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The pennant coralfish is a small-sized fish that can reach a maximum length of 25 cm. [5] [6] However, the average size generally observed in the nature oscillates around 15 cm. [7] Its body is compressed laterally, the first rays of its dorsal fin stretch in a long white filament. The background color of its body is white with two large black ...
Though the one-lined pencilfish is a small fish, with adults not reaching more than 7 cm in length, it is nevertheless one of the largest species of Nannostomus. [8] It is a long slender species with a small terminal mouth, and an adipose fin. [6] It has one black longitudinal stripe that runs the length of the body and onto the caudal fin.
Pseudanthias hawaiiensis, the Hawaiian longfin anthias, is a small colorful species of fish in the subfamily Anthiinae. It is often treated as a subspecies of P. ventralis, [2] but some authorities prefer to treat them as separate species. [3] It is endemic to reefs at depths of 26–219 m (85–719 ft) in Hawaii and the Johnston Atoll. [3]
The anal fin has two spines followed by 15 or 16 soft rays, while the pectoral fin is long and curved. The skin of the fish appears scaleless, but has minute, embedded scales scattered on the body. [6] The lateral line has a strong and moderately long arch dorsally, with its posterior section having 12 to 30 scutes. [5]
The anal and pelvic fins are lighter and the caudal fin is dusky with 1 or 2 light-colored bars. The dorsal fins are continuous with the first dorsal fin being marked with black spots close to the tips of the rearmost 3 spines and a white band long its base, while the second dorsal fin is dusky with a number of diagonal white to yellowish bands ...
P. notatus has wide pectoral fins and a narrow but rounded tail fin. [3] There are four lateral lines on the head and sides of the body. [2] Adult plainfin midshipman. It has 33-38 soft rays in the long second dorsal fin, 30-35 anal rays, and 17 - 20 pectoral rays. [2] The length of the fish varies from female to males.
The longfin trevally is a predatory fish, known to take a variety of small fishes, cephalopods including squid, and crustaceans such as crabs and mantis shrimp. The species' long gill rakers also help to filter minute organisms from the seawater, adding to the fish's diet. [12] Longfin trevallies reach sexual maturity at 21 to 22 cm in length.
The pelvic fins are extremely reduced and are not used in locomotion. The dorsal fin is absent. The pectoral fins of the African brown knifefish are lengthy and designed to give the animal precise control as it swims. They are often employed in a windmilling motion, in conjunction with the caudal/anal fin, as the fish retreats into its lair.