either of the fins of a fish that correspond to the forelimbs of a quadruped - Pectoral Fins, one of the paired fins of a fish that are homologous with the hind limbs of a quadruped - Pelvic Fins, the terminal fin of a fish or cetacean located behind the caudal peduncle : TAIL FIN - Caudal Fin, a canal along the side of a fish containing pores that open into tubes supplied with sense organs sensitive to low vibrations - Lateral Line, Ctenoid scales have a variously developed spiny posterior margin - Ctenoid Scales, an organ (as of a fish) for obtaining oxygen from water - Gills, the air bladder of a fish - Swim Bladder, a horny or shelly plate on the posterior dorsal surface of the foot in many gastropod mollusks that closes the shell when the animal is retracted - operculum, : a small, flattened, rigid, and definitely circumscribed plate forming part of the external body covering especially of a fish - Scales, to produce or deposit (eggs) —used of an aquatic animal - Spawning, a European freshwater cyprinid fish (Barbus barbus) with four barbels on its upper jawalso : any of various closely related fishe also : any of various closely related fish also : any of various closely related fishesalso : any of various closely related fishes - Barbels, one of the characteristic sensory organs of the lateral lines of fishes and various other lower vertebrates consisting of a cluster of sensory cells connected with nerve fibers - Neuromasts, a glass or earthenware flask with a globular body and two handles used especially by the ancient Romans to hold ointment, perfume, or wine - Ampullae, an organism (such as a frog) with a variable body temperature that tends to fluctuate with and is similar to or slightly higher than the temperature of its environment : a cold-blooded organism - Poikilothermic, a class or other category of fishes including the lungfishes, crossopterygians, teleosts, and especially formerly the arthrodires and ostracoderms and distinguished from other forms resembling fish by the presence of true bone in their skeleton - Osteichthyes, tapering toward each end - Fusiform, having the upper lobe larger than the lower with the vertebral column extending into the upper lobe - Heterocercal, having the upper and lower lobes approximately symmetrical and the vertebral column ending at or near the middle of the base - Homocercal, a usually translucent (see TRANSLUCENT sense 1) somewhat elastic tissue that composes most of the skeleton of vertebrate embryos and except for a small number of structures (such as some joints, respiratory passages, and the external ear) is replaced by bone during ossification in the higher vertebrates - cartilage, a male copulatory structure - clasper,

Zoology 7

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