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Related Concept Videos

Aggression01:47

Aggression

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Humans engage in aggression when they seek to cause harm or pain to another person. Aggression takes two forms depending on one’s motives: hostile or instrumental. Hostile aggression is motivated by feelings of anger with intent to cause pain; a fight in a bar with a stranger is an example of hostile aggression. In contrast, instrumental aggression is motivated by achieving a goal and does not necessarily involve intent to cause pain (Berkowitz, 1993); a contract killer who murders for...
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The loudness of a sound source is related to how energetically the source is vibrating, consequently making the molecules of the propagation medium vibrate. To measure the loudness of a source, the physical quantity of interest is the intensity. This is defined as the energy emitted per unit of time per unit of area perpendicular to the sound wave's propagation direction. Since the total energy is greater if the source vibrates for a longer duration and over a larger area, dividing the...
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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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Humans perceive sound by hearing. The human ear helps sound waves reach the brain, which then interprets the waves and creates the perception of hearing. The loudness of the environment in which a person is located determines whether they can distinguish between different sound sources.
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Nuances in fish combat: Exploring male and female differences in the agonistic behavior of an Amazonian cichlid.

Behavioural processes·2025
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Lower light intensity reduces larval aggression in matrinxã, Brycon amazonicus.

Ana Caroliny C Lopes1, Marle Angélica Villacorta-Correa2, Thaís B Carvalho3

  • 1Programa de Pós-graduação em Aquicultura, Universidade Nilton Lins e Instituto Nacional de Pesquisas da Amazônia, Manaus, AM, Brazil.

Behavioural Processes
|February 8, 2018
PubMed
Summary

Lower light intensity reduces aggression and activity in Brycon amazonicus larvae, a key finding for improving intensive fish farming conditions and developing new aquaculture technologies.

Keywords:
AggressivenessFishLarvicultureLuminositySurvival

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Area of Science:

  • Aquaculture
  • Animal Behavior
  • Ichthyology

Background:

  • Aggressive behavior in Brycon amazonicus can limit intensive farming success.
  • Environmental factors, such as light, can influence fish social interactions and reduce aggression.

Purpose of the Study:

  • To investigate the effect of different light intensities on the aggressive behavior and activity of Brycon amazonicus larvae.
  • To determine if light intensity can be manipulated to mitigate aggression in farmed fish.

Main Methods:

  • Groups of three Brycon amazonicus larvae were exposed to low, intermediate, and high light intensities (17±3 lx, 204±12.17 lx, and 1,613.33±499.03 lx, respectively).
  • Eight replicates were used for each light intensity level.
  • Aggressive interactions and locomotor activity were recorded and analyzed.

Main Results:

  • Lower light intensity significantly reduced the frequency of aggressive interactions among Brycon amazonicus larvae.
  • Reduced light intensity also led to decreased locomotor activity in the larvae.
  • A clear modulation of social behavior was observed in response to varying light levels.

Conclusions:

  • Light intensity is a critical factor that modulates aggression in Brycon amazonicus larvae.
  • Manipulating light intensity offers a potential strategy to improve social conditions and reduce stress in farmed Brycon amazonicus.
  • This finding can contribute to the development of more sustainable and efficient aquaculture technologies for this species.