This ClipArt gallery offers 135 illustrations of the anatomy of fish, including organ diagrams, skeletal diagrams, fish eggs, and more for numerous species.

"Bdellostoma stouti (Californian hag), enveloped in sheath of mucus. b., barbules e., eyes m. mucus; eg., eggs." -Thomson, 1916

Californian Hagfish

"Bdellostoma stouti (Californian hag), enveloped in sheath of mucus. b., barbules e., eyes m. mucus;…

A diagram of the heart of a fish. Labels: 1, Pericardium. 2, The ventricle that receives the blood from the body. 3, The ventricle that sends the blood to the gills.

A Diagram of the Heart of a Fish

A diagram of the heart of a fish. Labels: 1, Pericardium. 2, The ventricle that receives the blood from…

"Hyoid arch, branchial apparatus, and scapulary arch of the Perca." — Encyclopedia Britannica, 1893

Hyoid Arch

"Hyoid arch, branchial apparatus, and scapulary arch of the Perca." — Encyclopedia Britannica,…

"Hyoid bone of the Perch." — Encyclopedia Britannica, 1893

Hyoid Bone

"Hyoid bone of the Perch." — Encyclopedia Britannica, 1893

"Diagram to show the way in which an outgrowing gill-process bearing blood-holding lamellae, may give rise, if the sternal body wall sings inwards, to a lung-chamber with air-holding lamellae. I is the embryonic condition. L is the condition of outgrowth with gl, gill lamellae. A is the condition of insinging of the sternal surface and consequent enclosure of the lamelligerous surface of the appendage in a chamber with narrow orifice—the pulmonary air-holding chamber. pl, Pulmonary lamellae. bs, Blood sinus." — The Encyclopedia Britannica, 1910

Lamellae

"Diagram to show the way in which an outgrowing gill-process bearing blood-holding lamellae, may give…

"Skeleton of Ceratodus fin. a., Central axis; r., radials; h., basal piece." -Thomson, 1916

Queensland Lungfish Fin

"Skeleton of Ceratodus fin. a., Central axis; r., radials; h., basal piece." -Thomson, 1916

"Head region of Protopterus. sn.t., Sensory tubes; l.l., lateral line; e.br., external gills; pc.l., pectoral fin; op., operculum." -Thomson, 1916

African Lungfish Head

"Head region of Protopterus. sn.t., Sensory tubes; l.l., lateral line; e.br., external gills; pc.l.,…

"Diagram of the heart and branchial arches in Protopterus (one of the Dipno). pre.c., precaval vein, made up of right and left jugulairs, subclavians, etc.; post.c., postcaval, made up the cardinals, right and left...a, aorta; au., auricle; c, carotid; c.v., cardinal veins (right and left); d.a., dorsal arteries; j, jugular veins; d.c., ductus Cuvieri; s.v., sinus venosus; v, ventricle." -Galloway, 1915

African Lungfish Heart

"Diagram of the heart and branchial arches in Protopterus (one of the Dipno). pre.c., precaval vein,…

"Diagram of heart and branchial arches in Ceratodus (one of the Dipnoi). a.b., air bladder (lung); p.a., pulmonary artery; p.c., post caval vein (right); p.v., pulmonary vein...a, aorta; au., auricle; c, carotid; c.v., cardinal veins (right and left); d.a., dorsal arteries; j, jugular veins; d.c., ductus Cuvieri; s.v., sinus venosus; v, ventricle." -Galloway, 1915

Queensland Lungfish Heart

"Diagram of heart and branchial arches in Ceratodus (one of the Dipnoi). a.b., air bladder (lung); p.a.,…

Flounder have both eyes situated on one side of the head, they are not born this way. Their life involves metamorphosis. During metamorphosis, one eye migrates to the other side of the body so that both eyes are situated on the upward-facing side of its body. After metamorphosis, flounder lie on one side on the ocean floor; either the left or right side might face upward depending on the species. This is the different stages of the flounder. Note the eyes in the young flounder are arranged one on each side of the head.

