期刊
FISHERIES MANAGEMENT AND ECOLOGY
卷 10, 期 3, 页码 191-199出版社
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-2400.2003.00339.x
关键词
annual yields; Bangladesh; CPUE; fisheries; fishing effort; flood pulse; floodplain; GIS
类别
Floodplain fisheries were monitored from 1992 until 2000 in the Compartmentalization Pilot Project in Tangail, Bangladesh. In permanent floodplains about 165 +/- 28 kg ha(-1) of fish was caught annually. For seasonal floodplains, this figure was 83 +/- 23 kg ha(-1) yr(-1) . The fish catch exhibited a strong seasonal variation, with the highest catch in October, when the floodwater recedes towards the river, and the lowest catch during the dry season in April/May. The annual catch varied with the extent of flooding, with high catches in wet years and low catches in dry years. The extent of flooding was quantified through a Flood Index. Plotting the annual yields against this Flood Index provided a significant relation (P < 0.05), confirming the existence of a flood pulse. The fishing effort (f ) and the catch-per-unit-effort (CPUE) were significantly related (P < 0.05), whereby the fishing effort increased with increasing CPUE. The results are discussed within the frame of fisheries management in Bangladesh and highlight the need for long-term data for proper evaluation of fisheries projects and the development of management schemes, and the difficulty of applying standard surplus production models in floodplain fisheries.
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