Population Dynamics of Percids in Lake IJssel and some Smaller Lakes in The Netherlands

1977 ◽  
Vol 34 (10) ◽  
pp. 1710-1719 ◽  
Author(s):  
J. Willemsen
Keyword(s):  
Population Dynamics ◽  
Perca Fluviatilis ◽  
First Year ◽  
Homing Behavior ◽  
Perch Perca Fluviatilis ◽  
Class Strength ◽  
High Summer Temperature ◽  
Dependent Growth ◽  
First Year Of Life ◽  
Slow Growing

Pikeperch (Stizostedion lucioperca) and Eurasian perch (Perca fluviatilis) in Lake IJssel both prey mainly upon the very abundant smelt (Osmerus eperlanus). But competition for food is of little or no importance and growth is not density-dependent. Growth rates for perch and ruffe (Gymnocephalus cernua) in some lakes are exceptionally rapid, mean lengths after 3 yr being 24 and 18 cm, respectively. Very intensive fishing for pikeperch (total annual mortality 81%) in the season before first spawning removes particularly the fast-growing fish from the population, thus restricting reproduction mainly to the slow-growing pikeperch. Year-class strength of pikeperch is strongly favored by a high summer temperature during the first year of life. Strong year-classes of pikeperch in Lake IJssel are characterized by a mean length of the young-of-the-year of 14.5 cm or more. Migration of pikeperch and perch in Lake IJssel is restricted. When transported to other areas of the lake, both species showed a distinct homing behavior. Key words: Percidae, population dynamics, Stizostedion, Perca, Gymnocephalus

Individual responses to predation risk and food density in perch (Perca fluviatilis L.)

1997 ◽  
Vol 75 (12) ◽  
pp. 2027-2035 ◽  
Author(s):  
A. C. W. Utne ◽  
E. Brännäs ◽  
C. Magnhagen
Keyword(s):  
Predation Risk ◽  
Perca Fluviatilis ◽  
Individual Characteristics ◽  
Food Distribution ◽  
Food Density ◽  
Patch Choice ◽  
Stage Of Development ◽  
Perch Perca Fluviatilis ◽  
Mature Fish ◽  
Slow Growing

Perch, Perca fluviatilis, of different sizes and ages were allowed to choose between two feeding patches differing in food ratio and (or) predation risk (presence versus absence of a pike, Esox lucius). The aim of our study was to test whether food-patch choice and risk-taking behaviour (time with the predator present) were related to size, phenotype (fast- versus slow-growing) and (or) stage of development (mature versus immature). Movements of individual fish were continuously monitored with an automatic system employing passive integrated transponder (PIT) tags. Food distribution did not seem to be important in determining perch distribution. Predation risk, however, had a significant influence. The presence of a predator in a patch significantly reduced the proportion of time spent in that feeding patch by all perch. However, the strength of this effect was dependent on individual characteristics, both the slow-growing phenotype and the mature fish spending a significantly lower proportion of time in the risky patch than the fast-growing and immature fish. Switching rates, which differed between character groups, also had an effect on growth rate, varying with predation risk.

Drivers of walleye recruitment in Minnesota’s large lakes

2020 ◽  
Vol 77 (12) ◽  
pp. 1921-1933
Author(s):  
Andrew E. Honsey ◽  
Zachary S. Feiner ◽  
Gretchen J.A. Hansen
Keyword(s):  
Thermal Conditions ◽  
Predictive Performance ◽  
First Year ◽  
Large Lakes ◽  
Substantial Impact ◽  
Inland Lakes ◽  
Growing Seasons ◽  
Class Strength ◽  
Explained Variance ◽  
First Year Of Life

Fish recruitment is complex and difficult to predict. Data-driven approaches show promise for predicting recruitment and understanding its drivers. We used a random forest model to infer relationships between year-class strength and 17 variables describing potential recruitment drivers across 30+ years of walleye (Sander vitreus) data from Minnesota’s nine largest inland lakes. Our model explained 20% of the variation in year-class strength overall, with predictive performance varying among lakes (–8% to 37% explained variance). Of the variables analyzed, degree-days during the first year of life and first winter severity were the most important for predicting recruitment, with relatively weak year classes predicted to occur with cold first growing seasons and severe first winters. Other thermal variables were secondarily important predictors of year-class strength. Predicted year-class strength was positively related to stock size and stocking and negatively related to the presence of invasive species; however, these variables were less important than thermal variables. Our results indicate that thermal conditions in early life can have a substantial impact on walleye recruitment and highlight the potential for differing recruitment drivers and dynamics among lakes.

