1. Polish-Norwegian Research Fund Assessment of the ecological state of lakes based on ichthyofauna data. First attempt Witold Białokoz and Łucjan Chybowski Department of Lake Fisheries Inland Fisheries Institute Giżycko

2. Polish-Norwegian Research Fund 1.Collecting and analyzing archive data relating to lake ichthyofauna 2.Analyzing the ichthyofauna of catchment area lakes 3.Validating metric indices developed in Poland based on the species composition and the structure of ichthyofauna 4.Integrating the results of lake analyses based on ichthyofauna metrics 5.Evaluating the ecological state of the studied lakes based on ichthyofauna data Tasks of the Inland Fisheries Institute

3. Polish-Norwegian Research Fund Species/Lake Dąbr. W.Dąbr. M.RumianZarybinek Tarczyń- skieGrądy Lidzbar- skie Kielpiń- skie Harto- wieckieZwiniarz Karp - Carp0,0 0,10,0 Karaś - Crucian carp0,0 0,10,20,0 Karaś srebrz. - Prussian carp 0,0 0,10,0 Kiełb - Gudgeon0,0 0,10,00,80,0 Lin - Tench0,10,0 0,20,0 Różanka - Bitterling0,0 0,20,70,00,10,0 0,30,0 Leszcz - Bream0,70,54,133,419,75,17,18,313,80,5 Krąp - White bream 3,29,35,72,211,717,13,312,212,80,3 Płoć - Roach25,222,130,349,617,024,221,923,542,231,3 Wzdręga - Rudd1,20,90,30,80,0 2,20,10,0 Boleń - Asp0,0 0,1 0,0 0,20,0 Jaź - Ide0,0 0,20,0 Kleń - Chub0,0 0,10,0 Ukleja - Bleak0,79,736,86,02,931,734,018,314,356,5 Koza - Spined loach0,0 0,20,0 0,20,0 Sum - Wels0,0 0,10,0 Szczupak - Pike0,20,00,10,90,00,1 0,0 Sielawa - Vendace1,60,0 Pstrąg potok - Brown trout 0,0 Okoń - Perch50,648,515,12,59,712,920,531,54,35,3 Jazgarz - Ruffe16,48,97,53,034,07,612,13,410,43,7 Sandacz - Pike-perch0,0 0,20,74,61,10,70,00,72,4 Total100,0 Number of specimens1012131110 11 128 Udział liczbowy ryb (%) złowionych zestawem nordyckim

4. Polish-Norwegian Research Fund Species/Lake Dąbr. W.Dąbr. M.RumianZarybinek Tarczyń- skieGrądy Lidzbar- skie Kielpiń- skie Harto- wieckieZwiniarz Karp - Carp 0,0 3,60,0 Karaś - Crucian carp 0,0 1,30,0 Karaś srebrz. - Prussian carp 0,0 1,80,0 Kiełb - Gudgeon 0,0 0,10,00,30,0 Lin - Tench 0,10,00,30,0 0,30,0 Różanka - Bitterling0,0 0,10,0 Leszcz - Bream 2,34,56,728,932,913,816,513,125,85,5 Krąp - White bream 1,99,66,51,08,118,03,07,49,81,4 Płoć - Roach 56,917,740,627,615,127,836,127,037,744,3 Wzdręga - Rudd 1,11,20,20,90,0 2,80,10,0 Boleń - Asp 0,0 2,56,10,0 1,10,0 Jaź - Ide 0,0 3,00,0 Kleń - Chub 0,0 0,40,0 Ukleja - Bleak0,211,019,41,30,917,812,18,29,920,4 Koza - Spined loach 0,0 Sum - Wels 0,0 3,70,0 Szczupak - Pike 3,09,54,729,70,01,41,90,0 Sielawa - Vendace 1,90,50,0 Pstrąg potok - Brown trout 0,01,10,0 Okoń - Perch 28,642,716,06,74,07,912,338,87,17,7 Jazgarz - Ruffe 3,92,35,31,54,43,04,21,25,82,3 Sandacz - Pike-perch 0,0 0,22,325,34,29,60,00,418,4 Total100,0 Number of specimens1012131110 11 128 Udział wagowy ryb (%) złowionych zestawem nordyckim

