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Water Net Algae
Hydrodictyon reticulatum
Plantae›Chlorophyta›Chlorophyceae›Sphaeropleales›Hydrodictyaceae
📍 Worldwide in nutrient-rich ponds and slow rivers
Remarkable bright green net-like colonies — a tessellated honeycomb of cells visible to the naked eye. Beautiful under a microscope but a serious nuisance in garden ponds. Thrives in warm, nutrient-rich water. Manual removal is the primary method as few animals eat it effectively.
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Quick Facts
- role
- nuisance — ponds
- cause
- high phosphate, warm stagnant water
- control
- manual removal, water change, UV steriliser
Water it likes
- ph
- 6.5–8.0
- hardness
- 2–15 dGH
- temperature
- 59–77°F (15–25°C)
Legality
No state or federal restrictions on record for this species.
Not legal advice, and possibly incomplete or out of date. Rules vary by state and locality and change over time — always confirm the current regulations with your state wildlife or agriculture agency before buying, keeping, or shipping this species.