Order Siluriformes Family Plotosidae(Eeltail catfishes). Estuary cobbler Cnidoglanis macrocephalus(Valenciennes, 1840). Max length : 91.0 cm SL max. published weight: 2.5 kg Dorsal spines(total): 1; Dorsal soft rays(total): 105-134; Anal spines: 0; Anal soft rays: 95 - 112; Vertebrae: 77 – 78
Distribution; Indo-Pacific:/endemic to Australia. General; The only species of the genus Cnidoglanis. An inshore marine species which lives in shallow bays and sandy inlets near river mouths. Found most frequently over sand, rocks and weeds in clear to turbid waters. By day, cobblers are most often found in holes and on ledges in banks. The dorsal and pectoral fins have sharp, venomous spines that can inflict painful wounds. Treatment of injuries by submersion of the wound in hot water is suggested though the role of heat in denaturation of toxins is debated. However, despite this study, hot water immersion is still the recommended first aid treatment for envenomation.
They are opportunistic feeders, primarily feeding at night. Food consists of bivalve and univalve mollusks, crustaceans(small prawns and amphipods), polychaete worms, algae and organic debris. Juveniles eat more crustaceans, often from among drifting macrophytic algae. Adults feed mainly on mollusks and polychaetes. They are prey to birds such as cormorants and pelicans. Males guard the eggs between their pelvic fins for an unknown period in the nest which the male have constructed. The drift weeds found in inshore marine waters, protected inshore marine environments and estuaries act as nursery areas. Cobbler enter these areas during their first year of life and often remain there for long periods.
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