5. Polish-Norwegian Research Fund Species/Lake Dąbr. W.Dąbr. M.RumianZarybinek Tarczyń- skieGrądy Lidzbar- skie Kielpiń- skie Harto- wieckieZwiniarz Karp - Carp0,0 Karaś - Crucian carp0,0 0,10,20,0 Karaś srebrz. - Prussian carp0,0 0,10,0 Kiełb - Gudgeon0,0 0,10,00,70,0 Lin - Tench0,10,0 0,20,0 Różanka - Bitterling0,0 0,40,30,00,10,0 0,30,0 Leszcz - Bream0,80,710,912,59,63,33,48,311,10,4 Krąp - White bream3,713,315,20,85,711,31,612,310,30,3 Płoć - Roach29,131,780,918,58,316,010,623,633,828,0 Wzdręga - Rudd1,41,30,70,30,0 2,20,10,0 Boleń - Asp0,0 0,1 0,0 0,20,0 Jaź - Ide0,0 0,10,0 Kleń - Chub0,0 0,10,0 Ukleja - Bleak0,813,998,32,31,421,016,518,411,450,6 Koza - Spined loach0,0 0,10,0 0,20,0 Sum - Wels0,0 0,10,0 Szczupak - Pike0,30,10,20,30,00,10,0 Sielawa - Vendace1,80,0 Pstrąg potok - Brown trout0,0 Okoń - Perch58,569,540,31,04,78,510,031,63,44,8 Jazgarz - Ruffe18,912,819,91,116,55,05,93,58,33,3 Sandacz - Pike-perch0,0 0,40,32,30,70,30,00,52,2 NPUE100115,5143,3267,337,448,666,048,6100,580,289,6 Efektywność połowów zestawem nordyckim (NPUE ind/100 m2)

6. Species/Lake Dąbr. W.Dąbr. M.RumianZarybinek Tarczyń- skieGrądy Lidzbar- skie Kielpiń- skie Harto- wieckieZwiniarz Karp - Carp0,0 256,90,0 Karaś - Crucian carp0,0 1,40,0 0,171,40,0 Karaś srebrz. - Prussian carp0,0 85,00,0 Kiełb - Gudgeon0,0 0,70,0 1,80,014,70,8 Lin - Tench2,31,115,20,0 15,30,0 Różanka - Bitterling0,0 1,12,10,00,60,0 2,00,0 Leszcz - Bream86,6121,3352,4808,82339,0533,0332,2743,61226,1396,5 Krąp - White bream72,2260,4344,527,4576,2694,660,6420,5466,3104,0 Płoć - Roach2129,7483,02151,5773,81074,31074,6725,51531,31789,83193,6 Wzdręga - Rudd40,631,910,625,10,0 156,83,20,0 Boleń - Asp0,0 176,5235,80,0 54,10,0 Jaź - Ide0,0 216,50,0 Kleń - Chub0,0 7,60,0 Ukleja - Bleak9,3299,01030,335,262,0688,0244,1466,5468,41469,7 Koza - Spined loach0,0 1,10,0 1,80,0 Sum - Wels0,0 75,40,0 Szczupak - Pike112,7259,2248,9831,40,054,438,70,40,0 Sielawa - Vendace71,713,00,0 Pstrąg potok - Brown trout0,030,60,0 Okoń - Perch1071,01159,8845,8188,1286,8303,5247,72199,3337,6556,1 Jazgarz - Ruffe145,662,0282,643,2315,6115,084,467,3276,9162,9 Sandacz - Pike-perch0,0 12,365,61795,9164,2192,50,019,61325,6 WPUE100 W [g]3741,72721,25297,42801,77099,83863,72010,55674,34743,77209,2 Polish-Norwegian Research Fund Efektywność połowów zestawem nordyckim (WPUE g/100 m2)

7. Polish-Norwegian Research Fund A total of 22 fish species were caught in the lakes in the catchment area of the Wel River. The greatest species abundance was observed in Lakes Rumian (13) and Dąbrowa Mała (12), and the lowest – in Lake Zwiniarz (8). In the majority of the studied lakes, the most abundant species were the perch, roach, bleak, ruffe, white bream and bream.

