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Historic monitoring evidence · Environment Agency

Colney Heath

Hertfordshire and North London · survey site

This page records ecological survey evidence. It is not proof of current fish presence, abundance, fishing quality, access, permission or safety at this location.

3survey events
27 Mar 2013first recorded survey
16 Apr 2026latest recorded survey
6observed taxa shown

Observed taxa

What monitoring recorded here

Taxa are ordered by latest survey date. Counts and records reflect monitoring events, not an angling forecast.

Bullhead

Cottus gobio
First record
27 Mar 2013
Latest record
16 Apr 2026
Survey events
3

Chub

Leuciscus cephalus
First record
27 Mar 2013
Latest record
16 Apr 2026
Survey events
2

10-spined stickleback

Pungitius pungitius
First record
16 Apr 2026
Latest record
16 Apr 2026
Survey events
1

Minnow

Phoxinus phoxinus
First record
16 Apr 2026
Latest record
16 Apr 2026
Survey events
1

Pike

Esox lucius
First record
27 Mar 2013
Latest record
2 Apr 2015
Survey events
2

3-spined stickleback

Gasterosteus aculeatus
First record
2 Apr 2015
Latest record
2 Apr 2015
Survey events
1

Rules and access

Check before you travel.

Environment Agency ecology records do not carry fishing-rights boundaries or live restrictions. Confirm the fishery owner, permission, local byelaws, seasonal rules, safety notices and current conditions before setting out.

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Provenance

Source, licence and boundary

Open the official dataset