scholarly journals Features of the species composition and structure of fish communities in small anthropogenic reservoirs with different content of dissolved mineral nitrogen

2021 ◽  
Vol 21 (4) ◽  
pp. 466-477
Author(s):  
Boris G. Kotegov ◽  
Keyword(s):  
Fish Species ◽  
Fish Communities ◽  
Perca Fluviatilis ◽  
Mineral Nitrogen ◽  
Perch Perca Fluviatilis ◽  
Composition And Structure ◽  
Udmurt Republic ◽  
Different Content ◽  
Bleak Alburnus Alburnus ◽  
Species Composition And Structure

In 22 small anthropogenic reservoirs with an area of 0.4 to 62 ha located in the territory of the Udmurt Republic, individuals of different fish species were captured and water samples were taken in late spring for analysis of NO3–, NO2– and NH4+ content. In many reservoirs, concentrations of ammonium exceed the maximum permissible according to the fishing standards for water quality, and in some this is also the case with nitrites. Ponds with zooplanktophages (bleak Alburnus alburnus (L.) and belica Leucaspius delineates (Heckel)) present in fish communities were statistically significantly different in the increased content of total dissolved mineral nitrogen from reservoirs where these two fish species were not registered. In perch and roach reservoirs, the numerical proportion of river perch Perca fluviatilis was negatively and statistically significantly related to the level of their contamination with nitrogen ionic forms.

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.

Competition, predation and environmental factors as structuring forces in freshwater fish communities: Sumari (1971) revisited

1997 ◽  
Vol 54 (1) ◽  
pp. 85-88 ◽  
Author(s):  
L Persson
Keyword(s):  
Abiotic Factors ◽  
Fish Communities ◽  
Perca Fluviatilis ◽  
Rutilus Rutilus ◽  
Apparent Competition ◽  
Roach Rutilus Rutilus ◽  
Data Set ◽  
Factors Affecting ◽  
Perch Perca Fluviatilis ◽  
Species Performance

A study by Sumari (O. Sumari. 1971. Ann. Zool. Fenn. 8: 406-421) of the fish communities in 32 Finnish lakes concluded that the main factors affecting perch (Perca fluviatilis) populations were biotic, of which the competitive interspecific effect of roach (Rutilus rutilus) was the main one analysed. A reanalysis of this data set suggests that abiotic factors such as conductivity and pH are also important in structuring fish communities. It is suggested that abiotic factors affect perch abundance mainly by their effects on other species' performance, particularly roach. The analyses of the whole data set and a subset of this data set consisting of nine lakes having perch only, or perch and piscivores only, also provided evidence that piscivores affect perch biomass. A positive relationship between piscivore biomass and roach biomass suggests that the piscivore-perch-roach interaction may have involved the presence of apparent competition between roach and perch.

scholarly journals МОРФОМЕТРИЧНІ ПОКАЗНИКИ ДЕЯКИХ ВИДІВ РИБ МАЛИХ РІЧОК ЗАХІДНОГО ПОДІЛЛЯ ЯК ІНДИКАТОР ЗАБРУДНЕННЯ ВОДОЙМ

2020 ◽  
Vol 78 (4) ◽  
pp. 35-40
Author(s):  
V. O. Khomenchuk ◽  
B. Z. Lyavrin ◽  
V. Z. Kurant
Keyword(s):  
Fish Species ◽  
Crucian Carp ◽  
Body Height ◽  
Perca Fluviatilis ◽  
Small Rivers ◽  
Trophic Conditions ◽  
Commercial Fish ◽  
Average Mass ◽  
Perch Perca Fluviatilis ◽  
Head Height

The morphometric characteristics of the most common commercial fish were studied: carp – Cyprinus carpio L., pike – Esox lucius L., crucian carp– Carassius auratus gibelio Bloch. and perch – Perca fluviatilis L., two years old, with an average mass of 290–330 g., 300–350 g., 150–230 g. and 170–230 g. respectively, caught from the small rivers of the Western Podillia (Strypa, Seret, Zolota Lypa). It was found, that the indicators of full length, standard length, head length, head height at the back of the head, the largest and smallest body height in carp, crucian carp and perch decreased linearly in a number of rivers Strypa – Seret – Zolota Lypa. It is noted, that the values of the liver index in the investigated fish species differ significantly from the representatives of the rivers Seret and Zolota Lypa compared to the species from the Strip River. This indicator increases in the Strypa – Seret – Zolota Lypa range, except for the pike index, which is of the lowest importance in the representatives of the Seret River. All the fish species studied saw an increase in the gills index in a number of Strypa – Seret – Zolota Lypa rivers. The study demonstrated that the values of the Fulton and Clark fattening coefficients in carp, crucian carp and perch decreased in a number of Strypa – Seret – Zolota Lypa rivers. In pike the highest values of fattening coefficients were noted for fish from the river Seret. Considering the same age of the fish and relatively the same trophic conditions in the studied rivers, it can be assumed, that the differences in morphometric indices are due to different anthropogenic influence on the watercourses. In this case, the least favorable environmental conditions are in the Zolota Lypa river, which is obviously due to its complex pollution.

Do cormorant colonies affect local fish communities in the Baltic Sea?

