Spencer Gulf, in particular a certain section of it north of Whyalla, is a breeding ground of Australian Giant Cuttlefish. They are a favorite food of local dolphins, who have developed sophisticated techniques for safely eating these creatures. The upper Spencer Gulf is also known for its snapper fishing. The area around the gulf, consisting of the Eyre and Yorke Peninsulas, is the Eyre Yorke Block bioregion which was originally wooded shrubland but has now mainly been cleared for agriculture.
Important Bird Area :
The Spencer Gulf Important Bird Area lies along the north-eastern coast of the Gulf; it comprises a 460 km2 strip of coastal land consisting mainly of intertidal mudflats, mangroves and salt marshes. It was identified as an Important Bird Area (IBA) by BirdLife International because of its importance for the conservation of waders, or shorebirds.