When is the Cantaria Beetle most available to trout?

November–March, typically 11:00–18:00. It picks up from about 13°C, peaks around 18°C and tails off by 25°C.

What flies imitate the Cantaria Beetle?

Foam Beetle, Chernobyl Ant, Green Beetle, Fat Albert, typically on a #4–1/0 hook.

How big is the Cantaria Beetle?

Adult stage: 25–90mm. That matches a #4–1/0 hook.

Terrestrial · Terrestrial

Cantaria Beetle

Chiasognathus grantii

Size

25–90mm

Hook size

#4–1/0

Hatch window

Season November–MarchPeak time 11:00–18:00

Water temperature

18° peak

13°25°

How fish feed on it

Nothing about a beetle or an ant belongs in the water, which is rather the point — once it's in, it isn't getting out, and a trout that's spent all summer learning this doesn't need convincing twice. The takes tend to be confident and unhurried, especially along undercut banks and under overhanging branches where windfall has been landing for as long as the tree's been there.

Flies that imitate this

Foam Beetle

Chernobyl Ant

Green Beetle

Fat Albert

Ecology

Rivers & stillwaterSpate riversFreestone riversLowland rivers

Where you'll find this

PatagoniaPresent

Present throughout

Identification

Chiasognathus grantii is a species of stag beetle found in Argentina and Chile. It is known as Darwin's beetle , Grant's stag beetle , or the Chilean stag beetle .