Zebrafish Social Preference (Shoaling)
Overview
The zebrafish social preference test measures shoaling motivation, the innate drive of zebrafish to aggregate with conspecifics, by quantifying the time a focal fish spends near a visible group of conspecifics versus an empty compartment. The apparatus uses a rectangular tank divided into three virtual zones: a social zone adjacent to a stimulus chamber containing 3-5 conspecifics, a central neutral zone, and a non-social zone adjacent to an empty or object-containing chamber. Shoaling behavior is regulated by the posterior tuberculum dopaminergic system and the social decision-making network in the dorsomedial telencephalon, homologous to the mammalian medial amygdala and ventromedial hypothalamus circuit that governs affiliative behavior.
The primary metric is the sociability index, calculated as (time in social zone minus time in non-social zone) divided by total time, yielding values from -1 (complete social avoidance) to +1 (maximal social preference). Additional dependent variables include absolute time in each zone, number of approaches to the social stimulus (entries into the social zone), mean distance from the stimulus shoal, latency to first social approach, and locomotor parameters across zones. Interfish distance and orientation relative to the shoal can be computed when tracking resolution permits individual identification of stimulus fish.
ConductMaze defines the social, neutral, and non-social zones based on tank geometry and stimulus chamber placement, then tracks the focal fish position in real time using overhead camera. The system computes zone occupancy, sociability index, approach frequency, and distance-to-stimulus metrics with per-minute temporal resolution. Integrated stimulus chamber detection verifies shoal presence throughout the trial, and batch processing supports multi-lane configurations for parallel social screening.
Trial Flow
Apparatus Setup
Fill test tank and stimulus chambers with system water (26-28 C); position shoal stimulus fish (3-5) in one end chamber
Zone Definition
Define social, neutral, and non-social zones in tracking software based on tank layout
Acclimation
Place focal fish in center zone with opaque dividers for 5-minute acclimation period
Divider Removal
Remove opaque barriers to allow visual access to both end chambers simultaneously
Free Exploration
Focal fish freely swims for 10 minutes while position is tracked at 30 fps
Zone Classification
Classify each tracked frame as social, neutral, or non-social zone occupancy
Metric Computation
Calculate sociability index, zone times, approach count, distance to shoal, and locomotor metrics
Trial End
Return focal fish to home tank; rotate stimulus fish between subjects to prevent fatigue
Parameters
| Parameter | Type | Default | Description |
|---|---|---|---|
| Test Duration | duration | 600 | Total exploration time after divider removal in seconds (standard 10 min) |
| Water Temperature | temperature | 27.0 | System water temperature in degrees Celsius (26-28 C optimal) |
| Tank Length | distance | 36.0 | Test tank length in centimeters |
| Tank Width | distance | 20.0 | Test tank width in centimeters |
| Water Depth | distance | 12.0 | Water depth in centimeters |
| Stimulus Shoal Size | integer | 4 | Number of conspecifics in the stimulus chamber |
| Social Zone Width | distance | 10.0 | Width of the social and non-social zones in centimeters from the stimulus wall |
| Acclimation Period | seconds | 300 | Duration of center-zone acclimation with dividers in seconds |
| Time Bin Size | seconds | 60 | Time bin duration for temporal sociability analysis in seconds |
Metrics
| Metric | Unit | Description |
|---|---|---|
| Sociability Index | ratio | (Social time - Non-social time) / total time; range -1 to +1 |
| Social Zone Time | seconds | Total time spent in the zone adjacent to the stimulus shoal |
| Non-Social Zone Time | seconds | Total time spent in the zone adjacent to the empty chamber |
| Social Approaches | count | Number of entries into the social zone from the neutral zone |
| Mean Distance to Shoal | cm | Average distance from focal fish to the stimulus chamber wall |
| Latency to Social Zone | seconds | Time from divider removal to first entry into the social zone |
| Total Distance | cm | Cumulative distance swum by the focal fish across all zones |
Sample Data
| Subject | Treatment | Sociability Index | Social Time (s) | Non-Social Time (s) | Social Approaches | Distance to Shoal (cm) |
|---|
Representative data for illustration purposes. Actual values will vary by species, strain, and experimental conditions.
Applications
- 1Autism spectrum disorder modeling — phenotyping social deficits in shank3, cntnap2, and other ASD-associated zebrafish mutant lines
- 2Prosocial drug discovery — screening oxytocin analogs, vasopressin receptor agonists, and MDMA-like compounds for sociability enhancement
- 3Developmental social neuroscience — determining critical windows during which social isolation impairs adult shoaling behavior
- 4Social contagion of anxiety — measuring how stressed stimulus fish alter focal fish approach-avoidance behavior via alarm cues
- 5High-throughput social phenotyping — parallel multi-lane screening of chemical libraries for social behavioral modulators
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