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Growing conflicts between fish-eating birds
and the fisheries managers trying to prevent them from depleting their
stocks compelled the International Fisheries Institute at the University
of Hull in the United Kingdom to sponsor as special symposium and workshop
in 2001 titled "Interactions Between Fish and Birds: Implications for Management."
The papers selected for the symposium, and collected in this volume, analyze
the impact that the birds are having on fish populations and seek to understand
the role of habitat and mitigation efforts on that impact.
The editor of this collection, Ian G. Cowx,
contributed to five of the 28 research papers and authored the concluding
piece, "Interactions Between Fisheries and Fish-eating Birds: Optimizing
the Use of Shared Resources" in which he calls for further research and
greater cooperation.
"How can we minimise the potential conflicts
between fishermen and bird conservationists?" he asks.
"The solution probably lies in the optimization
of resource allocation of the fish stocks to satisfy both groups. Essentially,
sufficient fish must be available to satisfy the demands of the anglers/fishermen
in terms of catching success while allowing the birds to co-exist. The
principal mechanism adopted by fisheries managers to enhance fish stocks
is stocking."
The research and case studies presented in
this book are primarly European, ranging from problems with water birds
in Estonia and colonial wading birds in Austria to mergansers in Wales
and cormorants in Germany. They illustrate how ecological, environmental
and conservation issues combine with commercial pressures to make
the management of exploited fish populations a complex and difficult task.
Also by Ian
G. Cowx
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Contents
Preface
I. Impact of birds on
fisheries
1 Bird-fisheries-interactions:
the complexity of managing a system of predators and preys
2 Key factor analysis to
assess cormorant depredation on inland fisheries in the UK.
3 The relationship between
cormorant and fish populations at a fishery system in England: an overview
4 A theoretical assessment
of cormorant impact on the fish stocks in Great Britain
5 Fish stocks, commercial
fishing and cormorant predation in the Vistula Lagoon, Poland
6 The impact of black cormorant
on the eel fishery in the River Havel catchment area, Germany
7 Do cormorants and fishermen
compete for fish resources in the Väinameri (eastern Baltic) area?
8 Interactions in the utilisation
of small fish by piscivorous fish and birds, and by the fishery in IJsselmeer
9 A quantitative assessment
of the impact of goosander, Mergus merganser,on salmonid populations in
two upland river systems in England and Wales
II. Bird, fish, habitat
interactions
10 Interaction between fish
and colonial wading birds within reed beds of Lake Neusiedl, Austria
11 Management of cyprinid
fish populations as an important prey group for the endangered piscivorous
bird, bittern, Botaurus stellaris
12 On the feeding ecology
of the pied kingfisher, Ceryle rudis at Lake Nokoué, Benin. Is there
competition with fishermen?
13 Seasonal and spatial
variation in cormorant predation in a lowland floodplain river
14 Assessing the interaction
between cormorants and fisheries: the importance of fish community change
15 Fish predation by great
cormorants, Phalacrocorax carbo carboides, in the Gippsland Lakes, south-eastern
Australia
16 Changes in the piscivorous
bird community at a Polish submontane reservoir between 1990 and 2000 in
relation to water level
17 The role of parasites
in fish-bird interactions: a behavioural ecological perspective
18 Will the explosion of
Ligula intestinalis in Rastrineobola argentea lead to another shift in
the fisheries of Lake Victoria?
III. Mitigation measures
19 The potential use of
fish refuges to reduce damage to inland fisheries by cormorants, Phalacrocorax
carbo
20 Pilot trials to assess
the efficacy of fish refuges in reducing the impact of cormorants on inland
fisheries
21 Impact of cormorants
on the Loch Leven trout fishery and the effectiveness of shooting as mitigation
22 Enhancing stocks of European
eels, Anguilla anguilla, to benefit bittern, Botaurus stellaris
23 Experimental manipulation
of great blue heron and belted kingfisher predation rates on stream fishes
IV. Management
24 Managing a balance between
double-crested cormorant numbers and warmwater fish abundance in the eastern
basin of Lake Ontario, New York; preliminary insights from a management
programme
25 Management of the cormorant,
Phalacrocorax carbo, and endangered whitefish, Coregonus lavaretus, populations
of Haweswater, UK
26 Turnover in a wintering
cormorant population: implications for management
27 The impact of fisheries
on water birds in Estonia: nature protection and socio-economic perspectives
28 Interactions between
fisheries and fish-eating birds: optimizing the use of shared resources |
