Monday 10 June 1991
| 08.00 | Registration |
| 09.00 – 09.10 | Opening of the seminar |
| 09.10 – 09.20 | Welcoming address by Ilppo Kangas, the Deputy Director, Ministry of Agriculture and Forestry |
SESSION 1
Mass removal of fish in inland waters
Chair: T. Petr, FAO B. Steinmetz, The Netherlands | |
| 09.20 – 10.00 | Results of a questionnaire concerning mass removal of fish in EIFAC countries B. Steinmetz, The Netherlands |
| 10.00 – 10.20 | Mass-removal of fish from Lake Volderwijd (2 700 ha), The Netherlands: 1. Planning and strategy M.P. Grimm, The Netherlands J.J.G.M. Backx, The Netherlands |
| 10.20 – 10.40 | Mass-removal of fish from Lake Wolderwijd (2 700 ha), The Netherlands: 2. Results of the first campaign J.J.G.M. Backx, The Netherlands R.L.P. Lanters, The Netherlands M.P. Grimm, The Netherlands |
| 10.40 – 10.55 | Break |
| 10.55 – 11.35 | Development of electric fishing techniques for the mass removal of fish in large inland waters I.G. Cowx, United Kingdom |
| 11.35 – 11.50 | Trawling for cyprinids - fishing efficiency and catch processing S. Hamrin, Sweden |
| 11.50 – 12.10 | Tifa fish management technique for mass removal of undesirable fish from inland waters A.M. Livingston, USA G. Osman, USA |
| 12.10 – 12.20 | Discussion |
| 12.30 – 13.45 | Lunch |
SESSION 2
The effect of intensive fishing on fish populations
Chair: D. Barthelmes, Germany J. Sarvala, Finland | |
| 13.45 – 14.25 | Reaction of fish populations to extraordinary intensive fishing in lakes of Eastern Germany D. Barthelmes, Germany |
| 14.25 – 14.45 | Effects of intensive fishing on a population of arctic charr A. Klemetsen, Norway |
| 14.45 – 15.05 | Methods for assessing the efficiency of mass removal of fish H. Helminen, Finland A. Hirvonen, Finland J. Sarvala, Finland |
| 15.05 – 15.50 | POSTER SESSION PRESENTATIONS OF VIDEOS AND FILMS |
15.15 – 15.25 A. Hirvonen, H. Helminen, J. Sarvala, Finland The flourishing winter seining in Lake Pyhäjärvi (video) | |
15.30 – 15.40 P. Hyvärinen, Finland Some professional vendace catching methods at inland waters (video) | |
| 15.50 – 16.10 | Impacts of intensive fisheries on lacustrine fish populations: case studies from Finland J. Sarvala, Finland H. Helminen, Finland H. Hirvonen, Finland J.-P. Ripatti, Finland |
| 16.10 – 16.30 | Film on electrofishing for common carp on Lake Wellington, Australia T. Petr, FAO/Rome |
| 16.30 – 16.50 | The effects of mass removal on the roach stock of Lake Vesijärvi estimated with seasonal VPA J. Horppila, Finland H. Peltonen, Finland |
| 16.50 – 17.15 | Discussion |
EVENING SESSIONS
| 17.15 | Roundtable discussion on mass removal of fish in tropical and subtropical countries: a rationale |
Chair: M. Gophen, Israel T. Petr, FAO/Rome | |
| 17.15 | Asp as a promising predator in eutrophic waters (slide presentation) M. Kaukoranta, J. Pennanen, Finland |
| 19.30 – 20.30 | Reception at the City of Lahti, City Hall |
Tuesday 11 June 1991
SESSION 3
BIOLOGICAL CONTROL: The use of predatory fish
Chair: M.P. Grimm, The Netherlands J. Vostradovsky, Czechoslovakia | |
| 09.00 – 09.40 | The use of predatory fish in controlling fish populations in eutrophic waters W.L.T. van Densen, The Netherlands |
| 09.40 – 10.10 | Piscivory in European fresh waters T. Backiel, Poland |
