Flathead (fish)

Flathead are a group of fish known for their distinctively flat heads. They belong to the family Platycephalidae. These fish are found across the Indo-Pacific region. Many species live in estuaries and the open ocean. They are very common around the coasts of Australia. People often catch them for food or for sport fishing.

The physical shape of a flathead is essential to how it lives. These fish are dorsally compressed. This means their bodies are wide but very low in height. Their eyes are located on the top of their flattened heads. This position provides excellent binocular vision. This type of vision allows them to see prey swimming directly above them. Their body structure is somewhat similar to a flounder. However, flathead are more elongated and have a vertical tail. They also possess a large, wide, and symmetrical mouth.

A flathead uses its unique anatomy to hunt effectively. The fish can change its body color to match its background. This allows the flathead to hide in sand or mud. They stay buried so that only their eyes are visible. When small fish or prawns drift overhead, the flathead strikes. It explodes upwards and outwards to capture the prey. The fish uses a combination of ram and suction feeding. This dual method improves their chances of a successful catch.

While they are effective hunters, flathead have defensive features. They possess two short spikes on each side of their heads. There are also spikes located on the top of their heads. These spikes contain venom. The venom is not fatal to humans. It can cause pain and infection for about two days. Some anglers believe a specific remedy for the sting. They suggest rubbing the slime from the fish's belly onto the wound. This slime comes from a particular gland in the belly of the fish.

Different species of flathead inhabit different environments. The dusky flathead, or Platycephalus fuscus, is the largest species. These fish are found in estuaries and coastal bays. Their range extends from Cairns in Queensland to the Gippsland Lakes in Victoria. They live over sand, mud, gravel, and seagrass. They can inhabit estuarine waters up to the tidal limit.

Other species, known as oceanic flathead, live further offshore. This group includes the sand flathead, tiger flathead, and bar-tailed flathead. They usually frequent sandy zones near or between coastal reefs. However, some species adapt to different areas. For example, the bar-tailed flathead lives in many estuarine environments. One such location is the Swan and Canning River System in Perth.

Flathead are highly significant to human industries and recreation. Fishermen catch various species using baits and artificial lures. While they can be caught all year, they are most common in summer. Saltwater estuaries on Australia's east coast are popular for recreational fishing. The Dusky Flathead is a common target in these areas. In New South Wales, there is also a substantial commercial catch. Many species are used widely as food throughout Australia.

Despite their importance, some species face environmental challenges. The sand flathead, or Platycephalus bassensis, has faced difficulties. This species was classified as depleted due to overfishing. This shows how human activity can impact fish populations. Understanding the different habitats and behaviors of flathead helps us manage these resources. From the sandy reefs of the ocean to the tidal limits of estuaries, these fish play a major role in their ecosystems.