While there has been scientific debate about exactly how fish experience pain, there is strong evidence that demonstrates fish responding to pain and injury, producing measurable stress hormones, changing their behavior after injury, and actively avoiding harmful situations. Most scientists now recognize finfish, cephalopods (octopus, squid, cuttlefish) as sentient animals, while evidence for crustacean sentience (shrimp, crabs, lobsters) is strong enough that several governments now treat them as sentient.