---
kind: "unit"
title: "40"
title_heading: "Protection of Environment"
key: "chI/subchN/part451"
level: "part"
label: "Part 451"
heading: "Concentrated Aquatic Animal Production Point Source Category"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/40/chI-subchN-part451"
sections_count: 13
---

# Part 451 — Concentrated Aquatic Animal Production Point Source Category

Title 40 C.F.R. — Protection of Environment › Chapter I — Environmental Protection Agency › Subchapter N — Effluent Guidelines and Standards

## Sections

- [§451.1. General applicability.](/cfr/40/451.1.md)
- [§451.2. General definitions.](/cfr/40/451.2.md)
- [§451.3. General reporting requirements.](/cfr/40/451.3.md)

## Contents

- [Subpart A — Flow-Through and Recirculating Systems Subcategory](/cfr/40/chI-subchN-part451-subpartA.md)
- [Subpart B — Net Pen Subcategory](/cfr/40/chI-subchN-part451-subpartB.md)