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Related Experiment Video

Updated: Dec 10, 2025

Alternative Method of Removing Otoliths from Sturgeon
05:07

Alternative Method of Removing Otoliths from Sturgeon

Published on: June 27, 2016

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Quantifying an overlooked aspect of partial migration using otolith microchemistry.

Mehis Rohtla1, Lagle Matetski1, Imre Taal1

  • 1Estonian Marine Institute, University of Tartu, Tartu, Estonia.

Journal of Fish Biology
|September 4, 2020
PubMed
Summary

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Spatial and intra-host distribution of myxozoan parasite Tetracapsuloides bryosalmonae among Baltic sea trout (Salmo trutta).

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Biology letters·2022

Partial migration in brown trout (Salmo trutta) was quantified for the first time. Resident females significantly contribute to sea trout populations, highlighting their crucial role in migratory fish resilience.

Area of Science:

  • Ecology
  • Evolutionary Biology
  • Fisheries Science

Background:

  • Partial migration, where individuals within a population exhibit different migratory behaviors, is common in fish.
  • The contribution of different life-history strategies to population dynamics is often poorly understood.
  • Brown trout (Salmo trutta) exhibit complex migratory behaviors, including residency and anadromy.

Purpose of the Study:

  • To quantify the relative contributions of freshwater resident and anadromous female brown trout to sea trout populations.
  • To investigate the maternal origin of sea trout in the Baltic Sea.
  • To assess the ecological significance of resident fish in supporting migratory populations.

Main Methods:

  • Otolith microchemistry analysis to determine fish origin.
Keywords:
Baltic Seaanadromybrown troutotolith microchemistryresident

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  • Sampling of wild sea trout (Salmo trutta) along the Estonian coast of the Baltic Sea.
  • Estimation of maternal contributions from resident and anadromous life histories.

    • Main Results:

    • 88% of sampled sea trout were of anadromous maternal origin.
    • 12% of sampled sea trout were of resident maternal origin.
    • This indicates a substantial contribution from resident females to the sea trout population.

    Conclusions:

    • The resident contingent of brown trout plays a vital role in the persistence and resilience of the migratory contingent.
    • Understanding partial migration dynamics is crucial for effective fisheries management and conservation.
    • Otolith microchemistry is a powerful tool for tracing fish origins and understanding population connectivity.