Metamorphosis of a Flounder

Flounder have both eyes situated on one side of the head, they are not born this way. Their life involves…

"Restored skeleton of Palaeospondylus gunni. d.c., Cirri of dorsal margin; l.c., long lateral cirri; v.c., cirri of ventral margin; n., nasal ring; t.p., anterior trabeculo-palatine part of cranium; b., anterior depression or fenestra; c., posterior depression or fenestra; a., lobe divided off from anterior part; p.a., posterior or parachordal part of cranium; x., post-occipital plates." -Thomson, 1916

Palaeospondylus Gunni

"Restored skeleton of Palaeospondylus gunni. d.c., Cirri of dorsal margin; l.c., long lateral cirri;…

External features of a perch.

Perch

External features of a perch.

digestive, excretory, and reproductive systems of a perch.

Perch

digestive, excretory, and reproductive systems of a perch.

Circulatory system of a perch.

Perch

Circulatory system of a perch.

"Brain of Perch. Upper aspect. a, cereoellum; b, optic lobes; c, hemispheres; e, lobi inferiores; f, hypophysis; g, lobi posteriores; i, olfactory lobes; n, nervus opticus; o, nervus olfactorius; p, nervus olulo-motorius; g, nervus trochlearis; r, nervus trigeminus; s, nervus acousticus; t, nrvus vagus; u, nervus abducens; v, fourth ventricle." — Encyclopedia Britannica, 1893

Perch Brain

"Brain of Perch. Upper aspect. a, cereoellum; b, optic lobes; c, hemispheres; e, lobi inferiores; f,…

"Brain of Perch. Lower aspect. a, cereoellum; b, optic lobes; c, hemispheres; e, lobi inferiores; f, hypophysis; g, lobi posteriores; i, olfactory lobes; n, nervus opticus; o, nervus olfactorius; p, nervus olulo-motorius; g, nervus trochlearis; r, nervus trigeminus; s, nervus acousticus; t, nrvus vagus; u, nervus abducens; v, fourth ventricle." — Encyclopedia Britannica, 1893

Perch Brain

"Brain of Perch. Lower aspect. a, cereoellum; b, optic lobes; c, hemispheres; e, lobi inferiores; f,…

"The bones of fishes are of a less dense and compact nature than in the higher order of animals; in some, indeed, they are wholly cartilaginous. The skeleton may in general be divided into four chief parts - the Vertical Column, the Head, the Repiratory Apparatus, and the Limbs" — Goodrich, 1859

Perch skeleton

"The bones of fishes are of a less dense and compact nature than in the higher order of animals; in…

"The spinal column consists of abdominal and caudal vertebre, the coalescence of the parapophyses into a complete hemal ring and the suspension of the anal fin generally forming a sufficiently well-marked boundary between the abdominal and caudal regions." — Encyclopedia Britannica, 1893

Perch Skeleton

"The spinal column consists of abdominal and caudal vertebre, the coalescence of the parapophyses into…

"Skeleton of Fish (Perch). a, intermaxillaries; b, nasal region; c, dentary bone of mandible; d, orbit of eye; e, supraoccipital crest; f, preoperculum; g, g', vertebral column; h, pectoral fin; i, ventral fin; k, first dorsal fin; l, second dorsal fin; m, anal fin; n, n, caudal fin, making a homocercal tail." -Whitney, 1911

Skeleton of Perch

"Skeleton of Fish (Perch). a, intermaxillaries; b, nasal region; c, dentary bone of mandible; d, orbit…

"Skeleton of the Perch's Skull." — Encyclopedia Britannica, 1893

Perch Skull

"Skeleton of the Perch's Skull." — Encyclopedia Britannica, 1893

"Lower view of skull of perch." — Encyclopedia Britannica, 1893

Perch Skull

"Lower view of skull of perch." — Encyclopedia Britannica, 1893

The skeleton of a perch.

Skeleton of Perch

The skeleton of a perch.

