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Crabs, no chance I would go for filter feeders here and there aren't that many places suitable for them to grow anyway. Although there are a few rocky areas for sea defences they mostly have limpets on them. I think limpets would be safe to eat but are very chewy and not something you normally eat when you have other choices.
I wonder if you could make a seafood stock from them, but it feels a little wasteful to only use them for that.
Oh, crustaceans, then. I thought "shellfish" referred to molluscs specifically (because of the valves, or "shells"), but I see now that I was mistaken.
Seafood bisque is a fairly high-end item IIRC, so there's no shame there I should think. If the cooked limpets weren't good for anything else, they might also be good for fertiliser in a garden. *shrug*
Not sure if limpets are crustaceans, but yeah anything with a shell I would think is shellfish.
IIRC limpets are not filter feeders, mussels are. So in water that is sometimes polluted they are not as much of a risk while filter feeders are very high risk. Does also depend on the type of pollution though.
I know people eat crabs from the Thames, pretty sure the Solent isn't quite as bad as that for pollution. As for using them as fertiliser, maybe, but isn't protein recommended against usually? Might be ok if it's only a little but to make a stock I would think you need quite a few of them.
Quick edit - Could use limpets as bait though. Otherwise likely most suited as a famine food.
Limpets are indeed molluscs. Crustaceans are like underwater insects, with every single part of their bodies typically covered in thin-ish keratin-based plating. That said, they include some oddballs like barnacles, which build shells more like bivalve molluscs do (clams and such).
You're right about the different feeding methods of limpets and filter-feeders. Limpets are like gastropod molluscs (snails, etc) in that they eat directly from a surface or prey.
Oh, I'd generally thought that most animal material (and of course waste) makes for good fertiliser, but maybe it depends. In truth, I was thinking back about a garden project in which we used a kind of 'fish guts' solution to help grow produce. The plants loved it!
I think the main problem is that it's far more likely to attract things like rats if you are throwing out stuff like that. But it probably also depends on how you compost it.
Right, it would need to be blended up with some water such that it quickly sunk in to the soil, like the fish guts liquid fertiliser.
Ok that might work. Getting a blender for that seems a bit excessive though. Maybe diced finely and then spread out among a bunch of other things though.
That assumes that limpets can even make a stock worth bothering with of course. I think it might be but can't find too much info on them, or many recipes.
Just remembered Atomic Shrimp tried it, back in the website days - https://atomicshrimp.com/post/2010/08/25/Limpets-Another-Try
So generally limpets are going to be tough regardless of what you do to them. Not inedible though. But could work for a nice seafood stock. Perhaps if you got a variety of things you could also collect limpets for stock.