 Fishery alcohols are structures which have the characteristic hydroxyl group, so the OH group is present again, but this time the carbon to which the hydroxyl group is attached is also attached to one, two, three other carbons. So you can see that the OH group is actually kind of sitting in the middle of this little nest of carbon atoms, so that that carbon to which the OH group is attached is not actually attached to any hydrogens at all, all three of the other bonds available for that carbon are all attached to other carbons.