| 10.10 – 10.30 | The role of predation and competition in determining the outcome of biomanipulation measures: two case studies comparing the stocking of 0+ pike |
P.A. Walker, The Netherlands A.J.P. Raat, The Netherlands | |
| 10.30 – 10.45 | Break |
| 10.45 – 11.05 | Removal of fish by predators - theoretical aspects L. Urho, Finland |
| 11.05 – 11.25 | Ecological modifications in Lake Victoria after the invasion of Nile Perch M. Gophen, Israel |
| 11.25 – 11.45 | Discussion |
| 12.00 – 13.30 | Lunch |
SESSION 4
The role of fish behaviour, habitat alteration and interspecific competition
Chair: L. Persson, Sweden T. Backiel, Poland | |
| 13.30 – 14.10 | Mechanistic bases for productivity related shifts in fish communities L. Persson, Sweden |
| 14.10 – 14.50 | An outline of vegetation types and surface area overgrown in relation to densities of northern pike M.P. Grimm, The Netherlands |
| 14.50 – 15.40 | POSTER SESSION PRESENTATION OF VIDEOS AND FILMS |
15.00 T. Petr, FAO/Rome Experimental trawling for haplochromine stock assessment in Lake Victoria, Uganda, in the early 1970s (film) | |
| 15.40 – 16.00 | Clear water in Lake Wolderwijd, The Netherlands, (2 700 ha) after mass removal of fish S.H. Hosper, The Netherlands |
| 16.00 – 16.20 | Modelling of the effect of intensive fishing and eutrophication on inland waters ecosystems A.B. Kazanskij, USSR |
| 16.20 – 17.15 | Closing discussion Summaries of the chairs |
EVENING SESSIONS
| 17.15 | Roundtable discussion on the phenomenon “Zandermüdigkeit” Chair: D. Barthelmes, Germany |
| 17.15 | Eutrophication biomanipulation in China (video) W. Li, China |
| 20.00 – 24.00 | Seminar dinner |
Wednesday 12 June 1991
| 9.00 | Excursion to Lake Vesijärvi Trawling of coarse fish Lunch on the boat |
| 12.30 – 13.30 13.0 – 14.00 | Visit to Rapala factory; old and modern lures Return to Lahti |
AALTONEN, R.
Fisheries District of Hame
Box 31
13101 Hämeenlinna
Finland
Tel: +358 17 532 983
Fax: +358 17 532 487
AHONEN, M.
Finnish Game and Fisheries Research Inst.
Inarin Kalanviljelylaitos
99870 Inari
Finland
Tel: +358 697 51007
Fax: +358 697 51359
ANNADOTTER, H.
Municipal Services Department
Hässleholms gatukontor
Stadshuset
281 31 Hassleholm
Sweden
Tel: +46 45188318
Fax: +46 45189760
AUVINEN, H.
Finnish Game and Fisheries Research Inst.
58175 Enonkoski
Finland
Tel: +358 57 381271
Fax: +57 381588
AUVINEN, S.
Finnish Game and Fisheries Research Inst.
58175 Enonkoski
Finland
Tel: +358 57 381271
Fax: +57 381588
BACKIEL, T.
Inland Fisheries Institute
Zabieniec
05-500 Piaseczno
Poland
Tel: Warsaw 562044, 562088
BACKX, J.J.G.M.
Witteveen + Bos Consulting Engineers
PB 233
7400 AE Deventer
The Netherlands
Tel: +31 5760 97453
Fax: +31 5760 97344
BANKS, J.W.
National Rivers Authority
Kings Meadow Road
Reading RG1 8DQ
UK
Tel: +44 734 535506
Fax: +44 734 500388
BARTHELMES, D.
Institut fur Binnenfischerei
Muggelseedamm 310
1162 Berlin
Germany
Tel: +37 2 6452803
BERG, S.
Inland Fisheries Laboratory
Lysbrogade 52
8600 Silkeborg
Denmark
Tel: +45 89201400
Fax: +45 86803553
COLBY, P.
Ministry of Natural Resources
435 S. James Street
PO Box 5000
Thunder Bay
Ontario
P7C 5G6 Canada
Tel: +1 807 475 16361670
Fax: +1 807 475 1200
COWX, I.G.
Humberside International Fisheries Inst.
Hull, HU6 7RX
UK
Tel: +44 482 466421
Fax: +44 482 466205
DENSEN VAN, W.L.T.
