Variations in Year-Class Strength of Different Perch (<i>Perca fluviatilis</i>) Populations in the Baltic Sea with Special Reference to Temperature and Pollution

Böhling, Paula; Hudd, Richard; Lehtonen, Hannu; Karås, Peter; Neuman, Erik; Thoresson, Gunnar

doi:10.1139/f91-142

Cited by 45 publications

(37 citation statements)

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“…The harvest of perch has increased in Lake Peipsi and strong year-classes of this species have occurred more frequently in Lake Säkylän Pyhäjärvi and in Lake Søbygaard, although in the latter it may also be attributed to a major reduction in nutrient loading. Other studies have also found strong year classes of perch to be associated with warm summers (Böhling et al, 1991;Lappalainen et al, 1996;Sarvala & Helminen, 1996;Mehner et al, 1998;Paxton et al, 2004), and in Lake Pyhäselkä in north -1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 eastern Finland perch density increased with increasing temperature from 1975 to 2005…”

Section: Discussionmentioning

confidence: 88%

“…Moreover, triggered by the more frequent warmer summers, strong year classes of perch 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 (Böhling et al, 1991;Sarvala & Helminen, 1996) have appeared more often in the 1990s and 2000s than in the 1970s or 1980s (Sarvala & Helminen, 1996 and unpublished), increasing predation on vendace, and we may expect this trend to continue.…”

Section: Lake Säkylän Pyhäjärvi: Major Decline In Vendacementioning

confidence: 99%

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Impacts of climate warming on the long-term dynamics of key fish species in 24 European lakes

et al. 2012

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10.1007/s10750-012-1182-1Contact CEH NORA team at noraceh@ceh.ac.ukThe NERC and CEH trademarks and logos ('the Trademarks') are registered trademarks of NERC in the UK and other countries, and may not be used without the prior written consent of the Trademark owner. form, nor will it be during the first three months after its submission to Hydrobiologia."Corresponding author: Erik Jeppesen (ej@dmu.dk)We dedicate this paper to the late Prof. Jürgen Benndorf, a true pioneer and mentor in lake and reservoir management oriented research, who inspired a number of us to initiate longterm comprehensive experimental ecological studies on lakes and reservoirs. AbstractFish play a key role in the trophic dynamics of lakes. With climate warming, complex changes in fish assemblage structure may be expected owing to direct effects of temperature and indirect effects operating through eutrophication, water level changes, stratification and salinisation. We reviewed published and new long-term (10-100 years) fish data series from 24 European lakes (area: 0.04-5648 km 2 ; mean depth: 1-177m; a north-south gradient from 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 4 Sweden to Spain). Along with an annual temperature increase of about 0.15-0.3 °C per decade profound changes have occurred in either fish assemblage composition, body size and/or age structure during recent decades and a shift towards higher dominance of eurythermal species.These shifts have occurred despite a reduction in nutrient loading in many of the lakes that should have benefited the larger-sized individuals and the fish species typically inhabiting cold-water, low-nutrient lakes. The cold-stenothermic Arctic charr has been particularly affected and its abundance has decreased in the majority of the lakes where its presence was recorded. The harvest of cool-stenothermal trout has decreased substantially in two southern lakes. Vendace, whitefish and smelt show a different response depending on lake depth and latitude. Perch has apparently been stimulated in the north, with stronger year classes in warm years, but its abundance has declined in the southern Lake Maggiore, Italy. Where introduced, roach seems to take advantage of the higher temperature after years of low population densities. Eurythermal species such as common bream, pike-perch and/or shad are apparently on the increase in several of the lakes. The response of fish to the warming has been surprisingly strong and fast in recent decades, making them ideal sentinels for detecting and documenting climate-induced modifications of freshwater ecosystems.

