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An interactive video-computer tracking system for quantification of locomotor behavior.

C H Royce-Malmgren¹, W H Watson

¹Zoology Department, University of New Hampshire, 03824, Durham, NH.

Journal of Chemical Ecology

|December 5, 2013

Summary

A new interactive computer-video tracking system (ITS) allows researchers to analyze salmonid behavior in response to olfactory stimuli. This cost-effective system reveals that changes in ambient pH significantly alter how juvenile Atlantic salmon react to scents.

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Area of Science:

Ethology
Aquatic Biology
Behavioral Neuroscience

Background:

Understanding fish behavior is crucial for ecological and conservation studies.
Olfactory stimuli play a significant role in fish behavior, influencing migration, foraging, and predator avoidance.
Accurate and flexible behavioral analysis systems are needed to quantify these responses.

Purpose of the Study:

To develop and describe a cost-effective interactive computer-video tracking system (ITS) for behavioral analysis.
To utilize ITS to investigate the behavioral responses of salmonids to olfactory stimulants.
To determine the effect of ambient pH changes on the behavioral response of juvenile Atlantic salmon to olfactory stimuli.

Main Methods:

Developed a system (ITS) comprising an Apple IIe computer, video camera, VCR, and special-effects generator.

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Experiments were videotaped, and playback allowed user-guided tracking of fish using an electronic pen.

The system recorded x-y coordinates, calculating swimming velocity, distance from stimuli, and time spent in areas.

Main Results:

The ITS system proved flexible, affordable, and capable of analyzing various experimental setups, including those with low-contrast backgrounds or crossing tracks.
The system successfully quantified behavioral variables like swimming speed and spatial distribution in response to olfactory cues.
Demonstrated that altered ambient pH significantly modifies the behavioral responses of juvenile Atlantic salmon to olfactory stimuli.

Conclusions:

The interactive computer-video tracking system (ITS) offers a valuable, economical alternative to commercial systems for behavioral analysis.
ITS facilitates detailed analysis of fish behavior, including complex scenarios and long-term experiments.
Ambient pH is a critical environmental factor influencing salmonid olfactory-driven behaviors, with implications for aquatic ecosystem health.