Influence of Water Clarity on the Catchability of Six Freshwater Fish Species in Bottom Trawls

1992 ◽  
Vol 49 (5) ◽  
pp. 885-893 ◽  
Author(s):  
Anthone D. Buijse ◽  
Leendert A. Schaap ◽  
Tammo P. Bust
Keyword(s):  
Light Intensity ◽  
Fish Species ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Water Clarity ◽  
Roach Rutilus Rutilus ◽  
Bream Abramis Brama ◽  
Perch Perca Fluviatilis ◽  
Class Strength ◽  
Influence Of Water

Bottom trawl surveys are carried out every autumn to estimate the relative abundance of six major fish species, especially that of pikeperch (Stizostedion lucioperca) and Eurasian perch (Perca fluviatilis), in the 182 000-ha Lake IJssel, The Netherlands. The catchability of these species is influenced by light intensity at the bottom and therefore by water clarity and water depth. In autumn, water clarity can differ greatly from day to day because of wind-mediated resuspension of sediments. Catchability of ruffe (Gymnocephalus cernua) and age 0 pikeperch showed a significant inverse relationship with light intensity at the bottom, and therefore, a correction should be made when catch data for these species are used to estimate population size or year-class strength. Results were not consistent for perch, while for smelt (Osmerus eperlanus), roach (Rutilus rutilus), and bream (Abramis brama) the influence of light intensity on catchability was not significant. Corrected and uncorrected estimates of the abundance of age 0 pikeperch, based on trawl samples, were compared to demonstrate the effect of water clarity on the estimation of year-class strength. Increased water clarity can lead to zero catches and consequently diminish the effectiveness of sampling programmes.

Rate of growth, mature weight and life-span

1962 ◽  
Vol 156 (962) ◽  
pp. 96-108 ◽  
Keyword(s):  
Kidney Disease ◽  
Life Span ◽  
Early Growth ◽  
First Year ◽  
Fast Growing ◽  
Growing Rats ◽  
Large Numbers ◽  
Lung Infections ◽  
First Year Of Life ◽  
Slow Growing

Rats which were suckled in large numbers to retard their early growth continued to grow slowly even when they were supplied with unlimited food after weaning, and they became small adults. They lived on the average for about the same length of time as much larger rats which had originally been suckled in small numbers to ensure their unrestricted growth. There was a higher mortality among the slow-growing rats in the first year of life but the effect of this was compensated in the slow-growing females by an increase in life-span among those which survived the first year. No such increase was observed in the surviving slow-growing males, and the slow-growing males as a whole had an appreciably shorter expectation of life than the fast-growing ones. The incidence of lung infections was higher in the slow-growing animals; of kidney disease and of tumours in the fast-growing ones. Kidney disease was more common in males and tumours in females. These findings do not support the view that nutritionally retarded growth necessarily promotes longevity, or that it might increase the life-span of a community.

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

1991 ◽  
Vol 48 (7) ◽  
pp. 1181-1187 ◽  
Author(s):  
Paula Böhling ◽  
Richard Hudd ◽  
Hannu Lehtonen ◽  
Peter Karås ◽  
Erik Neuman ◽  
...  
Keyword(s):  
Large Scale ◽  
Age Distribution ◽  
Pulp Mill ◽  
Perca Fluviatilis ◽  
Day Length ◽  
Perch Perca Fluviatilis ◽  
Class Strength ◽  
Pulp Mill Effluents ◽  
Abiotic And Biotic Factors ◽  
The Baltic

Variations in the year-class strength of perch (Perca fluviatilis) were analyzed among 23 populations in Baltic coastal areas distributed between 57 and 66°N using the age distribution in catches. In spite of large differences in abiotic and biotic factors, the variations in year-class strength were similar in 14 of these areas. The similarities could be attributed to large-scale weather variations influencing water temperature. Year-class strength was shown to be correlated with an index based on temperature and day length during the whole first year of life. In two of the nine deviating populations, perch nursery areas are situated in small nearshore freshwaters, where fluctuations in the water level may be more important for recruitment than temperature variations. The other deviating areas were exposed to environmental disturbances, i.e. acidification, oxygen deficits, pulp mill effluents, and thermal discharge, which obviously affected recruitment in a decisive way.

Impact of Brook Trout (Salvelinus fontinalis) Predation on the Crayfish Orconectes virilis in Three Michigan Lakes

1979 ◽  
Vol 36 (10) ◽  
pp. 1191-1196 ◽  
Author(s):  
H. Gowing ◽  
W. T. Momot
Keyword(s):  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
First Year ◽  
Orconectes Virilis ◽  
Trout Population ◽  
Production Growth ◽  
First Year Of Life ◽  
The Cost ◽  
Slow Growing ◽  
Northern Michigan

The crayfish Orconectes virilis is a major component of the benthos of three small lakes in northern Michigan. These lakes contained stocked brook trout (Salvelinus fontinalis) populations (age-0 and age-I) at densities of 188, 411, and 1398 fish/ha. Crayfish were preyed upon by brook trout, but only during their first year of life. Two-year production of age-0 crayfish was approximately 94 kg in each lake; brook trout consumed only about 1–2% in lakes with lower density offish. Even with greater trout density and accompanying higher rate of exploitation (40%), there was no impact on recruitment of young crayfish because compensatory mortality of crayfish occurred in lakes with less trout predation. However, stocking trout at higher densities decreased trout growth and condition. While 2-yr production was highest (59 kg/ha) in the lake stocked at the highest density and lowest (17 kg/ha) in one stocked at the lowest density, the former was achieved at the cost of a very slow growing trout population. Most of the crayfish production is not utilized as trout food but enters the non-predatory pool of detrital organic matter. Key words: Orconectes virilis, brook trout, predation, production growth, mortality

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