Perch (Perca fluviatilis) and pikeperch (Sander lucioperca) in the diet of the great cormorant (Phalacrocorax carbo) and effects on catches in the Archipelago Sea, Southwest coast of Finland

Salmi, Juhani; Auvinen, Heikki; Raitaniemi, Jari; Kurkilahti, Mika; Lilja, Juha; Maikola, Riikka

doi:10.1016/j.fishres.2014.10.011

Cited by 29 publications

(58 citation statements)

References 29 publications

(45 reference statements)

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“…These results agree with data in other publications that report pikeperch as being susceptible to cormorant predation (Engström 2001, Mustamäki et al 2014, Salmi et al 2015. In many areas where these two species occur together, it has been confirmed that the share of pikeperch in the cormorant diet fluctuates significantly (Emmrich and Düttmann 2011).…”

Section: Discussionsupporting

confidence: 91%

“…In addition to common species, the cormorant diet also included those that are endangered and protected Traczuk 2010b, Delmastro et al 2015), as well as economically valuable (Wzi¹tek et al 2010, Troynikov et al 2013, Salmi et al 2015. Pikeperch, because of the highly prized of its meat, is in great consumer demand and is fished eagerly by 126 Piotr Traczuk, Andrzej Kapusta commercial fishers in Poland.…”

Section: Discussionmentioning

confidence: 99%

“…In many areas where these two species occur together, it has been confirmed that the share of pikeperch in the cormorant diet fluctuates significantly (Emmrich and Düttmann 2011). In the waters of southwest Finland, pikeperch comprises from 0.04 to 10% of the biomass of the fish consumed (Salmi et al 2015). In Bavaria, outside of the post-spawning season, it did not exceed 1% (Keller 1995) or in Holland -10% (Dirksen et al 1995).…”

Section: Discussionmentioning

confidence: 99%

“…Differences in assessments of the impact of cormorants on fish and the fisheries are explained by varied cormorant predation pressure on particular species, fisheries pressure, fish assemblage structure, and even differences in research methods (Salmi et al 2015). However, the dynamic increase in cormorant abundance is controversial especially among fishers who exploit waters located within the vicinities of breeding colonies or night roosts.…”

Section: Introductionmentioning

confidence: 99%

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Great cormorant (Phalacrocorax carbo) predation on pikeperch (Sander lucioperca L.) in shallow eutrophic lakes in Poland

Traczuk

Kapusta

2017

Archives of Polish Fisheries

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Abstract. Increases in the population abundance of the piscivorous great cormorant (Phalacrocorax carbo) has led to conflicts with fisheries. Cormorants are blamed for decreased fish catches in many lakes in Poland. The aim of this paper is to describe to role of pikeperch (Sander lucioperca) in the diet of cormorants nesting in a colony on the island in Lake Warno³ty. Since the breeding colony is located in the vicinity of Lake OEniardwy, the largest lake in Poland, the cormorants use the resources in this lake. In 2009-2016, 18,432 regurgitated fish were collected, of which 593 were pikeperch. The share of pikeperch among fish collected in 2009-2012 did not exceed 2%, but from 2013 this increased substantially to maximum of 38.2% in 2015. The smallest pikeperch had a standard length of 8.4 cm, and the largest 42.5 cm. Pikeperch mean length differed by year, and the length distribution was close to normal. The sizes of the regurgitated pikeperch indicate that cormorants prey almost exclusively on juvenile specimens. The results of the present study indicate that cormorant predation has a significant impact on pikeperch populations in lakes in the vicinity of the colony, and the great cormorants are possibly a significant factor in the effectiveness of pikeperch management. When planning for the management of fish populations in lakes subjected to cormorant predation pressure, it should be borne in mind that predation by this piscivorous bird species impacts the abundance and size-age structure of fish populations.

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Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Great cormorant (Phalacrocorax carbo) predation on pikeperch (Sander lucioperca L.) in shallow eutrophic lakes in Poland

Traczuk

Kapusta

2017

Archives of Polish Fisheries

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“…Pikeperch are mainly captured using gillnets, which are highly size-selective. During the recent years, natural predation by the great cormorant (Phalacrocorax carbo sinensis) on small pikeperch may have increased (Salmi et al, 2015). Natural predation on small individuals typically favours late maturation and fast growth (Abrams and Rowe, 1996;Vainikka and Hyvärinen, 2012).…”

Section: Is Fishing Driving the Changes In Lp 50 Values?mentioning

confidence: 99%

Probabilistic maturation reaction norm trends reveal decreased size and age at maturation in an intensively harvested stock of pikeperch Sander lucioperca

Kokkonen¹,

Vainikka

Heikinheimo³

2015

Fisheries Research

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Effects of water temperature and pikeperch (Sander lucioperca) abundance on the stock–recruitment relationship of Eurasian perch (Perca fluviatilis) in the northern Baltic Sea

et al. 2019

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How spawning stock size, environmental conditions and recruitment relate to each other is an essential question in understanding population dynamics of exploited fish stocks. We estimated the recruitment of Eurasian perch (Perca fluviatilis), one of the most important species in coastal fisheries in northern Baltic Sea, and examined the factors that determine perch recruitment success. We hypothesized that perch spawning population biomass and summer water temperature would increase perch recruitment, with potential density dependence, while the effect of the population size of pikeperch (Sander lucioperca) would be negative. Different forms of general stockrecruitment functions, with and without density dependence, and with and without water temperature and pikeperch population size as environmental factors were fitted to long-term (1981-2014) stock assessment data of perch and pikeperch in the Archipelago Sea, southwestern coast of Finland. Perch spawning stock biomass (ages 5-14), water temperature in June-July and pikeperch stock size (ages C 1) at spawning year best explained variation in perch recruitment. The results supported the predictions: perch recruitment increased with spawning stock in density-dependent manner, pikeperch effect on perch recruitment was negative and summer temperature effect was positive suggesting environmentally affected competitive interaction between these two percids.

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Perch (Perca fluviatilis) and pikeperch (Sander lucioperca) in the diet of the great cormorant (Phalacrocorax carbo) and effects on catches in the Archipelago Sea, Southwest coast of Finland

Cited by 29 publications

References 29 publications

Great cormorant (Phalacrocorax carbo) predation on pikeperch (Sander lucioperca L.) in shallow eutrophic lakes in Poland

Great cormorant (Phalacrocorax carbo) predation on pikeperch (Sander lucioperca L.) in shallow eutrophic lakes in Poland

Probabilistic maturation reaction norm trends reveal decreased size and age at maturation in an intensively harvested stock of pikeperch Sander lucioperca

Effects of water temperature and pikeperch (Sander lucioperca) abundance on the stock–recruitment relationship of Eurasian perch (Perca fluviatilis) in the northern Baltic Sea

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