In this episode, we catch up with Dr Travis Dutka from La Trobe University, to find out about the amazing discovery of huge bryozoan reefs in Westernport Bay. Bryozoans, a unique type of colonial animal, rarely form such large reefs in such shallow water - these recently discovered reefs are globally special.

Also, we talk to Jill Wheeler, a ranger at Parks Victoria who looks after some of Port Phillip Bay's marine sanctuaries. We find out about efforts to control sea urchins, which are threatening these precious marine exosystems. Parks Victoria is celebrating 20 years of marine parks - you can join in their series of webinars at the Parks Victoria website.

Image: Bryozoan. Photo: John Turnbull/Flickr.