<abstract xmlns="http://www.w3.org/1999/xhtml"><p>The age structure and length distribution of sea trout spawners caught in the Vistula River mouth in the 1984–1986 period were analyzed in reference to previous Vistula stocks of summer spawning and winter spawning runs, and also to silvering sea trout. The comparison took into consideration two variants: the period when the sea trout summer spawning and winter spawning runs ascended the Vistula and when they gathered at spawning grounds. Statistically significant differences were confirmed in the age structure and length distribution of sea tout spawners caught in the Vistula River mouth in the 1980s and the previous Vistula stocks. The reason for these difference must be sought in management interventions and especially in the permanent cycle of smolt production, sea trout spawner selection when they ascended the Vistula, catches made for artificial spawning, and the periodic stocking of sea trout with material originating from Pomeranian rivers.</p></abstract>

The age structure and length distribution of sea trout spawners caught in the Vistula River mouth in the 1984–1986 period were analyzed in reference to previous Vistula stocks of summer spawning and winter spawning runs, and also to silvering sea trout. The comparison took into consideration two variants: the period when the sea trout summer spawning and winter spawning runs ascended the Vistula and when they gathered at spawning grounds. Statistically significant differences were confirmed in the age structure and length distribution of sea tout spawners caught in the Vistula River mouth in the 1980s and the previous Vistula stocks. The reason for these difference must be sought in management interventions and especially in the permanent cycle of smolt production, sea trout spawner selection when they ascended the Vistula, catches made for artificial spawning, and the periodic stocking of sea trout with material originating from Pomeranian rivers.

Characteristics of sea trout spawners (<italic>Salmo trutta</italic>) in the Vistula River mouth in reference to the previous Vistula River stocks

Fisheries & Aquatic Life

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Characteristics of sea trout spawners () in the Vistula River mouth in reference to the previous Vistula River stocks

The age structure and length distribution of sea trout spawners caught in the Vistula River mouth in the 1984–1986 period were analyzed in reference to...

Characteristics of sea trout spawners (Salmo trutta) in the Vistula River mouth in reference to the previous Vistula River stocks

Article Category: Research Article

Online veröffentlicht: 18. Nov. 2020

Seitenbereich: 166 - 174

Eingereicht: 08. Apr. 2020

Akzeptiert: 10. Sept. 2020

DOI: https://doi.org/10.2478/aopf-2020-0020

Schlüsselwörter
sea trout, summer and winter spawning runs, scales, river age, sea age, body length

© 2020 Paweł Buras, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Characteristics of sea trout spawners (Salmo trutta) in the Vistula River mouth in reference to the previous Vistula River stocks

Article Category: Research Article

Online veröffentlicht: 18. Nov. 2020

Seitenbereich: 166 - 174

Eingereicht: 08. Apr. 2020

Akzeptiert: 10. Sept. 2020

DOI: https://doi.org/10.2478/aopf-2020-0020

Schlüsselwörtersea trout, summer and winter spawning runs, scales, river age, sea age, body length

© 2020 Paweł Buras, published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Schlüsselwörter
sea trout, summer and winter spawning runs, scales, river age, sea age, body length