Catgut Biothread

CAD $4.00

  • One of the best materials for tying killer, super-realistic nymphs.
  • Unique and versatile – a top choice material among world’s most experienced fly tyers.
  • It is opaque, solid-colored when dry and becomes milky translucent and shiny when wet.
  • When submerged in water, it becomes very soft, flexible and stretchable, which makes it super easy to work with.
  • As it soaks in water, its volume also increases, giving a plump appearance to the fly.
  • The most amazing benefit of using this material is the way it looks in water – flies tied with it look extremely authentic, have lifelike texture and super-high shine.
  • The material has been treated to extend its durability under water.
  • To apply, soak the part you want to use in warm water for 3-5 minutes prior to tying. The color will change from opaque to more milky and transparent and the material will be super-flexible and easy to wrap.
  • When the fly dries, the body will go back to its solid-colored state.
  • By using various colored threads underneath it for underbody, different effects can be achieved as the color peaks through the wet material.
  • About 50 cm long (about 20”), comes in four diameters and wide range of colors.
  • Sizes (Diameters) and hook recommendations:
    • Extra Small (0.18mm) – for hooks #16 and #20
    • Small (0.3mm) – for hooks #14 and #16
    • Medium (0.5mm) – for hooks #12 and #14
    • Large (0.7mm) – for hooks #8 and #10
  • Absolutely perfect for making bodies for nymphs and emerger flies.
  • Also a great choice material for making loops on traditional salmon flies (small diameters in particular, XS and S)

See Description tab below for more details on this great product, tying instructions, sizes and more!

Clear
PhotoDetailsPriceQTY
Catgut Biothread - NaturalColor: Natural
Size: Extra Small
SKU: 107-0114XS-01
CAD $4.00

Out of stock

Catgut Biothread - NaturalColor: Natural
Size: Small
SKU: 107-0114SM-01
CAD $4.00

Out of stock

Catgut Biothread - NaturalColor: Natural
Size: Medium
SKU: 107-0114ME-01
CAD $4.00

Out of stock

Catgut Biothread - NaturalColor: Natural
Size: Large
SKU: 107-0114LG-01
CAD $4.00

Out of stock

Catgut Biothread - BrownColor: Brown
Size: Extra Small
SKU: 107-0114XS-02
CAD $4.00

Out of stock

Catgut Biothread - BrownColor: Brown
Size: Small
SKU: 107-0114SM-02
CAD $4.00

Out of stock

Catgut Biothread - BrownColor: Brown
Size: Medium
SKU: 107-0114ME-02
CAD $4.00

Out of stock

Catgut Biothread - BrownColor: Brown
Size: Large
SKU: 107-0114LG-02
CAD $4.00
Catgut Biothread - Cocoa BrownColor: Brown Cocoa
Size: Extra Small
SKU: 107-0114XS-03
CAD $4.00
Catgut Biothread - Cocoa BrownColor: Brown Cocoa
Size: Small
SKU: 107-0114SM-03
CAD $4.00
Catgut Biothread - Cocoa BrownColor: Brown Cocoa
Size: Medium
SKU: 107-0114ME-03
CAD $4.00
Catgut Biothread - Cocoa BrownColor: Brown Cocoa
Size: Large
SKU: 107-0114LG-03
CAD $4.00
Catgut Biothread - Caddis GreenColor: Caddis Green
Size: Extra Small
SKU: 107-0114XS-04
CAD $4.00

Out of stock

Catgut Biothread - Caddis GreenColor: Caddis Green
Size: Small
SKU: 107-0114SM-04
CAD $4.00

Out of stock

Catgut Biothread - Caddis GreenColor: Caddis Green
Size: Medium
SKU: 107-0114ME-04
CAD $4.00

Out of stock

Catgut Biothread - Caddis GreenColor: Caddis Green
Size: Large
SKU: 107-0114LG-04
CAD $4.00

Out of stock

Catgut Biothread - CinnamonColor: Cinnamon
Size: Extra Small
SKU: 107-0114XS-05
CAD $4.00
Catgut Biothread - CinnamonColor: Cinnamon
Size: Small
SKU: 107-0114SM-05
CAD $4.00

