There are two seahorse species commonly seen in places like Chowder Bay, Mosmanm, NSW White’s Seahorse (Hippocampus whitei) and Pot-Bellied Seahorse (Hippocampus abdominalis).
This is one of the largest populations of White’s Seahorses, however, they are an endangered species (the second endangered seahorse species in the world!). The main cause of their population decline is habitat loss, including declines of seagrass, soft corals and sponges.
The seahorses in Chowder Bay can often be found on the swimming nets and the new “Seahorse Hotels”, artificial structures which act as a habitat and attract micro-organisms that the seahorses feed on. - Mitchell Brennan, Aquarlist, SEA LIFE Sydney.
Seahorses are commonly found in Botany Bay - Kurnell and La Perouse. Here are some photos that have inspired illustrations.