Articles Blog

Could sub-tropical reef and fish one day inhabit Sydney’s waters? 🐠

Could sub-tropical reef and fish one day inhabit Sydney’s waters? 🐠


The question of can Sydney all of a sudden
develop a sub-tropical reef, I would’ve rolled my eyes at that five years ago, but
with what I’ve seen in the last few years suggests to me yeah, Sydney could have a reef
in future. In the last few years, we’ve been quite
excited to see a proliferation of a sub-tropical coral. It’s a pocillopora coral, which is a branching
coral, and it’s attracted to it, a new suite of tropical species of fish we haven’t seen
here. A key thing we’re looking for is the establishment
of these fish – can they survive the winter and grow up to be adult and have babies, and really establish themselves. We’ve seen over 100 species arriving here,
and probably five or six of them are the key ones so far that have managed to last to the
next year. We’ve established that the main reason – no
surprise here – is the water temperature. If the temperature gets above 18 degrees Celsius
in the winter and stays there, the fish tend to survive. What we’ve been able to plot up is a change
since the 1920s of about one and a half degrees Celsius in the inter water temperature in
the Sydney region – so there’s a steady rise. The stability of the ocean has always been
taken for granted. Just in the last few years we’ve been looking,
we’ve seen massive changes offshore and inshore in terms of the tropical arrivals
and if that trend continues, we might see quite a change.

2 thoughts on “Could sub-tropical reef and fish one day inhabit Sydney’s waters? 🐠”

Leave a Reply

Your email address will not be published. Required fields are marked *