Out of stock

Catgut Biothread - CinnamonColor: Cinnamon
Size: Medium
SKU: 107-0114ME-05
CAD $4.00

Out of stock

Catgut Biothread - CinnamonColor: Cinnamon
Size: Large
SKU: 107-0114LG-05
CAD $4.00
Catgut Biothread - Fluo PinkColor: Fluo Pink
Size: Extra Small
SKU: 107-0114XS-06
CAD $4.00
Catgut Biothread - Fluo PinkColor: Fluo Pink
Size: Small
SKU: 107-0114SM-06
CAD $4.00
Catgut Biothread - Fluo PinkColor: Fluo Pink
Size: Medium
SKU: 107-0114ME-06
CAD $4.00
Catgut Biothread - Fluo PinkColor: Fluo Pink
Size: Large
SKU: 107-0114LG-06
CAD $4.00
Catgut Biothread - Fluo YellowColor: Fluo Yellow
Size: Extra Small
SKU: 107-0114XS-07
CAD $4.00
Catgut Biothread - Fluo YellowColor: Fluo Yellow
Size: Small
SKU: 107-0114SM-07
CAD $4.00
Catgut Biothread - Fluo YellowColor: Fluo Yellow
Size: Medium
SKU: 107-0114ME-07
CAD $4.00

Out of stock

Catgut Biothread - Fluo YellowColor: Fluo Yellow
Size: Large
SKU: 107-0114LG-07
CAD $4.00
Catgut Biothread - Green OliveColor: Green Olive
Size: Extra Small
SKU: 107-0114XS-08
CAD $4.00

Out of stock

Catgut Biothread - Green OliveColor: Green Olive
Size: Small
SKU: 107-0114SM-08
CAD $4.00

Out of stock

Catgut Biothread - Green OliveColor: Green Olive
Size: Medium
SKU: 107-0114ME-08
CAD $4.00

Out of stock

Catgut Biothread - Green OliveColor: Green Olive
Size: Large
SKU: 107-0114LG-08
CAD $4.00
Catgut Biothread - OliveColor: Olive
Size: Extra Small
SKU: 107-0114XS-09
CAD $4.00

Out of stock

Catgut Biothread - OliveColor: Olive
Size: Small
SKU: 107-0114SM-09
CAD $4.00

Out of stock

Catgut Biothread - OliveColor: Olive
Size: Medium
SKU: 107-0114ME-09
CAD $4.00

Out of stock

Catgut Biothread - OliveColor: Olive
Size: Large
SKU: 107-0114LG-09
CAD $4.00
Catgut Biothread - Olive BrownColor: Olive Brown
Size: Extra Small
SKU: 107-0114XS-10
CAD $4.00

Out of stock

Catgut Biothread - Olive BrownColor: Olive Brown
Size: Small
SKU: 107-0114SM-10
CAD $4.00

Out of stock

Catgut Biothread - Olive BrownColor: Olive Brown
Size: Medium
SKU: 107-0114ME-10
CAD $4.00

Out of stock

Catgut Biothread - Olive BrownColor: Olive Brown
Size: Large
SKU: 107-0114LG-10
CAD $4.00
Catgut Biothread - OrangeColor: Orange
Size: Extra Small
SKU: 107-0114XS-11
CAD $4.00
Catgut Biothread - OrangeColor: Orange
Size: Small
SKU: 107-0114SM-11
CAD $4.00
Catgut Biothread - OrangeColor: Orange
Size: Medium
SKU: 107-0114ME-11
CAD $4.00
Catgut Biothread - OrangeColor: Orange
Size: Large
SKU: 107-0114LG-11
CAD $4.00
Catgut Biothread - RedColor: Red
Size: Extra Small
SKU: 107-0114XS-12
CAD $4.00
Catgut Biothread - RedColor: Red
Size: Small
SKU: 107-0114SM-12
CAD $4.00
Catgut Biothread - RedColor: Red
Size: Medium
SKU: 107-0114ME-12
CAD $4.00
Catgut Biothread - RedColor: Red
Size: Large
SKU: 107-0114LG-12
CAD $4.00
Catgut Biothread - YellowColor: Yellow
Size: Extra Small
SKU: 107-0114XS-13
CAD $4.00
Catgut Biothread - YellowColor: Yellow
Size: Small
SKU: 107-0114SM-13
CAD $4.00
Catgut Biothread - YellowColor: Yellow
Size: Medium
SKU: 107-0114ME-13
CAD $4.00
Catgut Biothread - YellowColor: Yellow
Size: Large
SKU: 107-0114LG-13
CAD $4.00

