Like a leviathan between his legs.

Oh my god.

Just like mares to blabber about a guys stick
Or dragons tastes in diamonds
motion of the ocean
The sees between the knees
Holy mackerel
DISCORD! Bed now!
I'm so alone
Crab Cake?

"and the volume! Other seapony offerings look like a lot because it spreads out, but this guy...."

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Hey, if it wriggle then who would judge? 😁

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For the most part this is true, though fresh fish does still have a bit of an oily scent to it. It's not really unpleasant, but it's certainly distinct. But yeah, the whole 'stinky fish' smell comes from them aging/dying, you're correct.

It occurs that we haven't noticed if she's been described with a transformation pearl shard, so she must be a true seapony and not a transformed 'griff?

This is accurate. and she gets into it a bit more in Chapter 3. I guess I liked the idea of a fish-pony experiencing many assets of life above the waves for the first time, but still through the lens of a species who considers her home in the water.