For snails I use a micromanaged fleet. They are quite doable even in early, low tech, game, the kaltors are more dangerous, potentially. With high tech fleet, you just kill them...
Take the fastest and somewhat expendable ship and approach carefully, the others a bit further behind. Make it trigger and run ahead of it. The snail will chase this ship, leaving the rest to kill it with no harm to themselves. The shooters can be on auto, and I maneuver the "kiter" in circles around them or something. Just be sure not to move too far, or the snail loses interest, and may go for another ship...
It feels like an exploit, though, but I don't like the wildlife much anyways.