Sea trout in Electrofishing and habitat mapping

Klaipeda 2018

Martin Kesler 14 20 16 15 12 19 17 13 9 22 21 1110 8 1 18 6 25 23 7 5 4 3 2 24 26 2827 31 3029 32

33 1 R. Tõrvajõgi 21 Br. 42 Br. Kiruma 34 (trb. of R. Narva) 35 22 Br. 43 R. Tirtsi 2 Br. Udria 23 R. Pirita 44 Br. Ligeoja 3 Br. Künnapõhja 36 24 R. 45 R. Pidula 37 4 R. Pühajõgi 25 R. Keila 46 Br. Oju 5 R Purtse 26 Br. Treppoja 47 Br. Vesiku 6 Br. Sõreda 48. Br. Jämaja 39 38 27 R. 42 41 40 7 Br. Meriküla 28 R. Kloostri 49 Br Ristioja 45 43 8 R. Pada 44 29 R. 50 Br. Soonda 9 R. Kunda 50 51 30 Br. Keibu 51 R. Paadrema 46 10 R. Toolse 31 R. Veskijõgi 52 Br. 11 R. Selja 47 55 32 R. Nõva 53 R. Tõstamaa 56 12 R. 33 R. Riguldi 54. Br. Männiku 52 53 49 13 R. 34 R. Nuutri 55. Br. Tuuraste 54 14 Br. 35 Br. Poama 56 R Reiu (trb.of R. Pärnu) 57 15 R. Võsu 58 36 Br.Õngu 57 R. Rannametsa 59 16 R. Loobu 48 60 37 R. Vanajõgi 58 R Häädemeeste 61 17 R. Valgejõgi 38 Br. Taaliku 59 Br Kadaka 62 18 R. 39 R. Võlupe 60 Br. Priivitsa 19 R. Loo 40 R. 61 Br Lemme 20 Br. 41 R. Punapea 62 Br Loode Monitoring I

Electrofishing to estimate parr density (about 50 rivers and 70-100 sites annually). Since 1974

Recently supplemented with parr otolith studies to check resident/anadromous ratio among parr.

Over 95% of parr in accessible sites have anadromous maternal parent

Rohtla et al. 2017 Monitoring II

Partial smolt trapping (mark-recapture estimate) in one river (r. Pirita)

Since 2008 Monitoring III

Spawner count since 2014 (a fence guiding fish through vaki counter, r. Pirita) Releases

No releases in 2018 Reported catches on the coast

By commercial gear 30 Main Basin 25 Size limit 50 cm Gulf of Finland

20

15 Catch(t) No information 10 about angling at 5 Sea !!! 0 THS Difference ca 15 %

Average 0+ trout parr density 2008-2017 60 Zippin 50 fishing efficiency not estimated

2 40

30

ind./100m 20

10

0 4 5 6 7 8 9 10 11 12 Total THS Difference ca 9 %

Aver. 1+ and older trout parr density 2008-2017

14 Zippin 12 fishing efficiency not estimated

10 2 8

6 ind./100m 4

2

0 4 5 6 7 8 9 10 11 12 Total THS

Habitat evaluation during inventory (mapping)

• AA quality – expected 0+ parr density 80 ind./100 m2 (20 smolts per 100 m2) • A quality – expected 0+ parr density 40 ind./100 m2 (10 smolts per 100 m2) • B quality – expected 0+ parr density 20 ind./100 m2 (5 smolts per 100 m2) • C quality – expected 0+ parr density 8 ind./100 m2 (2 smolts per 100 m2) New knowledge

• Size and location of spawning areas • Potential smolt production • Overview of migration obstacles and potential restoration/improvement sites (if necessary)

• Step II – Fish passes, new spawning sites, habitat improvement etc. THS 7 or more THS 7 THS 12 ! Local context Thank you