There are at least 400 different species of Gyrodactylus skin flukes found world wide, and I would imagine the particular species found in Turkey may have a slightly different appearance than the typical species posted by photographers in the US.
To me the photos you posted are as Tom said, skin flukes.
You may have had only 1 larval individual or a few eggs on a fish months ago, and it it has taken until this point to notice that they have been reproducing, and are at an epidemic population.