Fish kills almost always happen before dawn: once photosynthesis stops, DO falls through the night and hits its daily low between 2 and 5 a.m. General industry reference lines: optimal ≥ 5 mg/L, caution ≤ 3 mg/L. Tilapia and carp tolerate lower oxygen (danger around 1–1.5 mg/L) — but tolerating it is not the same as being fine.
1. Muggy, overcast, before or after a storm. Low pressure and weak sunlight mean less oxygen produced while consumption stays high — the most dangerous days of the year.
2. Between 2 and 5 a.m. The daily minimum. Experienced farmers can spot fish gasping, but that is a late-stage signal — by the time it is visible, DO is often already below 2 mg/L.
3. Peak feeding periods. Uneaten feed and waste decompose and consume oxygen, compounding the nocturnal drop.
| Scale | Recommended setup | Notes |
|---|---|---|
| 1 fish pond | 1 × DO sensor + 1 × 4-channel controller | Controls 4 aerators, threshold-based switching + low-DO alerts |
| Multiple ponds | Per-pond setup, one shared account | Single overview, alerts grouped per pond, historical curves |
| Polyculture ponds | Set thresholds to the most sensitive species | If shrimp or crab are stocked, hold 5 mg/L — not the carp standard |
Aerator count and controller channels depend on aerators per pond and motor power — confirmed after a site survey.
Control logic sits on the pond-side controller, not in the cloud. With 4G down, the controller still switches aerators against the DO threshold and back-fills data when the link returns. The app shows whether you are on cloud control or running locally.
For a remote pond, this is what decides whether the system can genuinely cover the night shift for you.
1. Survey ponds and aerators · 2. Pilot one pond · 3. Verify runtime data over one production cycle · 4. Scale once results are confirmed.
Pilot first, then scale — controllable budget, verifiable results.
No. Aeration switches automatically below the threshold and alerts go to your phone. The system is a safety net, not a replacement for your judgement.
Q: Tilapia and carp tolerate low oxygen — can I skip it?Tolerance just means they die later. In polyculture, set the line to the most sensitive species.
Q: How many ponds at once?Multiple ponds can be grouped under one account, depending on the service tier.
Tell us your pond count, aerator count and current monitoring setup. We reply within 1 business day with equipment sizing and an indicative budget.
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