Geomancer has the highest dagger skill of any of the jobs on this, and the rest of them are D or E.
Further still, the Fragmentation property on Shark Bite isn't going to help or add anything useful to any of these jobs, because they all have a Fragmentation weaponskill or possibility on their primary weapons / are all on Maxentius and can do Thicc Black Halos that have Frag property.
I can't imagine the scenario where you'd want SMN to Shark Bite.
Further still, unlike the other Beryllium/Hepatizon weapons that grant the level 65 OG capstone pre-75 Era highest weapon skills to jobs, this one is sporting a mere +228 skill vs. +242 skill.
Also think it's weird that the Trial of Magians: Defense Down/Atk down/mdef down etc. weapons cap out at +16. Why not just 20? What gives yo?