{"id":72,"date":"2026-02-18T20:11:29","date_gmt":"2026-02-18T20:11:29","guid":{"rendered":"http:\/\/behavior-tools.com\/?page_id=72"},"modified":"2026-02-18T20:11:29","modified_gmt":"2026-02-18T20:11:29","slug":"shoaling-assay-en","status":"publish","type":"page","link":"https:\/\/behavior-tools.com\/index.php\/shoaling-assay-en\/","title":{"rendered":"SHOALING ASSAY (EN)"},"content":{"rendered":"\n<h1 class=\"wp-block-heading\">Shoaling Behavior Assay in Zebrafish<\/h1>\n\n\n\n<h2 class=\"wp-block-heading\">Scientific Overview<\/h2>\n\n\n\n<p>Shoaling behavior is a fundamental social phenotype in zebrafish (Danio rerio), characterized by the tendency to aggregate with conspecifics. Shoaling reflects social cohesion, stress regulation, predator avoidance, and group decision-making.<\/p>\n\n\n\n<p>Alterations in shoal cohesion are sensitive indicators of neurodevelopmental toxicity, stress exposure, and pharmacological modulation.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">1. Historical Background<\/h2>\n\n\n\n<p>Shoaling quantification in zebrafish was systematically characterized in the early 2000s.<\/p>\n\n\n\n<p>Foundational work by:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Robert Gerlai<\/li>\n<\/ul>\n\n\n\n<p>Key references:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gerlai et al., 2000. <em>Behavioural Brain Research<\/em><br>DOI: 10.1016\/S0166-4328(99)00167-5<\/li>\n\n\n\n<li>Miller &amp; Gerlai, 2011. <em>Behavioural Brain Research<\/em><br>DOI: 10.1016\/j.bbr.2010.12.013<\/li>\n\n\n\n<li>Buske &amp; Gerlai, 2011. <em>Developmental Psychobiology<\/em><br>DOI: 10.1002\/dev.20531<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">2. Neurobiological Basis<\/h2>\n\n\n\n<p>Shoaling involves:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Dopaminergic reward pathways<\/li>\n\n\n\n<li>Oxytocin\/vasotocin systems<\/li>\n\n\n\n<li>Serotonergic modulation<\/li>\n\n\n\n<li>Visual and lateral line sensory integration<\/li>\n<\/ul>\n\n\n\n<p>Stress hormones (cortisol) modulate inter-individual distance.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">3. Scientific Objectives<\/h2>\n\n\n\n<p>The assay measures:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Inter-individual distance (IID)<\/li>\n\n\n\n<li>Nearest neighbor distance (NND)<\/li>\n\n\n\n<li>Shoal area<\/li>\n\n\n\n<li>Polarization index<\/li>\n\n\n\n<li>Group cohesion dynamics<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">4. Standardized Experimental Methodology<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\">Apparatus<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Open tank (30 \u00d7 30 \u00d7 10 cm)<\/li>\n\n\n\n<li>4\u201310 fish per shoal<\/li>\n\n\n\n<li>Water: 28 \u00b1 0.5 \u00b0C<\/li>\n\n\n\n<li>Illumination: 150 lux<\/li>\n\n\n\n<li>Recording duration: 10 minutes<\/li>\n\n\n\n<li>Top-view video acquisition (\u226530 fps)<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Procedure<\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Acclimate shoal for 10 minutes.<\/li>\n\n\n\n<li>Begin recording.<\/li>\n\n\n\n<li>Automated multi-animal tracking (e.g., idTracker, EthoVision).<\/li>\n<\/ol>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Primary Endpoints<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Mean inter-individual distance<\/li>\n\n\n\n<li>Shoal dispersion index<\/li>\n\n\n\n<li>Time spent cohesive vs dispersed<\/li>\n\n\n\n<li>Average swimming velocity<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">Positive Controls<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Ethanol (1%) \u2192 increased dispersion<\/li>\n\n\n\n<li>Fluoxetine \u2192 increased cohesion<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">5. Statistical Analysis<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Repeated-measures ANOVA<\/li>\n\n\n\n<li>Multivariate clustering<\/li>\n\n\n\n<li>Social network analysis metrics<\/li>\n\n\n\n<li>Mixed-effect modeling<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">6. Applications<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Autism spectrum disorder models<\/li>\n\n\n\n<li>Developmental neurotoxicity screening<\/li>\n\n\n\n<li>Heavy metal exposure (lead, mercury)<\/li>\n\n\n\n<li>Endocrine disruptor testing<\/li>\n\n\n\n<li>Genetic knock-out validation<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">7. Limitations<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Density effects<\/li>\n\n\n\n<li>Sex ratio variability<\/li>\n\n\n\n<li>Tank size dependency<\/li>\n\n\n\n<li>Hierarchical dominance confounds<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">8. OECD Regulatory Context<\/h2>\n\n\n\n<p>Shoaling is not currently standardized under OECD TGs, but relevant for:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>OECD TG 210 (Early Life Stage Toxicity)<\/li>\n\n\n\n<li>OECD TG 236 (Fish Embryo Toxicity)<\/li>\n<\/ul>\n\n\n\n<p>It is being evaluated as a sublethal behavioral biomarker in developmental neurotoxicity discussions.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\">9. Key Scientific References<\/h2>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Gerlai et al., 2000. DOI: 10.1016\/S0166-4328(99)00167-5<\/li>\n\n\n\n<li>Miller &amp; Gerlai, 2011. DOI: 10.1016\/j.bbr.2010.12.013<\/li>\n\n\n\n<li>Buske &amp; Gerlai, 2011. DOI: 10.1002\/dev.20531<\/li>\n\n\n\n<li>Tang et al., 2020. DOI: 10.1038\/s41398-020-0783-7<\/li>\n\n\n\n<li>Stewart et al., 2015. DOI: 10.1016\/j.neubiorev.2014.09.018<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>Shoaling Behavior Assay in Zebrafish Scientific Overview Shoaling behavior is a fundamental social phenotype in zebrafish (Danio rerio), characterized by the tendency to aggregate with conspecifics. Shoaling reflects social cohesion, stress regulation, predator avoidance, and group decision-making. Alterations in shoal cohesion are sensitive indicators of neurodevelopmental toxicity, stress exposure, and pharmacological modulation. 1. Historical Background [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-72","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/behavior-tools.com\/index.php\/wp-json\/wp\/v2\/pages\/72","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/behavior-tools.com\/index.php\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/behavior-tools.com\/index.php\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/behavior-tools.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/behavior-tools.com\/index.php\/wp-json\/wp\/v2\/comments?post=72"}],"version-history":[{"count":1,"href":"https:\/\/behavior-tools.com\/index.php\/wp-json\/wp\/v2\/pages\/72\/revisions"}],"predecessor-version":[{"id":73,"href":"https:\/\/behavior-tools.com\/index.php\/wp-json\/wp\/v2\/pages\/72\/revisions\/73"}],"wp:attachment":[{"href":"https:\/\/behavior-tools.com\/index.php\/wp-json\/wp\/v2\/media?parent=72"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}