Anxious Arthropods?

Crabs and lobsters, used in UK animal experiments, may get the same protections as vertebrates and certain specified molluscs (octopus and squid), when the proposed animal sentience bill becomes law (https://www.theguardian.com/world/2022/apr/25/crabs--lobsters-may-get-similar-rights-uk-experiments-mammals-sentience-law-welfare). There are difficult calibrations to make in animal protections. 'Sentience' actually implies that the organism has higher-order behaviour and possible self-awareness. A response to pain doesn't really 'cut' it. Most animals will move away from damaging stimuli. Crabs and lobsters are not so very different from other arthropods (prawns, shrimps and insects). If they have a difference, it's their relatively large size. This may result in we humans being more likely to regarded them as 'individuals'. Crabs and lobsters are still, however, often killed for fine dining, by being dropped into boiling water. I'm aware that there are moves to change this practise. I'm uncertain, however, if raising the temperature more slowly and driving out the contained oxygen from their seawater, is any kinder. Live crabs are commonly used as bait by sea anglers. People can also be pretty mean to insect 'pests'. They are paralysed by applications of organophosphate insecticides. I'm all for animal experiments being conducted as humanely as possible. Making a special case for crabs and lobsters seems, however, a trifle unscientific. It's also seems odd that the 'rights' of a species, depend on whether it is being used in an experiment or prepared for the dinner table.