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Fusiform (from Latin fusus ‘spindle’) means having a spindle-like shape that is wide in the middle and tapers at both ends. It is similar to the lemon-shape , but often implies a focal broadening of a structure that continues from one or both ends, such as an aneurysm on a blood vessel .
Clupeidae is a family of clupeiform ray-finned fishes, comprising, for instance, the herrings and sprats.Many members of the family have a body protected with shiny cycloid (very smooth and uniform) scales, a single dorsal fin, and a fusiform body for quick, evasive swimming and pursuit of prey composed of small planktonic animals.
Their food is smaller fish and crustaceans . Typically throughout the species, the maximum size is 1 m (3.3 ft) and the maximum weight 10 kg (22 lb). The body is fusiform (tapering spindle shape) and oval in cross-section; being slightly laterally compressed, and the eyes are large and partially covered with adipose eyelids.
Fish have a variety of different body plans. At the broadest level, their body is divided into the head, trunk, and tail, although the divisions are not always externally visible. The body is often fusiform, a streamlined body plan often found in fast-moving fish. Some species may be filiform (eel-shaped) or vermiform (worm-shaped).
The yellowback fusilier is a small to medium-sized fish which grows to about 40 cm (16 in) long. [5] The mouth is small and terminal and is protusible, being able to be extended forward to swallow food. The body is fusiform or spindle-shaped. The dorsal fin has 10 spines and 14–15 soft rays. The anal fin has three spines and 11 or 12 soft rays.
As fry, this fish is 5 mm (3 ⁄ 16 in) long, and some of the larger eastern blacknose dace can reach slightly over 100 mm (3.9 in). They tend to live for two or three years and grow continuously during this period. [4] They have a fusiform body shape and the mouth is in a subterminal position.
Species within the Etheostomatinae are all small fish, mostly less than 11 centimetres (4.3 in) in length, and their bodies are slightly compressed or fusiform in shape. They have two pterygiophores between the first and second dorsal fins which do not have spines and a reduced swimbladder which may be completely lacking. [2]
It has a triangular head with several bony plates. Its body is an elongated fusiform body with five rows of bony scutes: dorsal with 10–16 beetles (the first is largest), two laterals (32–46 scutes), and two ventral (8–12 scutes) between rows of small bony scutes grains and rarely more large plate.