Agricultural University of Wageningen
P.O. Box 338
6700 AH Wageningen
The Netherlands
Tel: +31 83 7083307
Fax: +31 83 7083962
Telex: NL 45015
EKLUND, J.
Fisheries District of Vaasa
Wolffskavägen 36
65200 Vaasa
Finland
Tel: +358 61 123327
GOPHEN, M.
Kinneret Limnological Laboratory
P.O. Box 345
Tiberias
Israel
Tel: +972 6 721444
Fax: +972 6 752820, 4 511911
GRIMM, M.P.
Witteveen + Bos Consulting Engineers
PO Box 233
7400 AE Deventer
The Netherlands
Tel: +31 5700 97911
Fax: +31 5700 97344
Telex: 49441 n1
HAMRIN S.F.
University of Lund
Institute of Limnology
P.O. Box 65
S22100 Lund
Sweden
Tel: 46 46 108437
HARTIKAINEN, J.
The Water Protection Ass. of Savo-Karjal
Yrittäjäntie 24
70820 Kuopio
Finland
Tel: +358 71 233644
Fax: +71 233404
HEIKINHEIMO-SCHMID, O.
Finnish Game and Fisheries Research Inst.
P.O. Box 202
00151 Helsinki
Finland
Tel: +358 0 624 211
HELMINEN, H.
University of Turku
Dept. of Biology
Servin Maijan tie 10 E 63
02150 ESPOO
Finland
Tel: +358 0 468 3236
HIMBERG, M.
State Educational Inst. of Fisheries
and Aquaculture
21610 Kirjala
Finland
Tel: +358 21 888 833
Fax: +358 21 888 560
HIRVONEN, A.
Restoration Project of Lake Köyliönjärvi
Hongikkonummi
27710 Köyliö
Finland
Tel: +358 39 541 184
Fax: +358 39 541 370
HONKANEN, A.
Keski-Uudenmaan vesiensuojelun k1
Kultasepankatu 4
04250 Kerava
Finland
Tel: +358 0 2944455
Fax: +358 0 2944822
HORPPILA, J.
University of Helsinki
Department of Limnology, Viikki
00710 Helsinki
Finland
Tel: +358 0 7085473
Fax: +358 0 7085257
HOSPER, S.H.
Inst. of Inland Water Management
Postbus 17
8200 AA Lelystad
The Netherlands
Tel: +31 3200 70411
Fax: +31 3200 49218
Telex: 40772
HUOVILA, J.
Kuopion vesi- ja ymparistopiiri
Box 49
70101 Kuopio
Finland
Tel: 358 71 164 622
HUTTENEN, M.
City of Lahti
PB 126
15141 Lahti
Finland
Tel: +358 18 81411
HUUSKO O.
Länsi-Pohjan ammat. aikuiskoulutuskeskus
Keskikatu 69
95430 Tornio
Finland
Tel: +358 698 876682
Fax: +358 698 876570
HUUSKO, A.
Finnish Game and Fisheries Research Inst.
Kainuu Field Station
88300 Paltamo
Finland
Tel: +358 86 874472
Fax: +358 86 874410
HYVARINEN, P.
Finnish Game and Fisheries Research Inst.
Fisheries Research Station Kuusiranta
88270 Vuolijoki
Finland
Tel: +358 86 89751
Fax: +358 86 89760
HYYTINEN, L.
Fisheries District of Mikeli
Otavankatu 8 B 9
50100 Mikkeli
Finland
Tel: +358 55 362611
Fax: +358 55 362315
JELONEK, M.
Institute of Fresh Water Biology
Ul. Slawkowska 17
31-016 Krakow
Poland
Tel: +48 12 222115
JURVELIUS, J.
Finnish Game and Fisheries Research Inst.
58175 Enonkoski
Finland
Tel: +358 57 381271
Fax: +358 57 381588
KAATRA, K.
National Board of Waters and the
Environment,
Box 250
00101 Helsinki
Finland
Tel: +358 0 69511
Fax: +358 0 695 1326
KAARIA, J.
Environmental Protection Office
City of Turku
Linnakatu 61
20100 Turku
Finland
Tel: +358 21 623461
Fax: +358 21 303518
KAIJOMAA, V.-M.
