Prepare the whitebait: Start by rinsing the whitebait under cold water to remove any impurities. Pat them dry with a paper towel.
Season the whitebait: With salt and pepper.
Coat the whitebait: In a shallow dish pour in the flour and toss the dried whitebait until they are evenly coated. Shake off any excess flour.
Heat the oil: Pour vegetable oil into a deep frying pan until it's about 1-2 inches deep. Heat the oil over medium-high heat until it reaches around 180°C (350°F). You can test if the oil is ready by dropping a small piece of bread into the oil—if it sizzles and turns golden within a few seconds, the oil is at the right temperature.
Fry the whitebait: Carefully add the coated whitebait to the hot oil, being mindful not to overcrowd the pan. Fry in batches if necessary. Cook for 2-3 minutes, turning occasionally, until the fish are golden and crispy.
Drain and serve: Using a slotted spoon, remove the whitebait from the oil and drain them on a plate lined with paper towels. Serve immediately with a sprinkle of sea salt, lemon wedges and fresh parsley.