2012 ◽  
Vol 69 (6) ◽  
pp. 1047-1055 ◽  
Author(s):  
Örjan Östman ◽  
Mikaela Bergenius ◽  
Maria Kristina Boström ◽  
Sven-Gunnar Lunneryd
Keyword(s):  
Baltic Sea ◽  
Colony Size ◽  
Fish Communities ◽  
Perca Fluviatilis ◽  
Great Cormorant ◽  
Phalacrocorax Carbo ◽  
The Baltic Sea ◽  
Management Actions ◽  
Perch Perca Fluviatilis ◽  
The Baltic

The effects that cormorants have on fish communities have been debated, yet few studies have used the necessary controls and replications to make valid and general assessments. Using both a paired design and time series analysis, we studied associations between colony size of the great cormorant ( Phalacrocorax carbo sinesis ) in the Baltic Sea and local fish community composition. Overall, colony size showed few associations with local fish communities. Most evident was a negative association between colony size and perch ( Perca fluviatilis ) abundances in some areas. But for other species, results were nonsignificant or variable among areas. The Baltic Sea cormorant population has increased over the last decades, and our results suggest that management actions to reduce local cormorant colonies may have a positive effect on local perch abundance. Otherwise, our results predict colony reductions to either have variable or weak effects on adjacent local fish communities.

Assessment of Spawning and Nursery Areas in the River Meuse

1994 ◽  
Vol 29 (3) ◽  
pp. 297-299 ◽  
Author(s):  
F. T. Vriese ◽  
S. Semmekrot ◽  
A. J. P. Raat
Keyword(s):  
Fish Species ◽  
Perca Fluviatilis ◽  
Main Stream ◽  
Nursery Areas ◽  
Barbus Barbus ◽  
River Meuse ◽  
Perch Perca Fluviatilis ◽  
Chondrostoma Nasus ◽  
Leuciscus Idus ◽  
Tench Tinca Tinca

In commission of Rijkswaterstaat Directorate Limburg, a desk study was carried out by the OVB to assess whether fish species in the river Meuse are restricted in their abundance and distribution by the lack of appropriate spawning habitat. The area studied comprises the Dutch part of the river between Eijsden and Hedel, including old river arms and former gravel pits connected with the main stream. Not included in the study is the Grensmaas, a non-canalised stretch of the river. A total of 21 fish species were selected, whose habitat requirements regarding spawning and growth were collected by a literature survey. The assessment was made by relating habitat-associated factors (water depth, rate of flow, substratum, macrophytes) with fish-specific requirements on spawning and growth. Thus it was possible to assess per river section of 100 meters length its potential suitability as spawning and nursery area for 17 species. It was concluded that no potential spawning and nursery areas are available for barbel (Barbus barbus), chub (Leuciscus cephalus), nose carp (Chondrostoma nasus) and dace (Leuciscus leuciscus). The presence of these species in the study area can be explained by migration out of the Grensmaas. Only on 1.5 % of the total amount of river sections macrophytes are present, which obviously limits the possibilities for the phytophilic species pike (Esox lucius), tench (Tinca tinca), crucian carp (Carassius carassius), carp (Cyprinus carpio), bitterling (Rhode us sericeus amarus), white bream (Blicca bjoerkna) and rudd (Scardinius erythrophthalmus). For ide (Leuciscus idus), gudgeon (Gobio gobio), bleak (Alburnus alburnus), perch (Perca fluviatilis), pikeperch (Stizostedion hicioperca) and ruffe (Gymnocephalus cernua) potential spawning and nursery areas are abundantly present.

scholarly journals Personalities in a crowd: What shapes the behaviour of Eurasian perch and other shoaling fishes?

2012 ◽  
Vol 58 (1) ◽  
pp. 35-44 ◽  
Author(s):  
Carin Magnhagen
Keyword(s):  
Decision Making ◽  
Predation Risk ◽  
Fish Species ◽  
Public Information ◽  
Perca Fluviatilis ◽  
Individual Characteristics ◽  
Eurasian Perch ◽  
Perch Perca Fluviatilis ◽  
Consensus Decision Making ◽  
Consensus Decision

Abstract Lately, there has been an increasing interest in intraspecific variation in behaviour, and numerous studies on personality have been performed in a variety of animals, including several fish species. Individuals have been divided into coping style categories or arranged along a behaviour gradient, such as the bold/shy continuum. However, many fish species live in groups, and the social environment can influence the behaviour of an animal in different ways. There may be conflicts within groups due to competition for resources, and dominance hierarchies are commonly found. On the other hand, there are many benefits of consensus decision-making within the group. Conformity of behaviour is probably adaptive, due to the benefit of public information on, for example, food resources and predation risk. Accordingly, studies of fish shoals have found evidence of consensus decision-making. Furthermore, factors in the environment, such as predation risk would also influence the behaviour expressed. To be able to understand behaviour patterns in a group of fish, it is necessary to consider the variation of individual characteristics, and how the group, as well as other environmental factors, affects the behaviour of individuals. Here, I will review studies on different aspects of personality within a social context in fish, with a special emphasis on the Eurasian perch Perca fluviatilis.

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