Fisheries District of Pohjois-Karjala
Kauppakatu 40
80100 Joensuu
Finland
Tel: +358 73 141 2571
KATAJAMAKI, A.
Environment Protection Office
Linnankatu 61
20100 Turku
Finland
Tel: +358 21 623461
Fax: +358 21 303518
KAUKORANTA M.
Finnish Game and Fisheries Research Inst.
Box 202
00151 Helsinki
Finland
Tel: +358 0 624211
Fax: +358 0 631513
KAZANSKIJ, A.
Inst. of the North Industrial Ecology
14 Fersman Str.
Apatity
184200 Apatity
Murmansk Region
USSR
Telex: 126129 kolse-su
KILPINEN, K.
Kalatalouden keskusliitto
Koydenpunojankatu 7 B 23
00180 Helsinki
Finland
Tel: +358 0 640126
Fax: +358 0 608309
KINNUNEN, K.
State Educational Inst. of Fisheries
and Aquaculture
21600 Kirjala
Finland
Tel: +358 21 888833
Fax: +358 21 88560
KLEMETSEN, A.
University of Trömsa
Breivika
N9000 Trömsa
Norway
Tel: +47 83 44517
Fax: +47 83 71832
KOLARI, I.
Finnish Game and Fisheries Research Inst.
Box 202
00151 Helsinki
Finland
Tel: +358 0 624211
Fax: +358 0 631513
KORHONEN, P.
Yliopistonkatu 38 as. 206
90570 Oulu
Finland
KORPINEN, J.
Finnish Game and Fisheries Research Inst.
Ohtaoja
93400 Taivalkoski
Finland
Tel: +358 88 51811
Fax: +358 88 51157
KOVANEN, J.
Fisheries District of Central Finland
Box 170
40101 Jyväskylä
Finland
Tel: +358 41 652362
Fax: +358 41 652380
LALUMIERE, R.
Groupe Environnement Shooner
40 Racine Street
Loretteville
Quebec G2B 1C6
Canada
Tel: +1 448 8432769
Fax: +1 418 8436337
LAPERLE, M.
Groupe Environnement Shooner
40 Racine Street
Loretteville
Quebec G2B 1C6
Canada
Tel: +1 514 9857268
Fax: +1 514 9857203
LAPPALAINEN, M.
Vesi-Eko Ky
Kotkankallionkatu 11
70600 Kuopio
Finland
Tel: +358 71 223400
Fax: +358 71 226760
LEHTINEN, E.
University of Kuopio
80400 Ylämylly
Finland
Tel: +358 73 851619
LEHTONEN, H.
Finnish Game and Fisheries Research Inst.
Box 202
00151 Helsinki
Finland
Tel: +358 0 624211
Fax: +358 0 631513
LI WENZHAO
Nanjing Inst. of Geography & Limnology
73 East Beijing Road
Nanjing 210008
China
Tel: +86 25 631510, 302936
Fax: +86 25 714759
LIVINGSTON, A.M.
TIFA Ltd
TIFA Square
Millington
New Jersey 07946
USA
Tel: +1 980 6474570
Fax: +1 908 6472517
Telex: 178098/178484
LUNDSTEDT, B.
Municipal Services Department
Hässleholms gatukontor
281 31 Hässleholm
Sweden
Tel: +46 45188101
Fax: +46 45189760
MAKELA, M.
University of Helsinki
Vapaudenkatu 6 A
15110 Lahti
Finland
Tel: +358 18 892300
Fax: +358 18 892331
MAGNAN, P.
University of Quebec at Trois-Rivières
Departement de Chimie-Biologie
CP 500
Trois-Rivières
Canada G9A 5H7
Tel: +1 819 3765053
Fax: +1 819 3765012
MIKSCHI, E.
Biologische Station Neusiedlersee
Goethegasse 4
A 2380 Perchtoldsdorf
Austria
Tel: 432 175 2328
MUHONEN, J.
Fisheries District of Hame
PB 31
13101 Hämeenlinna
Finland
Tel: +358 17 532983
Fax: +358 17 532487
MULLER, J.
Laboratory of Fish Ecology
Blegdamsvej 28 C
2200 KBH.N
Denmark
Tel: +45 31356510
NIEMI, A.
