Pikeperch HELCOM Pan Baltic Scope EFH WS 2018 Proposed map: - - PowerPoint PPT Presentation

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Pikeperch HELCOM Pan Baltic Scope EFH WS 2018 Proposed map: - - PowerPoint PPT Presentation

Aug 29, 2023 702 likes •775 views

Baltic Marine Environment Protection Commission Regional expert workshop on essential fish habitats, H organized by Pan Baltic Scope project and HELCOM E Riga, Latvia, 12-13 December 2018 Pikeperch HELCOM Pan Baltic Scope EFH WS 2018

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SLIDE 1

Pikeperch

Baltic Marine Environment Protection Commission

Regional expert workshop on essential fish habitats,

  • rganized by Pan Baltic Scope project and HELCOM

Riga, Latvia, 12-13 December 2018 H E

HELCOM Pan Baltic Scope EFH WS 2018

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SLIDE 2

www.panbalticscope.eu

Proposed map: Recruitment areas of pikeperch

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Similar as in HOLAS II: Environmental window, But:

  • national approach

for Finnish waters

  • manual

corrections to Swedish waters

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SLIDE 3

www.panbalticscope.eu

Variables and data used

Depth < 5 m and Distance to deep (10 m waters) <4 km

Baltic Sea Bathymetry database (http://data.bshc.pro/#2/51.8/20.1), complemented in some coastal areas with IOW bathymetry data (Seifert et al. 2001).

Wave exposure (logged value <5)

Wave Impact Index calculated for the whole Baltic Sea (Isæus 2004).

Salinity (<7)

Monthly means of May for years 2011-2014 downloaded from Copernicus Marine Environment Monitoring Service (http://marine.copernicus.eu). Reanalysis products of SMHI for years 1989-2004, 5.5km grid cells. A May mean for 2011-2014 was calculated. Extrapolation to some coastal areas (that were outside the original data due to low resolution

  • f the grid) was carried out.

Secchi depth < 2 m

Satellite based (MERIS) composite layer of May 2011, kindly provided by Krista Alikas at Tartu Observatory, Estonia (Alikas and Kratzer, submitted).

Exceptions

EFH in Finnish waters is based on national approach (Kallasvuo et al. 2017) Corrections to Swedish waters added

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SLIDE 4

www.panbalticscope.eu

Initial feedback from experts

Estonian waters: there are pikeperch spawning areas only in Pärnu bay and probably some spawning takes plave in Väinameri area mostly in Matsalu bay. Lithuanian waters: We hardly now any pikeperch spawning site within the Curonian Lagoon. Usually they migrate for spawning at least a little bit upstream from the Curonian Lagoon to the Nemunas river. Small pikeperch, are caught in all Curonian lagoon, so all lagoon is important as recruitment (but not spawning) area.

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SLIDE 5

www.panbalticscope.eu

Proposed way forward

Use the map as presented in document 2, after considering the following:

  • For Estonia to consider if detailed corrections are

needed

  • Offer Lithuania to propose detailed corrections on

correspondence if needed

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