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While trying to get from Africa to Europe by sea, more than 35 migrants overturned their boat off the coast of Lanzarote on Tuesday.
28 people survived the accident, at least eight drowned.
Four dead were found on Tuesday, and rescue workers recovered four bodies on Wednesday.
More people are still missing.
The refugee boat capsized in the rough seas of the Atlantic shortly before it reached Orzola, a fishing village on the north coast of Lanzarote.
The dangerous sea route from Morocco to the Canary Islands was a much-used refugee route until Spain started controlling the coast more closely in 2006.
After that, the number of escape attempts shrank to a few hundred per year - until the start of the corona crisis.
In many regions of Africa there is a lack of income from tourism, one of the sectors worst hit by the coronavirus pandemic.
This year, more than 17,000 Africans tried desperately to reach the Canary Islands - ten times as many as last year.
The refugees often begin their journey in rickety, overcrowded boats with unreliable engines.
According to the International Organization for Migration, hundreds of them have already died on the dangerous escape route this year.