Fisheries District of Kymi
Paimenpolku 16
45100 Kouvola
Finland
Tel: +358 51 19511
Fax: +358 51 17659
OLKIO, K.
Agricultural Centre of Central Finland
Box 112
40101 Jyväskylä
Finland
Tel: +358 41 695107
Fax: +358 41 695106
OSMAN, G.
TIFA Ltd
TIFA Square
Millington
New Jersey 07946
USA
Tel: +1 980 6474570
Fax: +1 908 6472517
Telex: 178098/178484
PAASIVIRTA, L.
State Educational Inst. of Fisheries
and Aquaculture
21610 Kirjala
Finland
Tel: +358 21 888833
PEKKARINEN, M.
Keski-Uudenmaan vesiensuojelun kl.
Kultasepankatu 4
04250 Kerava
Finland
Tel: +358 0 294455
Fax: +358 0 2944822
PELTONEN, H.
University of Helsinki
Dept. of Limnology
Viikki
00710 Helsinki
Finland
Tel: +358 0 7085470
Fax: +358 0 7085257
PENN, A.
Cree Regional Authority
Suite 3438
1 Place Ville-Marie
Montreal
Quebec H3B 3N6
Canada
Tel: +1 514 8615837
Fax: +1 514 8615837
PENNANEN, J.
Finnish Game and Fisheries Research Inst.
Box 202
00151 Helsinki
Finland
Tel: +358 0 624211
PENTTINEN, K.
State Educational Inst. of Fisheries and
Aquaculture
21610 Kirjala
Finland
Tel: +358 21 888833
Fax: +358 21 888560
PERSSON, L.
University of Umeå
Department of Animal Ecology
S90187 Umeå
Sweden
Tel: +46 90 166316
Fax: +46 90 167665
PETR, T.
FAO
Fisheries Department (FIRI)
00100 Rome
Italy
Tel: +06 57976637
Fax: +06 3-96 512 0330
PORRA, K.
City of Lahti
Vesijarvenkatu 11A
15140 Lahti
Finland
Tel: +358 18 81411
PRUUKI, V.
Finnish Game and Fisheries Research Inst.
Box 202
00151 Helsinki
Finland
Tel: +358 0 624211
Fax: +358 0 631513
RAITANIEMI, J.
Finnish Game and Fisheries Research Inst.
Box 202
00151 Helsinki
Finland
Tel: +358 0 624211
Fax: +358 0 631513
RANTA, E.
Lansi-Uudenmaan vesi ja ymparisto ry
PL 51
08101 Lohja
Finland
Tel: 358 12 23623
Fax: +358 12 25697
RANTA-AHO, K.
Fisheries District of Turku
Hameenkatu 28
20700 Turku
Finland
Tel: +358 21 330963
Fax: +358 21 321314
RASK, M.
Finnish Game and Fisheries Research Inst.
16970 Evo
Finland
Tel: +358 17 135251
Fax: +358 17 135250
RUUHIJARVI, J.
Finnish Game and Fisheries Research Inst.
16960 Evo
Finland
Tel: +358 17 135251
Fax: +358 17 135250
SAIRANEN, M.
Environmental Protectional Office
Linnankatu 61
20100 Turku
Finland
Tel: +358 21 303518
SALMINEN, M.
Finnish Game and Fisheries Research Inst.
PB 202
000151 Helsinki
Finland
Tel: +358 0 624211
Fax: +358 0 631513
SALOJARVI, K.
Finnish Game and Fisheries Research Inst.
PB 202
00151 Helsinki
Finland
Tel: +358 0 624211
Fax: +358 0 631513
SAMMALKORPI, I.
University of Helsinki
Lahti Research and Training Centre
Teollisuuskatu 23
00510 Helsinki
Finland
Tel: +358 0 7084433
Fax: +358 0 7084439
SARVALA, J.
University of Turku
20500 Turku
Finland
Tel: +358 21 63351
Fax: +358 21 6336550
SAURA, A.
Finnish Game and Fisheries Research Inst.
Box 202
00151 Helsinki
Finland
Tel: +358 0 624211
Fax: +358 0 631513
SHOONER, G.
Groupe Environnement Shooner
40 Racine Street
Loretteville
Quebec
Canada
Tel: + 1 418 8432769
Fax: + 1 418 8436337
SIPPONEN, M.
