The fish fauna of three North African lagoons: specific inventories, ecological status and production

被引:0
|
作者
M. M. Kraïem
L. Chouba
M. Ramdani
M. H. Ahmed
J. R. Thompson
R. J. Flower
机构
[1] INSTM – 28,Laboratory of Aquaculture
[2] University Mohamed V Charia Ibn Batota,Department of Zoology and Animal Ecology, Institute Scientifique
[3] National Authority for Remote Sensing and Space Sciences,Department of Marine Resources
[4] University College London,Wetland Research Unit/Environmental Change Research Centre, UCL Department of Geography
来源
Hydrobiologia | 2009年 / 622卷
关键词
North Africa; Lagoons; Fisheries; Specific inventory; Production; Biology;
D O I
暂无
中图分类号
学科分类号
摘要
This paper examines the ecological and biological status of fisheries in three coastal lagoons in the southern Mediterranean region: Merja Zerga in Morocco, Ghar El Melh in Tunisia and Lake Manzala in Egypt. Despite similarities in some ecological characteristics, the three lagoons’ respective fisheries show differences in specific composition, in population structure and in their production both in qualitative and quantitative aspects. Thus, in Merja Zerga and Ghar El Melh the fish fauna shows a marine affinity where grey mullet and eels dominate the fish production. In Lake Manzala the ichthyofauna displays a more freshwater affinity with tilapia the dominant group of species. Otherwise, overall fish production at the three sites is regulated by variations in fishing activities, local environments and seasonal conditions. A decrease in fish production was noted over recent years and this is attributed to deteriorating ecological conditions. A variety of factors are implicated including sea communication problems, reduction of the continental (fresh) water supply and increase of pollution causing eutrophication. In addition, over fishing with a continuing increase of fishing effort units, contributes to fisheries decline.
引用
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页码:133 / 146
页数:13
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