Published Apr 23. 2014

Sydney Opera Mouse

A crazy foam construction that looks very little like a mouse and a lot like an opera house

Side view - The body is made from sheet foam
The layers - The layers in the construction are clearly seen here
The Sydney Opera Mouse

The Sydney Opera Mouse is called that because it faintly resembles Danish architect Utzon's famous landmark in Sidney. Constructed with several arcs of foam, it gets the layered look of the shells that form the roofs on the famous opera building in Sydney Harbor.

It's easy to tie

and doesn't require any special types of foam, just ordinary sheet, which can be bought cheaply in any craft or hobby store. You can of course also use closed cell foam for fly tying, but be warned: you will eat through the small and fairly expensive sheets pretty fast. Spare those for mayflies and extended bodies and opt for the cheap toy stuff, which is firmer and perfect for this purpose.

Sydney Opera Mice - Foam sheet is cheap and easy to find, and by stacking pieces of it like this you get some excellent mouse flies
A weird foam mouse

The only hard part

is to cut the foam shapes that form the body. Three pieces will usually do, and if you follow the general outlines that I have sketched here, you will get a decent result. The shape is like the peel of a quartered orange, but with slightly varying length and width. You can cut it a bit narrower in one end and broader in the other, but it doesn't have to be very precise. Foam is soft and forgiving and can be formed and stretched as you tie.
You need a broad short piece, a medium piece and a narrow long piece. The short one should be as the hook shank, the long one just slightly longer. Add to that a large and light streamer hook, a foam or yarn tail, some strong tying thread, and you have the building materials for a foam mouse.

I have made this mouse

in two versions: one with the largest and broadest foam piece on top, and one with the narrowest one on top, and the latter does look most like a mouse - if you can say at all that it looks like a mouse. That's the one you will get if you use the shapes sketched below and tie them in as shown - short and wide first, then medium and then long and narrow.

Foam pieces - Cut three foam pieces about this shape and size in relation to the hook
The blueprint

Sydney Opera Mouse

Pattern type: 
Pike fly
Martin Joergensen
Large straight eye streamer hook 1/0-4/0
Tan 6/0
Foam scrap or yarn
Three pieces of brown, tan or grey foam cut to shape
Pick a hook before cutting the foam pieces.
Cut three foam pieces as shown on the drawing
Use a small foam scrap for the tail
Tie in the tail over the hook bend
Tie in the pieces of foam in reverse order, one at a time, pointing to the rear
Take the thread forward
Bend the top piece of foam forward and tie it down flat
Bend the next piece forward and tie it down with an arc over the first piece
Bend the final piece forward and tie it down, arcing the two other pieces
Whip finish and cut the thread
Varnish the two tie-in spots and the whole hook shank

Fishing the mouse

Fish this pattern on a floating line and a not too long leader. You can use a wire trace if you are fishing for pike, but honestly - save the energy and the hook, and fish something simpler than this for pike. The fly will be trashed very quickly. A Plipper on a tube is a better choice and even easier to tie.
Thanks to the shape and the light weight, the Sydney Opera Mouse will float, but dive with small splashes when you retrieve it. Swung across a stream or fished against the current it will stay under, which is not the way a mouse swims, so fish it upstream or on still water where it can float freely between your strips.
The fly will undoubtedly do fine as a diver in saltwater or as a diving popper when fishing for bass, so there's lots of possibilities to experiment.

Sydney Opera House - The shells clearly visible on this landmark building
The original doesn't look like a mouse either

More on mice



Martin Joergensen's picture


No, this mouse tends to dive if you fish it too fast. A dead drift with a twitch now and then works best. Or you could add a foam lip in the front of the mouse to press it above the surface when it's retrieved.


Does this mouse plane on the top of the water like other mice patterns? It has been my experience that the more the mouse skitters and skips on the surface the more violent and acrobatic the strike.

I like it Martin. I'm heading up to Northern Ontario in mid-July, gives me a new fly to try. Should work for the smallmouth to. It should work around here, probably in a smaller size for the bass and chain pickerel in the local lakes. I'll let you know how it works.

"All things considered, I'd rather be in Philadephia."

Miro Jagger's picture

Very simple and interesting solution. Thanks Martin.

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