Related items
Showing items related by metadata.
-
Book (series)A review of major river basins and large lakes relevant to inland fisheries 2021
Also available in:
No results found.This review presents summary information on 45 river and great lake basins of the world, which support inland fisheries. The information presented is drawn from published information in peer-reviewed journals as well as grey literature. Each basin summary is presented in a common format, covering the description of the fishery, estimates of catch and numbers of people engaged in the fishery, important biodiversity features and threats to the fishery. An analysis of the replacement costs of inland fish of the basin is also presented. This is expressed in terms of the water, land and greenhouse gas footprint that would arise if the inland fish that are currently produced had to be replaced with other forms of food (such as aquaculture fish, livestock or field crops). -
No Thumbnail AvailableBook (series)Predicting ecology and fish yields in African reservoirs from preimpoundment physico-chemical data / Ecologie des réservoirs africains et leur rendement en poisson à partir de données psycho-chimiches réunies avant endiguement 1984
Also available in:
No results found.This paper attempts to improve the predictive capabilities of preimpoundment studies, with special emphasis on fish yields. It relies heavily on empirical models based on a relatively limited data base. It is hoped that the results will show that meaningful predictions can be made from simple, easily obtained data, a consideration especially important in an era of limited manpower and financial resources. The models described in this paper have not always been based on African data. Those that have been will be affected by the general inaccuracy of the original information, especially that regarding fish yields from African reservoirs. Nevertheless, if these limitations are borne in mind, the models may still be valuable and will have served their purpose if they stimulate others to use and improve them. An appendix has been included to illustrate the use of the models described in the text in an actual preimpoundment situation. -
No Thumbnail AvailableBook (series)River Fisheries 1985
Also available in:
Rivers drain all but the most arid areas of the earth through channels that are regu- lated by physical laws that impose on them certain forms. The ideal form is rarely encountered in practice and represents an end point to which geographic process tend. In general a river may be divided into two principal zones, the steep and fast flowing rhithron upstream and the sluggish and flat potamon downstream. While conditions in an individual system are highly variable along its length, similar reaches of different rivers differ much less even between continents and at different latitudes. All continents have a series of major river systems which consist not only of the river channels but also the swamps, lakes and seasonally flooded lands associated with them. Most rivers are highly conditioned by the patterns of precipitation in their basins. Differences in rainfall intensity throughout the year generate a flood wave that progresses downstream in the majority of rivers (flood rivers), al though singular geographic circumstances may distribute discharge more evenly throughout the year in some systems (reservoir rivers). The number of reservoir rivers is increasing through flow regulation and dam building. Although the basic nature of the river is determined by the rocks over which it flows, the flood regime seasonally modifies the physical and chemical conditions within the river particularly in the tropics. In higher latitudes other features of climate, such as insolation or air temperature exert an increasing influence.
Users also downloaded
Showing related downloaded files
No results found.