Fish Hiding After Heron Attack: Netting Works, Tonics Don't

Four days post-heron visit, fish remain bottom-hugging and food-refusing. No tonic restores confidence — only physical exclusion of the predator does.

Why Tonics Fail

• "Stress coat" products help slime coat — they don't rewrite instinct.
• Fish associate surface = death. That memory lasts weeks to months.
• Adding chemicals without fixing the threat = false security.

What Actually Works

1. Pond netting (½" mesh): Only 100% heron deterrent. Install tight, tented, secured.
2. Motion-activated sprinkler: Backup for mammals (raccoons, cats).
3. Deep refuge (3+ ft): Fish need a "bunker" they trust.
4. Consistent routine: Same feeder, same time, quiet approach.

Recovery Timeline With Netting

• Week 1: Still hiding, but less panic.
• Week 2–3: Brief surface visits at feeding.
• Week 4+: Near-normal if no breaches.

What If You Can't Net?

• Fishing line grid (12" spacing, 12" above water) — deters herons, less visible.
• Decoy + relocation every 2 days — marginal, short-term.
• Accept limited viewing — fish come out only when safe.

Your fish aren't sick. They're surviving. Give them a fortress, not a tonic.