Apex domains cannot have CNAME records.
Question and response
Question
dig fishgate.co.za. NS
Answer
fishgate.co.za. 2 NS fish.ns.cloudflare.com.
fishgate.co.za. 2 NS trey.ns.cloudflare.com.
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0