نتایج جستجو برای: perca

تعداد نتایج: 652  

Journal: :Diklat Review : Jurnal manajemen pendidikan dan pelatihan 2019

Journal: :Revista Ibero-Americana de Humanidades, Ciências e Educação 2022

A educação infantil é a primeira etapa da básica, por meio qual as crianças iniciam sua jornada para formal e passam vivenciar novos aprendizados que promovem o desenvolvimento psicomotor social, como física. Portanto, objetivo deste estudo discutir importância física na infantil. Utilizou-se pesquisa bibliográfica com abordagem qualitativa. Os resultados mostraram que, embora seja um currículo...

Journal: :Knowledge and Management of Aquatic Ecosystems 2023

Ecological studies on native and invasive populations of European perch Perca fluviatilis pumpkinseed Lepomis gibbosus are often based stable isotope (SI) analysis dorsal muscle, where samples usually taken from sacrificed fishes. However, other tissues, such as scale fin tissue, can be used non-lethal alternatives, their SI values standardised to muscle for comparative purposes. In both pumpki...

2001
Vera P. Nikolic Predrag D. Simonovic

In the sample of 83 specimens of the perch (Perca fluviatilis L., 1758), caught on eight different sampling sites at the Vlasinsko Lake reservoir, in April–October 1993, 25 infested specimens were found. They were infested with the following species of parasitic ciliates: Trichodinella epizootica, Apiosoma robustum, Apiosoma piscicolum ssp. perci, Ichthyophthirius multifiliis, Chilodonella cypr...

2017
Carin Magnhagen Kajsa Johansson Peter Sigray

The negative impact of anthropogenic noise on marine animals is receiving increasing attention. In order to study the effect of motorboat noise on foraging behaviour in fish, we chose 2 species with different hearing abilities. The roach Rutilus rutilus has a better developed sense of hearing than the Eurasian perch Perca fluviatilis. The study took place in an inlet of the Bothnian Sea where b...

2004
H. E. RICHMOND T. R. HRABIK A. F. MENSINGER

The ability of age-0 year yellow perch Perca flavescans to detect prey using visual and mechanosensory input was examined during laboratory feeding trials at varying light intensities. Perch were highly effective predators and captured Daphnia pulicaria with 94% overall foraging success at light levels ranging from 0 to 3400 lx. Maximum average reaction distances (5 0 0 8 cm, mean S.E.) occurre...

2016
Anssi Vainikka Ilkka Tammela Pekka Hyvärinen

Consistent individual differences (CIDs) in behavior are of interest to both basic and applied research, because any selection acting on them could induce evolution of animal behavior. It has been suggested that CIDs in the behavior of fish might explain individual differences in vulnerability to fishing. If so, fishing could impose selection on fish behavior. In this study, we assessed boldnes...

Journal: :Ecotoxicology and environmental safety 2014
Ali Azizishirazi William A Dew Berenice Bougas Mehdi Dashtban Louis Bernatchez Greg G Pyle

The olfactory system of fish is sensitive to the toxic effects of low concentrations of contaminants. To investigate the effects of long-term metal exposure on olfaction in wild yellow perch (Perca flavescens), fish from one clean (Geneva Lake) and two metal-contaminated lakes (Ramsey and Hannah lakes) were collected in and around the metal-mining district of Sudbury, ON. Two different techniqu...

2014
Lynn Ranåker Jens Persson Mikael Jönsson P. Anders Nilsson Christer Brönmark

Environmental change may affect predator-prey interactions in lakes through deterioration of visual conditions affecting foraging success of visually oriented predators. Environmental change in lakes includes an increase in humic matter causing browner water and reduced visibility, affecting the behavioural performance of both piscivores and prey. We studied diurnal patterns of prey selection i...

2017
Lindsay J. Henderson Mary R. Ryan Hannah M. Rowland

In freshwater environments, chemosensory cues play an important role in predator-prey interactions. Prey use a variety of chemosensory cues to detect and avoid predators. However, whether predators use the chemical cues released by disturbed or stressed prey has received less attention. Here we tested the hypothesis that the disturbance cue cortisol, in conjunction with visual cues of prey, ele...

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