8. Polish-Norwegian Research Fund The resulting catch was weakly represented by the pike and the tench, even in lakes where the above species are normally abundant. The numbers of older bream and roach individuals were also relatively low. Their numbers are much higher in the catch from commercial fishery. In stratified lakes, fish were rarely encountered at greater depths in oxygen-deficient water layers.

9. Polish-Norwegian Research Fund  Data available from Nordic gillnet sampling campaign: species occurrence; fish distribution across the studied lakes (in area and depth); CPUE (number and biomass); fish size distribution.  Metric indices available for the deWELopment Project: obligatory species occurrence; presence of indicators and sensitive species (perch, vendace, pike-perch in vendace lakes); share of species and species groups; reproductive continuity – for common species; zone accessibility for fish (littoral, pelagic, profundal); other... ?

10. Polish-Norwegian Research Fund German proposal for central baltic GIG (CEN nordic nets) Deep lakesMediumShallow WPUE- Bream - Ruffe - White Bream - benthic net species - Ruffe - benthivorous species - Pikeperch - Perch + benthic net species - benthivorous species - Polish LFI (comercial catches) Deep lakesMediumShallow Pikeperch -Big bream + Perch +Big roach + Big bream +Predators +Litoral fishes + Big roach +Small cyprinids -

11. Polish-Norwegian Research Fund Comparison of perch and cyprinids share in catches with nordic nets

12. Polish-Norwegian Research Fund Comparison of perch and roach share in catches with nordic nets

13. Polish-Norwegian Research Fund Comparison of perch and bream share in catches with nordic nets

14. Polish-Norwegian Research Fund Comparison of perch and rudd share in catches with nordic nets

15. Polish-Norwegian Research Fund Comparison of perch and ruffe share in catches with nordic nets

16. Polish-Norwegian Research Fund Comparison of perch and pike-perch share in catches with nordic nets

17. Polish-Norwegian Research Fund Comparison the assessments of ecological status of lakes Lake name Abiotic typeFish type Histo ricalLFI N of spec.TSI SOJJ scoreLHMS Macr MNtotPtotSD Chlor a Dąbrowa Wielka2avendace0,860,811053,61,871441,030,0482,813 Dąbrowa Mała3avendace0,750,681257,52,251431,010,0541,819 Rumian3apike-perch/bream0,560,411360,62,621431,090,081,726 Zarybinek3btench/pike 1163,42,251431,070,0761,136 Tarczyńskie3bpike-perch/bream 1066,92,371241,280,0840,856 Grądy3apike-perch/bream 1067,22,751241,280,0880,855 Lidzbarskie3avendace 1161,631631,470,0731,428 Kiełpińskie3apike-perch/bream 1152,71,871230,880,0663,48 Hartowieckie3btench/pike 1261,82,121631,140,0681,227 Zwiniarz3btench/pike 869,22,371441,40,1170,869

18. Polish-Norwegian Research Fund German proposal for central baltic GIG (CEN nordic nets) Deep lakesMediumShallow WPUE- Bream - Ruffe - White Bream - benthic net species - Ruffe - benthivorous species - Pikeperch - Perch + benthic net species - benthivorous species - Polish LFI (comercial catches) Deep lakesMediumShallow Pikeperch -Big bream + Perch +Big roach + Big bream +Predators +Litoral fishes + Big roach +Small cyprinids -

19. Polish-Norwegian Research Fund Thank you for your attention. Feel free to share your questions and comments. Lake Dąbrowa Wielka