hey Conner, yeah the otolith stuff is pretty crazy. i would say, however, that i WISH they were 1/2" across! these otoliths are a good amount smaller...i haven't dealt with SW fish otos, but i do know the shapes and sizes are quite variable. trout/salmon are a major pain because the structures are tiny for even large fish.
i was also extracting branchiostegal rays, which we also used for age comparison. i haven't messed with giant grenadiers, but i'd definitely be willing to try as fish smells really don't phase me any more...it's more the frustration if the oto goes into the brain case!!! (as i am sure you know

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--solomon