The Experts below are selected from a list of 114 Experts worldwide ranked by ideXlab platform
Kim Geheb - One of the best experts on this subject based on the ideXlab platform.
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nile perch and the hungry of lake victoria gender status and food in an east african Fishery
Food Policy, 2008Co-Authors: Kim Geheb, Sarah Kalloch, Modesta Medard, Annetherese Nyapendi, C Lwenya, M KyangwaAbstract:Abstract Lake Victoria supports Africa’s largest Inland Fishery, and its most valuable product is the Nile perch, much of which is exported. This has given rise to arguments claiming a direct linear relationship between perch exports and disturbingly high rates of malnutrition along the lake’s shores. In this paper, we argue that this argument is seriously flawed for it is unable to explain how it is that the income from the Nile perch Fishery fails to translate into a well-fed riparian population. We draw on field work carried out in 2001 that (a) set out to establish exactly how much malnutrition there was on the lake’s shores; and (b) sought to identify what happened to the income the Fishery generates. We argue that because men control much of the Fishery, and women are held responsible for the upkeep of their families, little of this income makes its way back into the households of the region, giving rise to the levels of malnutrition we observed.
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biodiversity and Fishery sustainability in the lake victoria basin an unexpected marriage
BioScience, 2003Co-Authors: J S Balirwa, Colin A Chapman, Lauren J Chapman, I G Cowx, Kim Geheb, Les Kaufman, Rosemary H Lowemcconnell, Ole Seehausen, Jan H Wanink, Robin L WelcommeAbstract:Abstract Lake Victoria is Africa's single most important source of Inland Fishery production. After it was initially fished down in the first half of the 20th century, Lake Victoria became home to a series of introduced food fishes, culminating in the eventual demographic dominance of the Nile perch, Lates niloticus. Simultaneously with the changes in fish stocks, Lake Victoria experienced dramatic changes in its ecology. The lake Fishery during most of the 20th century was a multispecies Fishery resting on a diverse lake ecosystem, in which native food fishes were targeted. The lake ended the century with a much more productive Fishery, but one in which three species—two of them introduced—made up the majority of the catch. Although many fish stocks in Lake Victoria had declined before the expansion of the Nile perch population, a dramatic increase in the population size of Nile perch in the 1980s roughly coincided with the drastic decline or disappearance of many indigenous species. Now, two decades aft...
Robin L Welcomme - One of the best experts on this subject based on the ideXlab platform.
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biodiversity and Fishery sustainability in the lake victoria basin an unexpected marriage
BioScience, 2003Co-Authors: J S Balirwa, Colin A Chapman, Lauren J Chapman, I G Cowx, Kim Geheb, Les Kaufman, Rosemary H Lowemcconnell, Ole Seehausen, Jan H Wanink, Robin L WelcommeAbstract:Abstract Lake Victoria is Africa's single most important source of Inland Fishery production. After it was initially fished down in the first half of the 20th century, Lake Victoria became home to a series of introduced food fishes, culminating in the eventual demographic dominance of the Nile perch, Lates niloticus. Simultaneously with the changes in fish stocks, Lake Victoria experienced dramatic changes in its ecology. The lake Fishery during most of the 20th century was a multispecies Fishery resting on a diverse lake ecosystem, in which native food fishes were targeted. The lake ended the century with a much more productive Fishery, but one in which three species—two of them introduced—made up the majority of the catch. Although many fish stocks in Lake Victoria had declined before the expansion of the Nile perch population, a dramatic increase in the population size of Nile perch in the 1980s roughly coincided with the drastic decline or disappearance of many indigenous species. Now, two decades aft...
J S Balirwa - One of the best experts on this subject based on the ideXlab platform.