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Section: Discussionmentioning

confidence: 88%

Section: Lake Säkylän Pyhäjärvi: Major Decline In Vendacementioning

confidence: 99%

Impacts of climate warming on the long-term dynamics of key fish species in 24 European lakes

et al. 2012

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“…The year-class strength of pikeperch varies strongly between years , but the annual year-class variations of different populations show similar patterns over spatial distances of 300-500 km in Finland (Lappalainen and Lehtonen 2002). Such patterns are clear indications for the positive effects of climatic factors on year-class formations (Böhling et al 1991;Myers et al 1997;. The contribution of a strong year-class to the future fisheries may be significant, thus the understanding of the effects of temperature on the year-class formation is important.…”

Section: Introductionmentioning

confidence: 97%

“…Water temperature is known to have positive effects on the establishment of strong pikeperch year-classes (Böhling et al 1991;Kjellman et al 2003). As a new approach, we have calculated the year-class catch by summing the commercial catch in numbers from each year-class in successive years (indicating year-class strength), based on the reported catches and catch samples from the commercial fishery .…”

Section: Introductionmentioning

confidence: 99%

Climate Warming and Pikeperch Year-Class Catches in the Baltic Sea

Pekcan‐Hekim

Urho²,

Auvinen³

et al. 2011

AMBIO

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Climate change scenarios concerning the Baltic Sea predict increase in surface water temperatures. Pikeperch (Sander lucioperca (L.)) inhabits the coastal areas of the northern Baltic Sea and is an important fish species for the Finnish fisheries. The year-class strength of pikeperch varies strongly between years and significantly depends on water temperature. We aimed to study the effects of changing temperature conditions on pikeperch fisheries and distribution based on commercial catch data from the period 1980-2008 in the Finnish coastal areas of the Baltic Sea. The results indicated that warmer summers will produce stronger pikeperch year-classes that consequently contribute significantly to the future catches. The average temperature in June-July explained 40% of the variation in the year-class catches in the Gulf of Finland and 73% in July-August in the Archipelago Sea. During the study period, the distribution of pikeperch catches expanded toward north along the coasts of the Bothnian Sea.

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“…were particularly abundant in 1988 which was a very favorable year for spring spawning fish species e .g . perch (Bohling et al ., 1991) .…”

Section: Discussionmentioning

confidence: 99%

Hydroacoustic monitoring of the distribution, density and the mass-removal of pelagic fish in a eutrophic lake

Jurvelius¹,

Sammalkorpi²

1995

Hydrobiologia

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A large scale biomanipulation of pelagic fish by trawling was started in the eutrophic Enonselka basin (26 km 2 ) of Lake Vesijdrvi to improve the water quality which had remained poor in spite of the termination of nutrient loading . The distribution and density of the fish were studied by hydroacoustics before and during the removal . The initial annual fish density varied between 13 000-21 000 fish ha -' in the study area in August 1984-89 . The mass-removal of the fish by pelagic trawling took place in 1989-1992 . The catch varied annually between 64 and 92 kg ha -1 . Roach (Rutilus rutilus (L.)) and smelt (Osmerus eperlanus (L .)) accounted for c . 85% of the weight of the catch . The mass-removal decreased the pelagic fish density in the Enonselka basin during the trawling . An increase in the density was observed after the trawling ceased in these years, and the initial density level was reached within one month . The density level after mass-removal remained high compared with oligotrophic lakes . The pelagic fish had a diurnal ascending trend with the decreasing light intensity in August, and the fish were significantly (p < 0 .01) higher in the water mass in temperature non-stratified water in autumn than in stratified water in summer. The fish were somewhat deeper in the years of mass-removal than before it . Mass-removal did not affect the individual length of the echosurveyed fish . Fish smaller than c . 15 cm (TS < -44 dB ; mainly smelt) were numerically dominant throughout the whole study period .

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Variations in Year-Class Strength of Different Perch (Perca fluviatilis) Populations in the Baltic Sea with Special Reference to Temperature and Pollution

Cited by 45 publications

References 1 publication

Impacts of climate warming on the long-term dynamics of key fish species in 24 European lakes

Impacts of climate warming on the long-term dynamics of key fish species in 24 European lakes

Climate Warming and Pikeperch Year-Class Catches in the Baltic Sea

Hydroacoustic monitoring of the distribution, density and the mass-removal of pelagic fish in a eutrophic lake

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