Copyright 2013 James Marsh
Hatches and Trout Flies for Big Flat Brook River New Jersey
This little freestone stream provides a huge diversity of aquatic insects due to its very good
water chemistry and varied types of water.

As with most other trout streams, Blue-winged Olives are among the most important insects in
the stream.  More than one species of these little mayflies will start hatching as early as the
middle of February and hatch until the middle of April. There’s another hatch (Easter Blue
Winged Olives) that occurs from about the middle of May until the first of June. Another
Finally, the last BWO hatch occurs from the middle of August through the month of September.

Around the first or second week in April, the Quill Gordons will hatch. It’s a rather short hatch
lasting only about two or three weeks. At about the same time the Quill Gordons show come
off, the little Blue Quills will start to hatch. The hatch tends to last for about a month.

From the middle of April until about the middle of May, the Hendrickson hatch occurs on the
Big Flat Brook River. You will find them in the more moderate sections of the stream.

From the last of May until about the middle of June you will find hatches of Eastern Pale
Evening Duns (
invaria species) occurring. Before the hatch ends, their little sisters or
Sulphurs (
dorthea species) will start hatching and last until the middle of July.

March Browns hatch from about the first of May for most of the month. They are usually found
in the faster to moderate sections of the stream. Another clinger mayfly, the Light Cahill, will
hatch starting about the last week of May and last throughout the month of June. Slate Drakes
hatch over a long period of time, but usually irregularly. They first show up about the first of
June and hatch off and on until the middle of September.  

Yellow Drakes hatch in the slower sections of the stream from about the middle of June until
the middle of July. The little Trico mayflies start hatching about the middle of June and last
through the month of July. You will find both the Yellow Drakes and the Tricos in the slower
sections of the stream.

Caddisflies are also present in good numbers on the Big Flat Brook River. The first hatch of
significance is the Little Black Caddis, or American Grannoms. Some of these are called Apple
Caddis, named for their apple green bodies. They start hatching about the third week of April
and last until near the end of May. Dark Blue Sedges are very plentiful and start hatching
near the end of April. This hatch can last into the first of the month of July. The most plentiful
caddisflies  are the Cinnamon Caddis. Several species of them hatch from about the last week
of May all the way through most of the month of September. Green Sedges hatch from about
the first of June through August. Their larvae, called Green Rock Worms, are available for
trout to eat year-round. Imitations of them should produce just about anytime.

Midges hatch throughout the year. They become most important when there isn’t anything
else hatching. Imitations of their larvae, pupae and of the adults will produce.  A Griffith’s Gnat
is the top midge dry during hatches of these tiny flies. Also, don’t overlook streamers. The Big
Flat Brook River has plenty of minnows, baitfish and sculpin. Streamers are usually most
effective under low light conditions or when the water is slightly off color from heavy rain.

There are a lot of aquatic insects that hatch in this fine little freestone stream. We have
“Perfect Fly” imitations of all of them. They are not only the most realistic flies you can
purchase, they are the most effective at catching trout. If you haven’t done so already, please
give them a try.
Big Flat Brook River
New Jersey
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Photo Courtesy of Dennis McCarthy
Options For Selecting Flies:
1. Email us with the dates you will be
fishing this stream and we will send
you a list of our fly suggestions. Please
allow up to 24 hours for a response.

2. Call us 800-594-4726 and we will
help you decide which flies you need.

3. Call or email us with a budget for
flies and we will select them and get
them to you in time for your trip.

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over $50 are shipped Priority Mail.