Permission to submit webform only for the author of the node I'm using webform 8.x for a personal project and I'd like to know if it possible to enable only the author of the node to submit the form.

In my project each node is an aquarium, and I am using webform to collect the all the daily data for that specific node ( aquarium ), like temperature, pH, KH ecc.
I was able to create a view related to the node (aquarium) where you can see the data submitted daily for that specific aquarium, but the problem is that everyone can submit the form, while I need only the author of the node to be able to submit the webform.

Can you please give me some ideas? I'm stuck..
You haven't said if this is Drupal 7 or Drupal 8 but this should work for D8

It sounds like each author already has a user account on your website, so you can go to "Settings" on your webform and then click the "Access" tab (.e.g /admin/structure/webform/manage/FORM_MACHINE_NAME/access)

And in there you can restrict the ability to create submissions to a specific user(s) only