Editing Atlantic cod (section)

===Shoaling===
[[File:Kabeljauwen houden zich op bij een wrak en bevrijden zichzelf-4885741.webm|upright=1.35|thumb|[[Shoaling and schooling|Shoaling]] Atlantic cod on a wreck in the [[North Sea]]]]

Atlantic cod are a [[Shoaling and schooling|shoaling]] species and move in large, size-structured aggregations. Larger fish act as scouts and lead the shoal's direction, particularly during post [[Spawn (biology)|spawning]] [[Fish migration|migrations]] inshore for feeding. Cod actively feed during migration and changes in shoal structure occur when food is encountered. Shoals are generally thought to be relatively leaderless, with all fish having equal status and an equal distribution of resources and benefits.<ref name=Pitcher>{{cite book|last=Pitcher|first=TJ, Parrish JK|title=Functions of shoaling behaviour in teleosts|year=1993|publisher=Chapman and Hall|pages=363–427}}</ref>  However, some studies suggest that leading fish gain certain feeding benefits. One study of a migrating Atlantic cod shoal showed significant variability in feeding habits based on size and position in the shoal. Larger scouts consumed a more variable, higher quantity of food, while trailing fish had less variable diets and consumed less food. Fish distribution throughout the shoal seems to be dictated by fish size, and ultimately, the smaller lagging fish likely benefit from shoaling because they are more successful in feeding in the shoal than they would be if migrating individually, due to social facilitation.<ref name=DeBlois>{{cite journal|last=DeBlois|first=Elisabeth M.|author2=Rose, George A.|title=Cross-shoal variability in the feeding habits of migrating Atlantic cod (Gadus morhua)|journal=Oecologia|date=1 January 1996|volume=108|issue=1|pages=192–196|doi=10.1007/BF00333231|pmid=28307750|bibcode=1996Oecol.108..192D|s2cid=1592090}}</ref>