Fisheries District of Central Finland
Box 170
40101 Jyvåskylå
Finland
Tel: +358 41 652360
Fax: +358 41 652380
STARMACH, J.
Institute of Fresh Water Biology
Ul. Slawkowska 17
31-016 Krakow
Poland
Tel: +48 12 222115
STEINMETZ, B.
Ministerie van Landbouw, Natuurbeheer en
Visserij
Postbus 20401
2500 EK Gravenhage
The Netherlands
Tel: +31 70 3793911
Fax: +31 70 3815153
Telex: 32040 Lavinl
SUNDELL, P.
University of Jyvåskylå
Box 35
40351 Jyvåskylå
Finland
Tel: +358 41 603832
Fax: +31 41 603831
SUTELA, T.
Taskilantie 34 as. 3
90580 Oulu
Finland
SVENSSON, S.I.
Office of Public Health
Håssleholms miljo-o hålsoskyddskontor
281 31 Håssleholm
Sweden
Tel: +46 45188328
Fax: +46 45111763
TAPIATIC, S.
Canada
TENGELIN, B.
Hushållningssällskapet
Box 275
S-581 02 Linköping
Sweden
Tel: +46 13129520
Fax: +46 13102794
TIITINEN, J.
Fisheries District of Mikkeli
Otavankatu 8 B9
50100 Mikkeli
Finland
Tel: +358 55 362263
Fax: +358 55 362315
TIMMERMANN, M.
Storstroms Council
Environmental Dept.
Storstoms amt
Parkvej 38
4800 Nykobing Falster
Denmark
Tel: +45 54823232
Fax: +45 54822370
TOPP, F.
Laboratory of Fish Ecology
Blegdamsvej 28C
2200 KBH N
Denmark
Tel: +45 31356510
TORPSTROM, H.
Vesi-Eko Ky
Kotkankallionkatu 11
70600 Kuopio
Finland
Tel: +358 71 223400
Fax: +358 71 226760
TURUNEN, T.
University of Joensuu
Karelian Inst.
Box 111
80101 Joensuu
Finland
Tel: 358 73 1513501
Fax: 358 73 1513590
URHO, L.
Finnish Game and Fisheries Research Inst.
Box 202
00151 Helsinki
Finland
Tel: +358 0 624211
Fax: +358 0 631513
VALKEAJARVI, P.
Finnish Game and Fisheries Research Inst.
Box 170
40101 Jyväskylä
Finland
Tel: +358 41 652370
VOSTRADOVSKY, J.
VURH
Research Station in Dol
252 66 Libcice nad Vltavou
Czechoslovakia
Tel: +42 2 6858200
WALKER, P.
Improvement of Inland Fisheries
Postbox 433
3430 AK Nievwegein
The Netherlands
Tel: +31 3402 58442
Fax: +31 3402 39874
VALTONEN, T.
University of Jyväskylä
Yliopistonkatu 9
40100 Jyväskylä
Finland
SESSION 1
MASS REMOVAL OF FISH IN INLAND WATERS
(Chair: T. Petr; B. Steinmetz)
Steinmetz, B. Results of a questionnaire concerning mass removal of fish in EIFAC countries.
Grimm, M.P., and J.J.G.M. Backx. Mass-removal of fish from Lake Wolderwijd (2 700 ha), The Netherlands: 1. Planning and Strategy.
Backx, J.J.G.M., R.L.P. Lanters and M.P. Grimm. Mass-removal of fish from Lake Wolderwijd (2 700 ha), The Netherlands: 2. Results of the first campaign
Cowx, I.G. Development of electric fishing techniques for the mass removal of fish in large inland waters.
Hamrin, S. Trawling for cyprinids - fishing efficiency and catch processing.
Livingston, A.M., and G. Osman. Tifa fish management technique for mass removal of undesirable fish from inland waters.
SESSION 2
THE EFFECT OF INTENSIVE FISHING ON FISH POPULATIONS
(Chair: D. Barthelmes; J. Sarvala)
Barthelmes, D. Reaction of fish populations to extraordinary intensive fishing in lakes of Eastern Germany.
Klemetsen, A. Effects of intensive fishing on a population of Arctic charr.
