No tools. Its an old scottish tradition - kinda like throwing rocks and big poles. Been around thousands of years, maybe millions. I remember when I was barely 3 and my dad threw me into the moat; 'Bring home dinner or F&(#k off!' he said, lovingly.
Its quite different tickling a trout or grabbing a salmon out of a river than to throw a punch at one whilst submerged or even poke a spear at one... Hence the elastic.
punch would be too slow, the fish would sense the movement through its lateral line and be gone before You extended through the target.