Description

Catgut Biothread

Catgut Biothread is one of the best materials for tying extra effective, super-realistic nymphs. Its very unique characteristics and versatility make it a top choice among world’s most experienced fly tyers. This material is opaque, solid-colored when dry and becomes milky translucent and shiny when wet. When submerged in water, it also becomes very soft, flexible and stretchable, which makes it super easy to work with. As it soaks in water, its volume also increases, giving a plump appearance to the fly. The most amazing benefit of using this material is the way it looks in water – flies tied with it look extremely authentic, have lifelike texture and super-high shine. The material has been treated to extend its durability under water.

To apply, soak the part you want to use in warm water for 3-5 minutes prior to tying. The color will change from opaque to more milky and transparent and the material will be super-flexible and easy to wrap. When the fly dries, the body will go back to its solid-colored state. By using various colored threads underneath it for underbody, different effects can be achieved as the color peaks through the wet material. The combinations are really limitless. See below for detailed instructions.

Catgut Biothread is about 50 cm long (about 20”), comes in four diameters and wide range of colors.

Sizes (Diameters) and hook recommendations:

  • Extra Small (0.18mm) – for hooks #16 and #20
  • Small (0.3mm) – for hooks #14 and #16
  • Medium (0.5mm) – for hooks #12 and #14
  • Large (0.7mm) – for hooks #8 and #10

Catgut Biothread is perfect for making bodies for nymphs and emerger flies. It is also a great choice material for making loops on traditional salmon flies (small diameters in particular, XS and S)

How to use Catgut Biothread

Tying a Classic Micro Nymph with Catgut Biothread:

How to tie realistic mayfly - Step 13

with Catgut Biothread

TYING A CLASSIC MICRO NYMPH


Prior to tying, soak the part of Catgut Biothread that you want to use in warm water for 3-5 minutes. The color will change from opaque to more milky and transparent and the material will be super-flexible and easy to wrap. When the fly dries, the body will go back to its solid-colored state.

First Step
Tying the Micro Nymph with Catgut - Step 1
Tying the Micro Nymph with Catgut - Step 2
Tying the Micro Nymph with Catgut - Step 3
Tying the Micro Nymph with Catgut - Step 4
Tying the Micro Nymph with Catgut - Step 5
Tying the Micro Nymph with Catgut - Step 6
Tying the Micro Nymph with Catgut - Final Fly - Dry

Finished Micro Nymph with dry body

Tying the Micro Nymph with Catgut - Final Fly - Getting Wet

Micro Nymph after few seconds of soaking in water

By using various colored threads for underbody, different effects can be achieved as the color peaks through the wet material. The combinations are really limitless.

Tip
Tying the Micro Nymph with Catgut - Final Fly - with Green Underbody thread

Micro Nymph with green underbody thread

Tying the Micro Nymph with Catgut - Final Fly - with Green Underbody Thread - When Wet

Micro Nymph with green underbody thread - soaked

Tying the Micro Nymph with Catgut - Final Fly - with Brown Underbody Thread

Micro Nymph with brown underbody thread

Tying the Micro Nymph with Catgut - Final Fly - with Brown Underbody Thread - When Wet

Micro Nymph with brown underbody thread - soaked

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Video Tutorial – Fly Tying a Catgut Caddis Pupa:

Catgut Caddis Pupa

Catgut Caddis Pupa

Additional information

Weight0.005 kg
Dimensions13 x 7 x 0.3 cm
Manufacturer

Color

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