There isn't a definite answer as I don't know what you and your boys have. But, so-called duck itch ( or swimmers itch) can occur in both salt and fresh water and is usually associated with migratory water fowl. Your rashes certainly could be duck itch.The rash can have many forms but is usually on the exposed areas.
Seabathers itch occurs only in salt water, the organism is different and is on the covered parts of the body. But the water up here is too cold and in the US this is usually seen mainly in Forida.
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