Which specific fins house the spines associated with venom glands on a scorpion fish?

Dorsal, anal, and pelvic fins.

The biological structure responsible for delivering the scorpion fish's toxin is located within specialized glands connected to its spines. These venom-bearing spines are not randomly distributed across the body but are concentrated in specific fins. Specifically, the venom glands are associated with the spines found on the dorsal fin (the top ridge), the anal fin (the underside rear), and the pelvic fins (the lower pair near the front). Understanding this precise location dictates the necessary precautions during field dressing, emphasizing the need to remove these areas entirely before handling the edible muscle tissue.