Unakka Aiyla is the Malayalam, term for dried Mackarel/Mackerel (fish), one of the many dried varieties of fish available in Kerala, India.
Aiyla is the Malayalam word for Mackarel/Mackerel. Unakkameen is the generic term for "dried fish" in Malayalam, the language of the state of Kerala
In Tamil, dried fish is called Karuvadu.
The picture below is fried Unakka Aiyla in Coconut Oil to be serve for dinner with steamed rice and Curry.