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Location: Narragansett Bay
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Re: Catalina "smooth" gel coat has a pebble grain texture. Is this normal?
I'd find it surprising, if a single wash with bleach did anything noticeably destructive. Many use it to recover from a mold infestation. However, common advice is to not use bleach repeatedly. It's a harsh chemical, which will ultimately dull the gelcoat and I wouldn't be surprised if it could alter the pigment in the gelcoat over time. If it did the later, it's permanent, I'm afraid.
If you determine is was not painted, maybe it's some sort of tanic staining, which is more likely if around the waterline. Oxalic acid or On-Off should take that off fairly easily. Wax it up well afterward, if this works, as the old gel coat needs to be sealed to deter it from recurring.
If still a problem, you may want to resort to a wet sanding, compounding, buffing regimen to see if you can restore the flat portions of gel coat. I know of no way to effectively restore permanently damaged non-skid, other than grinding it down and re-applying a replacement. It would have to be very, very, very bad for me to even consider doing that.
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In the harsh marine environment, something is always in need of repair. Margaritas fix everything.