I'm not sure really how it is called exactly. We saw this while doing beach hopping during our last year's vacation in Davao City. There were plenty of them around that particular place. As far as I know it is where they stay during their entire fishing period.
Amazing to see how peaceful and calm the water is behaving that time- allowing fishermen do their thing safely out in the sea. Would you imagine yourself in that house for like a day or two?