Helminen, H. Hirvonen and J. Sarvala. Methods for assessing the efficiency of mass removal of fish.
POSTER SESSION
PRESENTATIONS OF VIDEOS AND FILMS
Hirvonen, A., H. Helminen and J. Sarvala. The flourishing winter seining in Lake Pyhäjärvi (video)
Hyvarinen, P. Some professional vendace catching methods at inland waters (video)
Petr, T. Electrofishing for common carp, Lake Wellington, Australia (film).
PAPERS
J. Sarvala, H. Helminen, H. Hirvonen and J.P. Ripatti. Impacts of intensive fisheries on lacustrine fish populations: case studies from Finland.
Horppila, J. and H. Peltonen. The effects of mass removal on the roach stock of Lake Vesijärvi estimated with seasonal VPA.
EVENING SESSIONS
Gophen, M. and T. Petr. Round-table discussion on mass removal of fish in tropical and subtropical countries: a rationale.
Kaukoranta, M. and J. Pennanen. Asp as a promising predator in eutrophic waters (slide presentation).
SESSION 3
BIOLOGICAL CONTROL: THE USE OF PREDATORY FISH
(Chair: M.P. Grimm; J. Vostradovsky)
PAPERS
van Densen, W.L.T. The use of predatory fish in controlling fish populations in eutrophic waters.
Backiel, T. Piscivory in European fresh waters.
Walker, P.A., and A.J.P. Raat. The role of predation and competition in determining the outcome of biomanipulation measures: two case studies comparing the stocking of 0+ pike.
Urho, L. Removal of fish by predators - theoretical aspects.
Gophen, M. Ecological modifications in Lake Victoria after the invasion of Nile Perch.
SESSION 4
THE ROLE OF FISH BEHAVIOUR, HABITAT ALTERATION
AND INTERSPECIFIC COMPETITION
(Chair: L. Persson; T. Backiel)
PAPERS
Persson, K. Mechanistic bases for productivity related shifts in fish communities.
Grimm, M.P. An outline of vegetation types and surface area overgrown in relation to densities of northern pike.
POSTER SESSION
PRESENTATION OF VIDEOS AND FILMS
Petr, T. Experimental trawling for haplochromine stock assessment in Lake Victoria, Uganda, in early 1970s (film).
PAPERS
Hosper, S.H. Clear water in Lake Wolderwijd (2 700 ha) The Netherlands, after mass removal of fish.
Kazanskij, A.B. Modelling of the effect of intensive fishing and eutrophication on inland waters ecosystems.
EVENING SESSIONS
Barthelmes, D. Round-table discussion on the phenomenon “Zandermüdigkeit”
Li, W. Eutrophication biomanipulation in China (video)
Ahonen, M.
Mass removal of stunted whitefish (Coregonus pidschian (gmelin), in Inari area, northern
Finland.
Auvinen, H.
Effects of fishing on density and size-structure of fish populations in Lake Pyhäjärvi, a border
lake.
Jurvelius, J., I. Sammalkorpi
The effects of trawling on the density and distribution of pelagic fish in Lake Vesijärvi
Kinnunen, K. M. Himberg, and K. Penttinen
Shoal development and mass removal of unwanted fish in Lake Alimmainen, Posionlampi,
Finland
Kääriä, J., L. Rannikko and V. Tschernij
Ecological management of Lake Kakskerranjärvi
Li, W.
Aquatic macrophytes and pond fish farming system in the eastern part of Taihu Lake
Meijer, M.L. and S.H. Hosper
Lake Wolderwijd - effects of drastic fish stock reduction on water quality
Ruuhijärvi, J. and M. Salminen
Pikeperch stocking in Lake Vesijärvi - biomanipulation and improvement of fishery value
Popova, O.A., and O.P Sterligova
The importance of predatory fish in Lake Syamozero
Sammalkorpi, I. and J. Keto
Aims and problems in the biomanipulation of Lake Vesijärvi, a large eutrophicated multi-basin
lake in southern Finland
Turunen, T.
The structure of smelt (Osmerus eperlanus L.) population in a large, heavily eutrophicated lake
(Lake Vesijärvi)
Vostradovsky, J.
Some aspects of the use of different methods to control unwanted fish in reservoirs.
