Mangroves

Found some info online, so it may help you to ID your spotting species.

Worldwide there are about 65 species of mangroves belonging to 20 families. Around 35 mangrove species and three hybrids are known to occur in Queensland, of which eight species live in Moreton Bay Marine Park. Many areas in the marine park provide ideal habitat for mangroves, because they are sheltered by the off-shore islands. There are approximately 140 square kilometres of mangroves in the marine park, with the largest communities found in Pumicestone Passage and the Southern Bay Islands, south of Jacobs Well.

In Moreton Bay Marine Park, the Grey mangrove, Avicennia marina, dominates. River mangrove, Aegiceras corniculatum, is common along river banks, while Black mangrove, Lumnitzera racemosa, is at its southern limit in Moreton Bay.