# Model of collective fish behavior with hydrodynamic interactions

## TL;DR

This paper introduces a new model for fish schooling that integrates behavioral rules with hydrodynamic interactions, revealing new collective behaviors and effects of fluid flow on fish movement.

## Contribution

The model uniquely couples behavioral rules with hydrodynamics, highlighting the importance of fluid interactions in collective fish behavior.

## Key findings

- Emergence of a new 'collective turning' phase
- Fish swim faster on average due to fluid effects
- Flow increases behavioral noise among fish

## Abstract

Fish schooling is often modeled with self-propelled particles subject to phenomenological behavioral rules. Although fish are known to sense and exploit flow features, these models usually neglect hydrodynamics. Here, we propose a novel model that couples behavioral rules with far-field hydrodynamic interactions. We show that (1) a new "collective turning" phase emerges; (2) on average individuals swim faster thanks to the fluid; (3) the flow enhances behavioral noise. The results of this model suggest that hydrodynamic effects should be considered to fully understand the collective dynamics of fish.