms of economic viability and social acceptability at community levels for the new BOMOSA plots.
\u2022 Develop and validate an evaluation method using remote sensing to assess and characterize water bodies for use as potential BOMOSA plots.
\u2022 Set up fourteen BOMOSA plots and optimize the technology in three types of small (less than 5 ha.) water bodies within four eco-zones across Kenya, Ethiopia and Uganda.
\u2022 Evaluate locally available, agricultural by-products and cost-effective processing technologies as a resource for sustainable production of low-protein fish feed.
\u2022 Determine requirements and make recommendations for a legal and regulatory framework based on potential veterinary, public health and environmental impacts of BOMOSA.
\u2022 Develop capacity building and dissemination material for the local community, relevant authorities and policy makers and the international scientific community.
\u2022 Develop a socio-economic model for sustainable introduction and widespread uptake of the BOMOSA scheme in Eastern Africa
\u201cIntegrating BOMOSA cage fish farming system in reservoirs, ponds and temporary water bodies in Eastern Africa\u201d
Project summary
Project full title: Integrating BOMOSA cage fish farming systems in reservoirs, ponds and temporary water bodies in Eastern Africa Project acronym: BOMOSA
Keywords: aquatic farming, participatory approach, socio-economic models
Project abstract: The BOMOSA Project will research the economic viability, social acceptance and necessary institutional environment of a relatively simple technology that has been proven technically feasible over the last two years. BOMOSA is pioneering small scale fish farming in Eastern Africa by establishing rural aquaculture networks (coordinated in a \u201chub and plot\u201d system) to economically integrate aquaculture with agriculture. The BOMOSA system will form the basis of a socio-economic model that will contribute to poverty alleviation in Eastern Africa by providing sources of supplementary high protein food and additional income to rural communities in Kenya, Ethiopia and Uganda.
The 36-month project (october 2006-september 2009) involves four European partners: \u2022 two universities, a science academy and an NGO and \u2022 six African partners: two Kenyan universities and four government\u2013run fisheries research centers from Kenya (2) and one each from Ethiopia and Uganda.
The summarized scientific and technical objectives of the project are:
\u2022 Apply a participatory approach to define targets in terms of economic viability and social acceptability at community levels for the new BOMOSA plots.
\u2022 Develop and validate an evaluation method using remote sensing to assess and characterize water bodies for use as potential BOMOSA plots.
\u2022 Set up fourteen BOMOSA plots and optimize the technology in three types of small (less than 5 ha.) water bodies within four eco-zones across Kenya, Ethiopia and Uganda.
\u2022 Evaluate locally available, agricultural by-products and cost-effective processing technologies as a resource for sustainable production of low-protein fish feed.
\u2022 Determine requirements and make recommendations for a legal and regulatory framework based on potential veterinary, public health and environmental impacts of BOMOSA.
\u2022 Develop capacity building and dissemination material for the local community, relevant authorities and policy makers and the international scientific community.
\u2022 Develop a socio-economic model for sustainable introduction and widespread uptake of the BOMOSA scheme in Eastern Africa