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Weight vs. length for channel catfish, where b = 3.2293 and = cm [15] An average adult channel catfish measures at least 12 inches (30 centimeters) long, and weighs between 2 and 4 pounds. The largest specimen on record weighed 58 pounds and was caught in 1964 by an angler in South Carolina. [16]
The typical size of the species is about 1.2–1.6 m (3.9–5.2 ft), and fish more than 2 m (6.6 ft) are rare. However, they are known to exceed 2.5 m (8.2 ft) in length and 100 kg (220 lb) in weight. In July 2009, a catfish weighing 88 kilograms (194 lb) was caught in the River Ebro, Spain, by an 11-year-old British schoolgirl. [54]
The blue catfish (Ictalurus furcatus) is a large species of North American catfish, reaching a length of 65 in (170 cm) and a weight of 143 lb (65 kg). [4] The continent 's largest catfish, it can live to 20 years, with a typical fish being between 25–46 in (64–117 cm) and 30–70 lb (14–32 kg).
Growth chart. The typical length of a mature gafftopsail catfish is about 17 in (43 cm). The largest recorded weight for a gafftopsail catfish is 4.54 kg (10.0 lb) [4] and 69 cm (27 in) in length. [5] A more common weight and length of gafftopsails caught is 1–2 lb (450–910 g) and 12–16 in (30–41 cm).
The maximum total length may possibly exceed 3 m (9.8 ft) with a maximum weight of over 200 kg (440 lb). [13] Such lengths are rare and unproven during the last century, but there is a somewhat credible report from the 19th century of a wels catfish of this size.
Phractocephalus hemioliopterus can reach about 1.8 m (5 ft 11 in) in length, and about 80 kg (180 lb) in weight. [7] However, this is exceptionally rare, and most do not approach this size. They average 3 ft 6 in – 4 ft 6 in; 1.1–1.4 m in length.
The maximum length is 160 cm (5.2 ft) in the blue catfish and the flathead catfish. [5] The bullheads, though, are small catfish which at maturity often weigh less than 0.5 kg (1 lb), while the madtoms (genus Noturus ) are in general much smaller.
The flathead catfish grows to a length of 155 cm (61 in) [8] and may weigh up to 55.79 kg (123.0 lb), [9] making it the second-largest North American catfish (after the blue catfish, Ictalurus furcatus). [9] More commonly, adult length is about 15–45 inches (38–114 cm). [6] Its maximum recorded lifespan is 28 years. [10]