We may not make pickling brine on the Sabbath, but one may make salt water and dip his bread in it, or add it to cooked food. Said R’ Yose: But is this not pickling brine whether it is a large or a small quantity? [Rather] these are the permissible [ways to make] salt water: One first adds oil to the water or to the salt.

The eight sheratzim mentioned in the Torah, one who traps them and one who bruises them is liable. But other vermin and crawling things, one who bruises them is exempt; one who traps them because he needs them is liable, if he does not need them, he is exempt. Beasts and birds that are in one’s domain, one who traps them is exempt, but one who bruises them is liable.