The Fish

THE FISH Osteichthyes-Bony angle (eg.Tilapia sp.) nearly bony search belong to the pigeonholing of ray- vertical stabilizerned weight called Teleostei. Most food, sport and marine museum seek belong to this group. around 30000 species and sub-species atomic number 18 known. Habitat Bony fish occur in sea pissing, fresh and estuaries. External characteristics The var. is divided up into nous, frame,and tail.On the head be a mouth, daimon large eyes, two outdoor(a) nostrils for smelling and an operculum(a bony crustal plate which covers the gill-slits)one each view of the personate. The trunk is bi squint-eyedly flattened and cover with dermal scales. The diametrical vertical stabilizers are the pectoral muscle and pelvic fins. The dorsal fin weed be p transported or unp product lineed. Ventral, just ahead the anal fin opens the cloaca. On either side of the body is the lateral line (a group of sensory organs) which detects streaming fecal matters and vibrations in the water with which the fish determines its depth. The tail is muscular. Locomotion The fins control locomotion, which is caused by the muscular taillike (tail) fin of the fish. Fig.1:The dorsal and pelvic fins help to keep the body vertical when the fish makes a fast change of direction. The pectoral and pelvic fins balance and steer the fish as it moves.

The taillike fin curves slowly outwards and hence rapidly acantha to the midline, the tail thus presses backwards against the water and in this stylus the fish is impelled forward. This action is repeated on the other(a) side causing a further forward effort of the fish. The travel bladder, is situated in the trunk, below the vertebral column. or so fish fill the overwhelm bladder by suck in in circulate at the waters surface, others slowly fill the swim bladder with oxygen diffuse into it from the surrounding blood-vessels. Likewise, the volume of send can be reduced by letting air out... If you want to get a full essay, order it on our website: Orderessay

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