At least 800 migrants have arrived in the Canaries since Thursday
The Spanish Interior Ministry says the immigrants, mostly young men from Gambia, Guinea and Senegal, arrived in five boats.
Last year, more than 30,000 illegal immigrants landed on the islands.
In recent months, the number making the journey from Africa has fallen sharply compared to the same time last year.
Lack of patrols
The recent increase in the numbers making it to the Canaries has been attributed to calm seas, warm weather and the fact the European Union's external borders agency Frontex is not patrolling between the islands and Africa's west coast.
Two of the boats were carrying 103 people each, Spanish interior ministry spokeswoman Candelaria Cedallos told the Associated Press.
The migrants included 30 children, she said.Passengers on one of the vessels told the AFP news agency they had travelled for four or five days and had not eaten anything for the last two days.