I use a 70cm Medi Sten 11 with a Tomba slider kit when hunting Ocean trout very close to the shore during night. The gun shoots right through the touts at distances up to more than 3 meter - even with a low pressure in the gun. It's shoots silent and precise and have very little recoil.
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Jégwan
But I hunt in rivers and lakes with a visibility of 2-3 meters.
And long gun will get in the way.
Fish can be found and 25-30 kg and more. And need a strong cannon.