I'm curious if anyone tries this and if so how's it feel?
It should require a bit of patience as you fight the fish and hopefully gives a sense of you ushering the fish over to you.
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As for the modifier pool; you may use these dice to add or subtract from your initial roll. i.e. the fish range is 7-9 and you roll a 5 you may roll 1 or more d4 and add the results to your roll. Be careful! If you go over the range the line snaps and the fish is lost.
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Continue this processes until the fish only has 2d4. If you succeed in rolling between the range the fish is caught!
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If you succeed replace one of the fish dice with a value lower than it. d12->d10->d8->d6->d4.
Always replace the highest die.

If you fail replace the lowest dice with a die a step up. d4->d6->d8->d10-d12.
🧵[5/8]

Fish starts with 2 dice. We'll use d12's for this example. Roll the two dice and note the range (lowest number and highest number)
Roll a d6 (d6 is used for basic rod and line)
Your goal is to roll a number that matches or is in-between the two numbers provided by the fish.
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Reel er' in, nice and steady.
In fly fishing you need to guide the fish in, not pull it. This is because of the weaker line used. So here's how I tackled this.
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Hook the fish.
Roll 1d20 and get within the range noted by the fish (for example between 2-17). This is the same as hooking in standard fishing.
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Let's cast!
Players roll 1d20 and note the result. Roll again and again trying to get a higher result than the previous roll.
For each success add 1d4 to the Players modifier pool.

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I maybe would like a flashlight/infrared vision. Something that improves your sight.
Or extends your ability to breath.
An improvement on staying calm might be handy if fear/stress is important.

I suppose the answer depends on the themes and goals of the game.

I hope you enjoy them.

Fish measurements
With each failure the size of the fish goes up until ultimately it becomes a different (bigger) fish.

So catching that perch with two successes right out of the gate results in a small perch. Fighting it for a while results in a bigger catch.
[5/5]

You roll your dice and the GM rolls the fish dice.
You must meet or beat the fish dice sum.
There is a catch. Fish need X amount of consecutive successes to be caught. They also have Y amount of consecutive failures before they break free.

So a Perch might be 2 successes and 5 failures.
[4/5]

Fight!
Rods and lines are assigned dice. Default is just 1d6. Better rods/lines add more dice. Rods start at d6 and go up to d12. Lines start at nothing and go up to d12.
Fish have some dice noted. The perch from earlier might be 2d4 while a Marlin might be 2d20.
[3/5]

Hook the fish.
Roll a d20.
Fish have a range you must land in to hook them. A perch might be 2-18. A northern might be 5-17
Go under the range and it's like you're too slow to hook it and your bait was eaten. Too high and you pulled too hard, ripping the hook out of the fish.
[3/5]

There are a few key things I want to tackle first and foremost.
1. Hook the fish.
2. Fight the fish as you reel it in.
3. If captured provide weight and length.
[2/5]

DM me for free copies. However, I'll need your email to send it.

I definitely would send a free digital copy to any who ask. I'd send more if the rest of the players want their own copies.