MENNENI Group — Nurturing Nature for a Better Tomorrow

Pond Water Colour Analysis: Diagnosing Algal Blooms & Plankton Health

What does pond water color mean? Decode dark brown, pea-soup green, clear, or milky water in fish and shrimp ponds and fix plankton imbalance.

Visible Symptoms

Water turns bright pea-soup green (cyanobacteria), dark brownish-red (dinoflagellate bloom), clear transparent (no bloom), or muddy clay brown.

Primary Causes

  • Clear water: Lack of nitrogen/phosphorus or high water hardness preventing plankton germination.
  • Pea-soup emerald green: Blue-green algae (Microcystis/Oscillatoria) dominance due to low N:P ratio.
  • Reddish-brown / rust: Dinoflagellate or diatom overbloom prone to sudden nocturnal crashes.

MENNENI Products

Frequently Asked Questions

What is the ideal water transparency in fish and shrimp ponds?

Maintain Secchi disk visibility between 25 and 35 cm with a rich golden-brown (diatom) or light green hue.