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biodiversity and Fishery sustainability in the lake victoria basin an unexpected marriage
BioScience, 2003Co-Authors: J S Balirwa, Colin A Chapman, Lauren J Chapman, I G Cowx, Kim Geheb, Les Kaufman, Rosemary H Lowemcconnell, Ole Seehausen, Jan H Wanink, Robin L WelcommeAbstract:Abstract Lake Victoria is Africa's single most important source of Inland Fishery production. After it was initially fished down in the first half of the 20th century, Lake Victoria became home to a series of introduced food fishes, culminating in the eventual demographic dominance of the Nile perch, Lates niloticus. Simultaneously with the changes in fish stocks, Lake Victoria experienced dramatic changes in its ecology. The lake Fishery during most of the 20th century was a multispecies Fishery resting on a diverse lake ecosystem, in which native food fishes were targeted. The lake ended the century with a much more productive Fishery, but one in which three species—two of them introduced—made up the majority of the catch. Although many fish stocks in Lake Victoria had declined before the expansion of the Nile perch population, a dramatic increase in the population size of Nile perch in the 1980s roughly coincided with the drastic decline or disappearance of many indigenous species. Now, two decades aft...
M Kyangwa - One of the best experts on this subject based on the ideXlab platform.
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nile perch and the hungry of lake victoria gender status and food in an east african Fishery
Food Policy, 2008Co-Authors: Kim Geheb, Sarah Kalloch, Modesta Medard, Annetherese Nyapendi, C Lwenya, M KyangwaAbstract:Abstract Lake Victoria supports Africa’s largest Inland Fishery, and its most valuable product is the Nile perch, much of which is exported. This has given rise to arguments claiming a direct linear relationship between perch exports and disturbingly high rates of malnutrition along the lake’s shores. In this paper, we argue that this argument is seriously flawed for it is unable to explain how it is that the income from the Nile perch Fishery fails to translate into a well-fed riparian population. We draw on field work carried out in 2001 that (a) set out to establish exactly how much malnutrition there was on the lake’s shores; and (b) sought to identify what happened to the income the Fishery generates. We argue that because men control much of the Fishery, and women are held responsible for the upkeep of their families, little of this income makes its way back into the households of the region, giving rise to the levels of malnutrition we observed.
Taku Kadoya - One of the best experts on this subject based on the ideXlab platform.
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trends and stability of Inland Fishery resources in japanese lakes introduction of exotic piscivores as a driver
Ecological Applications, 2015Co-Authors: Shinichiro S Matsuzaki, Taku KadoyaAbstract:Although many studies have focused on marine resources, few studies have considered the resources of Inland fisheries. Inland Fishery resources are typically either monitored on the basis of catch data alone or are not assessed quantitatively at all, despite their social, economic, and ecological importance. Because freshwater ecosystems have been severely degraded by human activities, evaluating the trends and current status of Fishery resources and assessing their drivers are urgent tasks. We compiled long-term data on the annual catch, fishing effort, and fishing power of 23 Japanese lakes, using two sets of government statistics that date back to the 1950s, which were previously neglected because of the large number of missing values. Using Bayesian state-space models, we examined the trajectories of the catch per unit effort (CPUE) of entire communities, considering changes in fishing effort and fishing power, and quantified both changes in the CPUE over the 10-, 20-, and 30-year periods preceding 2008 and the temporal detrended stability of the CPUE over the three periods. We also investigated the relationships among the CPUE changes and stability, anthropogenic drivers, and lake morphometric characteristics. The CPUE declined in 17, 19, and 15 of the 23 lakes over the past 10-, 20-, and 30-year periods, respectively. Our macroecological analyses demonstrate that the functional group richness of exotic piscivores was the most important predictor of changes in the CPUE among the drivers we considered. The stability of the CPUE was positively related to lake area; larger lakes have more stable CPUE. The functional group richness of exotic piscivores also negatively affected the stability of the CPUE. The effect of overfishing was considered to be small because both fishing effort and power declined in almost all of the lakes. Thus, our findings suggest that increasing exotic piscivore species may diminish the resources and their stability, particularly in Japanese lakes where native piscivores are rare. This might lead to a substantial decline in ecosystem services. Our study highlights the importance of assessing Inland Fishery resources in a comprehensive manner and the need for restoration strategies to mitigate the effects of exotic piscivores.