After assessing his wound and giving first aid, the Coastguard team transported Alders back to Marsden Cove, to a waiting ambulance.
Alder's whole arm was numb to touch from the poison and throbbing with pain. He got two stitches to seal up the gaping hole and has to get his dressing changed by a nurse.
He has two weeks before he has to be back on the sea and he's hoping to be healed by then.
But he's got no ill feelings towards the stingray. He called the incident "just part of the job" of being a commercial fisherman.
"If you cast a shadow over their eyes it's their natural instinct to flick their barb up," he said
"I don't blame it for what it did ... They are live animals pulled out of the water, they are not going to be very happy."
Alders was just glad he's still here to tell the tale.
"That's the main thing, I didn't lose a limb or anything."