Phenology planner — 2026

Chain graph Observations

🐛 Aquatic insects 12

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

Chironomid (bloodworm) main emergence ⊕

20 Feb–15 Mar

Phantom midge ⊕

15 Mar–30 Apr

Large dark olive

25 Mar–15 May

Hawthorn fly ⊕

01 May–20 May

Mayfly main hatch ⊕

25 May–15 Jun

Damselfly emergence (mixed spp.) ⊕

25 May–15 Jul

01 Jun–31 Aug

Caddis/sedge peak (mixed spp.)

01 Jun–15 Sep

Caenis 'angler's curse' ⊕

15 Jun–15 Aug

15 Jun–30 Sep

01 Jul–31 Jul

Crane fly / daddy-long-legs ⊕

15 Aug–15 Oct

🐟 Fish behaviour 8

Jan

Feb

Mar

Apr

May

Jun

Jul

Aug

Sep

Oct

Nov

Dec

15 Feb–10 Apr

Perch spawning ⊕

01 Apr–15 May

15 Apr–31 May

15 May–30 Jun

20 May–15 Jul

Tench spawning ⊕

25 May–15 Jul

Adult eel autumn migration

15 Sep–15 Nov

Brown trout spawning ⊕

15 Oct–15 Dec

Legend. Positive indicator Negative indicator (nuisance) Today ⊕ In a phenology chain