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The pelvic fin is 6–12 in (15–30 cm) anterior to the tail fin. The gafftopsail catfish has maxillary barbels and one pair of barbels on the chin. It resembles the hardhead catfish, but its dorsal spine has a distinctive fleshy extension (like the fore-and-aft topsail of a ship).
Dorsal fin of a shark. A dorsal fin is a fin located on the back of most marine and freshwater vertebrates within various taxa of the animal kingdom.Many species of animals possessing dorsal fins are not particularly closely related to each other, though through convergent evolution they have independently evolved external superficial fish-like body plans adapted to their marine environments ...
These include a noticeably larger body, a more lyre-like tail and most decisively, the extended dorsal fins that have more rays than those of Corydoras [11] Corydoras have 7–10 rays on their dorsal fins, while Brochis have 10–18. [12] Brochis are very large for their family, as all three species can exceed 8 cm (3.1 in) in length.
The first dorsal fin has a blunt apex and is positioned over the latter half of the pelvic fin bases. The second dorsal fin is nearly as large as the first and similar in shape, and positioned over the latter half of the anal fin base. The large, broad pectoral fins have rounded corners. The pelvic and anal fins are low and angular. [8]
The dorsal fin is located far forward, close to the head, and is often high and triangular, thus inspiring the common name. The anal fin is somewhat lengthy, with 26–46 rays. Usually, they have two pairs of barbels , maxillary barbels and one pair of chin barbels, though adult Mekong giant catfish have only maxillary barbels.
Additionally, there are darker, brown-black speckles along the entire surface of the fish. The brown bullhead has a dorsal fin that bears a spine, [6] a single adipose fin posterior to the dorsal fin, abdominal pelvic fins, and an anal fin with 21 to 24 rays. The tail is only slightly notched, with the dorsal and ventral lobes angling inward.
It is one of four species in the genus Ariopsis. [ 3 ] The common name, hardhead catfish, is derived from the presence of a hard, bony plate extending rearward toward the dorsal fin from a line between the catfish's eyes. [ 4 ] It is an elongated marine catfish that reaches up to 28 in (70 cm) in length and 12 lb (5.5 kg) in weight. [ 5 ]
The first dorsal fin has a rounded tip and is positioned over the aft portion of the pelvic fins. The second dorsal fin is similar in size and shape as the first, and is positioned over the aft portion of the anal fin. The pectoral fins are large and broad. The pelvic fins are distinctive, being large and wide with an evenly rounded margin.