Wash the fish, pat dry, and 'clean' it by rubbing and rinsing with lime juice.
Make 3-4 deep diagonal scores on both sides of each fish, penetrating down to the bone.
In a small bowl, mix the minced garlic, oregano, salt, pepper, and possibly a little lime juice to form a paste.
Rub this paste thoroughly into the entire fish, especially into the scores and the belly cavity. Marinate covered in the refrigerator for at least 20 minutes, ideally 1 hour.
In a large, shallow dish, mix the flour and cornstarch. If desired, you can add a little salt, pepper, and Adobo to the mixture.
Thoroughly coat the fish in the flour mixture, making sure the scores are covered. Gently shake off any excess flour.
In a large, deep skillet or pot, heat the oil to 185 °C (365 °F) (the oil should cover at least half of the fish).
Fry the fish for 5-7 minutes on each side (depending on thickness) until it is golden brown and extra crispy. Always fry a maximum of one fish at a time to prevent the oil temperature from dropping.
Remove the fried fish and place it on paper towels to absorb excess oil.
Serve the fish immediately, drizzled with fresh lime juice. Traditional side dishes are Tostones (fried plantains), a simple salad, and sometimes Yaniqueques (Dominican fried thin flatbreads).