In the golden age years he was able to paralyze Superman by inducing fear on him using his telepathy.
However his telepathy is very inconsistent because writers are dumb. But he's been seen in relatively recent comics communicating telepathically and fighting Despero telepathically toe to toe.
As far as control goes, he can control any creature under the sea. Since all life evolved from marine life-forms, he can affect the part of the brain that is still similar to that of marine life-forms and use it to induce paralysis, pain, black-outs, etc.
I don't know how it is now in the DCnU.
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