FISH PASSES |
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The designations employed and the presentation of material in this publication do not imply the expression of any opinion whatsoever on the part of the Food and Agriculture Organization of the United Nations concerning the legal status of any country, territory, city or area or of its authorities, or concerning the delimitation of its frontiers or boundaries. |
DVWK ISBN 3-89554-027-7
FAO ISBN 92-5-104894-0
DVWK ISSN 0722-7167
All rights reserved. Reproduction and dissemination of material in this information product for educational or other non-commercial purposes are authorized without any prior written permission from the copyright holders provided the source is fully acknowledged. Reproduction of material in this information product for resale or other commercial purposes is prohibited without written permission of the copyright holders. Applications for such permission should be addressed to the Chief, Electronic Publishing Policy and Support Branch, Communication Division, FAO, Viale delle Terme di Caracalla, 00153 Rome, Italy or by e-mail to [email protected]
FAO/DVWK ABSTRACT Key words: fish pass; fishway; fish ladder; technical fish passes; close-to-nature types; hydraulic calculation; upstream migration; free passage; river rehabilitation; restoration; longitudinal connectivity; monitoring |
Part I (713 Kb)
1 Introduction
2 Ecological principles
2.1 Running water ecosystems3 General requirements for fish passes
2.2 River continuum
2.3 Biological zoning of running waters
2.4 Potentially natural species composition
2.5 Migration behaviour of aquatic organisms
2.6 Hazards to aquatic fauna caused by dams and weirs
3.1 Optimal position for a fish pass
3.2 Fish pass entrance and attraction flow
3.3 Fish pass exit and exit conditions
3.4 Discharge and current conditions in fish pass
3.5 Lengths, slopes, resting pools
3.6 Design of the bottom
3.7 Operating times
3.8 Maintenance
3.9 Measures to avoid disturbances and to protect the fish pass
3.10 Integration into the landscape
Part II (616 Kb)
4 Close-to-nature types of fish passes
4.1 Bottom ramps and slopes
4.2 Bypass channels
4.3 Fish ramps
4.4 Hydraulic design
Part III (842 Kb)
5 Technical fish passes
5.1 Pool pass6 Monitoring of fish passes
5.2 Slot passes
5.3 Denil pass
5.4 Eel ladders
5.5 Fish lock
6.1 Objective of monitoring7 Legal requirements
6.2 Methods
6.3 Assessment of results
7.1 New installations
7.2 Existing installations
Part IV (181 Kb)
8 References
9 Table of symbols and signs
10 Glossary
Photo credit
Appendix:
Overview of the most frequently used
construction types of fish passes