Mix up some fresh fixer and put 1/2 the sheet in for a couple of minutes,it looks like not enough washing
I used to use a yankee tank for washing and was caught out several time with the fixed becoming contaminated
hence the spots.
if you are developing on a reel the washing needs to be vigorous 'process of elimination
Now to the good part your print a real strong image I would love to see the top of the rock with minimal