The seal lying on Wainui Beach appeared to have “snot” running from its nose, which Mr Quirk said was nothing to be concerned about.
“It is quite normal for there to be excretions from the eyes and noses of seals, including leopard seals. Snot from its nose doesn't indicate its health.
“They may appear lethargic but are just resting, and can move very quickly when required.”
Mr Quirk also advised people to keep a safe (20 metres) away for their safety and to allow the seal to rest.
It would return to the water when it was ready, he said.
“Keep dogs and small children well away, and always have a lead on hand when walking your dog in case you spot animals such as seals.
“We are aware of the seal and are placing signs around it. Dog control at the council has been notified.”