New Haven River

Hatch

Date

Early

Late

Blue wing Olive / Blue Dun

16-May

26-Oct

#16 - #24 entire season

Hendrickson

2-May

23-May

Spinners Later - predictable hatch

Sulfurs (P.E.D)

24-May

7-Sep

Heavy and predictable spinners, esp. late may; early June

Grey Fox / March Brown

25-May

3-Jun

Scant; Occasional good spinner fall

Trichos

15-Jul

7-Sep

Duns Early - Spinners late am.

Isonychia

13-Aug

11-Sep

sparse and unpredictable

Ephoron (white fly)

1-Sep

10-Sep

Rare

Caddis

27-Apr

24-Oct

#16 tan in Sept. predictable sporadic early #12 -#16 slate and Brown

Small Stonefly

13-Apr

17-Aug

Tan #10-#12; yellow and green sally #14-#16

Large Stonefly

22-Jun

10-Aug

Nymphs earlier - above Bristol village

Midges

11-Apr

25-Oct

#18 and smaller

Flying ants

21-May

8-Sep

Red Ant Swarms late Aug. / early Sept.; black ant usually mid Aug.

Hoppers

5-Aug

6-Sep

Times seen active in water