Effects of seasonal spawning closures on pike (Esox lucius L.) and perch (Perca fluviatilis L.) catches and coastal food webs in the western Baltic Sea

Eklöf, Johan; Hansen, Joakim P.; Eriksson, Britas Klemens; Östman, Örjan; Austin, Åsa N.; Yanos, Casey; Fredriksson, Ronny; Bergström, Ulf; Andersson, Henrik C.

doi:10.1016/j.fishres.2023.106674

Cited by 6 publications

(6 citation statements)

References 54 publications

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“…Unfortunately, there is no information of the levels of fishing pressure in the studied sites, which are mainly subject to recreational fishing. Recent studies in the same coastal region have demonstrated no responses of perch nor roach (the most abundant cyprinid) to seasonal spawning closures (Eklöf et al 2023 ), as well as wetlands (Hansen et al 2020 ). These measures could, however, have benefited pike (Nilsson et al 2014 ; Hansen et al 2020 ), potentially leading to cascading effects on cyprinids.…”

Section: Discussionmentioning

confidence: 99%

Fish community responses to restoration of a eutrophic coastal bay

Bergström,

Fredriksson,

Bergström

et al. 2023

Ambio

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Interest in coastal restoration measures is increasing, but information about subsequent ecosystem recovery processes is limited. In Björnöfjärden on the Baltic Sea coast, Stockholm archipelago, a pioneering case study to reduce coastal eutrophication led to improvements and initially halved phosphorus levels. Here, we evaluate the effects of the restoration on the local fish assemblage over one decade after the measures. The study gives a unique possibility to evaluate responses of coastal fish to nutrient variables and abatement in a controlled natural setting. Cyprinid abundance decreased and perch partially increased with decreasing turbidity levels, while mean trophic level increased over time in the restored area. Responses were overall weak, likely attributed to an attenuation of the eutrophication abatement effect over time. The results suggest that nutrient reduction gives slow responses in fish compared to alternative measures such as fishing closures.

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Section: Discussionmentioning

confidence: 99%

Fish community responses to restoration of a eutrophic coastal bay

Bergström,

Fredriksson,

Bergström

et al. 2023

Ambio

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“…För att undersökningens resultat ska kunna fungera som referensmaterial för motsvarande typer av provfisken i olika delar av Sverige användes en liknande metodik som tidigare projekt, se t.ex. Eklöf et al (2023). Undersökningen hade som ytterligare målsättning att försöka estimera hur upprepat fiske påverkar fångstbarheten hos gädda eftersom det kan påverka spöprovfiskemetodens användbarhet (Kuparinen et al 2010).…”

Section: Design Och Metod 21 Designunclassified

“…Osäkerheter till trots har metoden med spöprovfiske efter gädda fungerat väl för att beskriva skillnader mellan områden och vikar, både vad gäller tätheter och storleksstruktur (Eklöf et al 2023). Därtill kan extra information samlas in, exempelvis fångst-återfångst för beräkningar av totala populationsstorlekar, samt genetisk provtagning.…”

Section: Slutordunclassified

“…Metoden går ut på att man med en standardiserad ansträngning sportfiskar efter gädda på förutbestämda platser. Metoden har fått god spridning och har använts från Blekinge till Gävle samt på Åland (se till exempel Eklöf et al 2023).…”

Section: Introduktionunclassified

“…Det är ett relativt lågt värde jämfört med 0.75 gäddor per spöfisketimme som erhölls i Stockholms skärgård år 2020, där 752 spötimmar i 22 vikar resulterade i 553 gäddor(Ogonowski et al 2023). I en tidigare undersökning, år 2017, i delvis samma vikar (22 stycken), fångades 425 gäddor på 692 timmar, vilket motsvarar 0.61 gäddor per spöfisketimme(Eklöf et al 2023). Fångst-per-ansträngning (NPUE) per område, vik och provtagningstillfälle uppvisade trots problem med mer komplexa modeller en del mönster av intresse (Figur 2).…”

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Spöprovfiske efter gädda i Vänern

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Guidance on assessing the potential impacts of selenium in freshwater ecosystems

Palace,

Graves,

Brandt

2024

Integr Envir Assess & Manag

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Despite decades of fate and effects studies, environmental selenium (Se) contamination and management remain an issue for many freshwater systems in North America. Several regulatory bodies have promulgated updated targets or management levels for Se; however, additional guidance on best practices for monitoring Se to protect freshwater aquatic life is warranted. In this article, we describe current approaches to assessing the ecological risks of Se in impaired freshwater systems and outline recommended methods for collecting and analyzing biological and abiotic samples and interpreting data. Because reproductive impairment of fish populations is most commonly used to determine the potential impacts of Se, several biological factors that could affect Se toxicity are explored, including diet, trophic positions, reproductive biology, body size and maturity, migratory movements, and use of seasonal habitats. Measuring Se concentrations in mature eggs is the most reliable metric for estimating potential reproductive impairment in fish populations because the range of toxicity thresholds is relatively narrow for all but a few tolerant fish species. In situations where collecting mature eggs is not feasible, we review the use of alternative fish tissue for estimating potential effects. Factors affecting Se uptake from freshwater are also considered with guidance on collecting abiotic (e.g., water and sediment) and biotic components of aquatic food webs (e.g., macroinvertebrates, biofilm). Integr Environ Assess Manag 2024;00:1–16. © 2024 SETAC

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Effects of seasonal spawning closures on pike (Esox lucius L.) and perch (Perca fluviatilis L.) catches and coastal food webs in the western Baltic Sea

Cited by 6 publications

References 54 publications

Fish community responses to restoration of a eutrophic coastal bay

Fish community responses to restoration of a eutrophic coastal bay

Spöprovfiske efter gädda i Vänern

Guidance on assessing the potential impacts of selenium in freshwater ecosystems

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