Yes, I was sure about PIAUÍ as I took the photo! But PIAUÍ's sister floating crane in the Manobrasso fleet is/was PARÂ (IMO 7606231)
see http://manobrasso.com.br/equipamentos/cabreas-2/
Both in action on video: http://manobrasso.com.br/videos/

I had assumed that the island where these Manobrasso vessels are all morred was their "parking lot", rather than a scrapyard.

One of them is definitely PIAUI/MANOBRASSO 4 (http://www.shipspotting.com/gallery/photo.php?lid=1558743)
http://www.shipspotting.com/gallery/photo.php?lid=1272964 mentions a some CASTELO BRANCO - is the one that looks like PIAUI? The lattice boom crane is one of those 100t series built by Ganz Danubius, Budapest, Hungary - one of them is in my hometown as well.

The big double-boom floating crane is MANOBRASSO V/MANOBRASSO 5 - 1500 tonnes.
Manobrasso Serviços Marítimos, Niterói RJ
No other details. It's been there for three years at least.
Amongst the jib cranes is probably PIAUI/MANOBRASSO 4 (IMO 7606229)

Pretty sure that the blue 'coaster' is the Brazilian dredger "Natal" built 1971 by Appledore Shipbuilders.

http://www.shipspotting.com/gallery/photo.php?lid=1173372

Brgds
Phil

Do you know the name of the small blue coaster Edson? She looks like a British design, maybe Hancocks/

Including that floating crane, judging from the aft frame work condition ?