671. Slaughtering

Shabbos 10:25

Dangerous crawling things like snakes and scorpions may be trapped on Shabbos. This is permitted even when they are not deadly but they simply bite, provided that one's intention in trapping them is to keep them from biting people. The course of action in such a case is to invert a utensil over the creature, cover it with something, or tie it up so that it cannot cause harm.

Shabbos 11:1

One who slaughters an animal on Shabbos is liable. This is not limited to ritual slaughter; anyone who kills a living animal, bird, fish, or reptile, whether by slaughtering it, stabbing it or beating it, is liable. Strangling a living creature is a subordinate labor of slaughtering. Therefore, if a person removed a fish from a bowl of water until it died, he would be liable for strangling it. This could be true even if the fish doesn’t die; if a part of the fish’s body between the fins the size of a sela (a small coin, about an inch) dries out, one is liable because the fish will not be able to survive. If a person inserts his hand into an animal's womb and removes a fetus, he is liable.