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Konferensartikel2023Vetenskapligt granskad

Management of the Gulf of Riga herring (Baltic Sea): Lessons learned and challenges ahead

Raid, Tiit; Arula, Timo; Sepp, Elor; Hommik, Kristiina; Kaljuste, Olavi; Strods, Guntars; Putnis, Ivars; Plikshs, Maris

Sammanfattning

Maximum sustainable yields and maintaining the intraspecific biodiversity are the aim in fish stock management. Here populations-based management would be the preferred practice. Yet available stock discrimination methods result in establishing the conventional assessment/management units as a compromise. The Baltic herring (Clupea harengus membras L.) exhibits remarkable geographical variabil-ity, forming up to12 local populations. Due to reasons mentioned above, only two distinct local populations (Gulf of Riga, (GoR) herring and Gulf of Bothnia herring), are treated as separate assessment and manage¬ment units. The paper describes the annual workflow of the management process, collection of the biological information from commercial catches and from the research surveys. Management history of GoR herring has revealed a number of challenges. Acoustic estimates are the only fisheries-independent data applied in GoR herring stock assessment. The study highlights the need for methodological changes what are expected to allow enhancing the quality of stock estimates, serving as the basis for the management decisions. We show that while before climate-driven regime shift (prior-1990s) recruitment was determined by the winter tem¬perature, affecting survival of Young of the year, a new major productivity bottleneck is in increasing spring-summer water temperatures during hatching and larval first-feeding stage.

Nyckelord

Baltic herring; assessment; management; fishery; novel insights

Publicerad i

Proceedings in Marine Technology and Ocean Engineering
2023, volym: 9, sidor: 411-420
Titel: Sustainable Development and Innovations in Marine Technologies
Utgivare: CRC PRESS-TAYLOR & FRANCIS GROUP

Konferens

19th INTERNATIONAL CONGRESS OF THE INTERNATIONAL-MARITIME-ASSOCIATION-OF-THE-MEDITERRANEAN (IMAM), SEP 26-29, 2022, Istanbul, TURKEY

SLU författare

UKÄ forskningsämne

Vilt- och fiskeförvaltning

Publikationens identifierare

  • DOI: https://doi.org/10.1201/9781003358961-51
  • ISBN: 9781032416182
  • eISBN: 9781003358961

Permanent länk till denna sida (URI)

https://res.slu.se/id/publ/129591