gradle custom-task always run, even when not called (even indirectly)

Question

The issue :

All my custom task in my gradle project are always launch, even When I don't call them./don't depend them

The context:

I adding multiple custom task to my project

    this.tasks.add(task(MyTask(type: Copy) {
        dependsOn "publish"
        println "MyTask"
    }))

My issue is that all my custom task are always launched (even when I do just a clean !)

    >gradle clean 
     ...
     log: MyTask
     ...

I don't have a dependsOn MyTask hidden anywhere. I have the same issue with task who don't depend of anything and are not depended by anything .My IDE put the MyTask in the category "other".

I've use a taskTree plugin, who don't reveal anything expect:

  > gradle clean tasktree 
     ...
     log: MyTask
     ...
     "no mention of MyTask in the tree, but it's launched anyway"

and also

  >gradle clean MyTask tasktree
     ...
     log: MyTask
     ...
     :myProject:MyTask
     \--- :myProject:publish

How can I forbid the launch of MyTask when I don't do publish?