"Cartilaginous Cranium of the Pike (Esox lucius), with its intrinsic ossifications. A, top view; 3, small ossifications in the rostrum; N, N, nasal fossae; I Or, interorbital septum; Eth, ethmoid; Prf, Ptf, prefrontal and postfrontal; EpO, epiotic; OpO, opisthotic; Pt, pteriotic; EO, exoccipital." -Whitney, 1911

Pike Cranium

"Cartilaginous Cranium of the Pike (Esox lucius), with its intrinsic ossifications. A, top view; 3,…

"Cartilaginous Cranium of the Pike (Esox lucius), with its intrinsic ossifications. B, side view: V, VII, exits of trigeminal and of pneumogastric nerves; 3, small ossifications in the rostrum; I Or, interorbital septum; Eth, ethmoid; Prf, Ptf, prefrontal and postfrontal; PrO, proötic; EpO, epiotic; OpO, opisthotic; Pt, pteriotic; EO, exoccipital; BO, basioccipital; BS, basisphenoid; AS, alisphenoid." -Whitney, 1911

Pike Cranium

"Cartilaginous Cranium of the Pike (Esox lucius), with its intrinsic ossifications. B, side view: V,…

"Pectoral arch and fore limb of the pike (Esox lucius), an osseous fish, showing scapulocoracoid, composed of Scp, scapula or hypercoracoid; c, posterior end of the outer margin of the scapulocoracoid; b, b, 1, 2, 3, 4, 5, five fin-rays or radialia; a, actinosts or basalia." -Whitney, 1911

Pike Scapulocoracoid

"Pectoral arch and fore limb of the pike (Esox lucius), an osseous fish, showing scapulocoracoid, composed…

"Skull of Polyodon. n, nasal cavity; sq, squamosal; mh, hyomandibular; sy, symplectic; pa, palate-pterygold; m, Meckelian cartiledge; mx, maxillary; d, dentary; h, hyoid; op, operculum; br, branchiostergal; s.cl, supraclavicular; p.cl, postclavicular; cl, clavicle; i.cl, infraclavicular." — Encyclopedia Britannica, 1893

Polyodon

"Skull of Polyodon. n, nasal cavity; sq, squamosal; mh, hyomandibular; sy, symplectic; pa, palate-pterygold;…

"Brain of Polypterus. Upper aspect. a, medulia; b, corpora restiformia; c, cerebellum; d, lobi optici; e, hypophysis; f, fissura cerebri magna; g, nervus opticus; g', chiasma; h, hemispheres; i, lobus olfactorius; k, sinus rhomboidalis (fourth ventricle)." — Encyclopedia Britannica, 1893

Polypterus Brain

"Brain of Polypterus. Upper aspect. a, medulia; b, corpora restiformia; c, cerebellum; d, lobi optici;…

"Brain of Polypterus. Lateral aspect. a, medulia; b, corpora restiformia; c, cerebellum; d, lobi optici; e, hypophysis; f, fissura cerebri magna; g, nervus opticus; g', chiasma; h, hemispheres; i, lobus olfactorius; k, sinus rhomboidalis (fourth ventricle)." — Encyclopedia Britannica, 1893

Polypterus Brain

"Brain of Polypterus. Lateral aspect. a, medulia; b, corpora restiformia; c, cerebellum; d, lobi optici;…

"Brain of Polypterus. Lower aspect. a, medulia; b, corpora restiformia; c, cerebellum; d, lobi optici; e, hypophysis; f, fissura cerebri magna; g, nervus opticus; g', chiasma; h, hemispheres; i, lobus olfactorius; k, sinus rhomboidalis (fourth ventricle)." — Encyclopedia Britannica, 1893

Polypterus Brain

"Brain of Polypterus. Lower aspect. a, medulia; b, corpora restiformia; c, cerebellum; d, lobi optici;…

"Upper aspect of the primordial cranium, with the membrane-bones removed. An, angular; ao, anteorbital; Ar, articulary; B, basal; D, dentary; E, ethmoid; F, frontal; Ma, mastoid; Mp, metapterygold; Mx, maxillary; N, nasal; O, operculum; Oc, occipital; Pa, parietal; Pl, palatine; Pmx, premaxillary; po, postorbital; Prf, prefrontal; Pt, post-temporals; Ptf, postfrontal; Ptr, pterygold; Q, quadrate; S, suspensorium; So, suboperculum; Sp, sphenold; Spl, splenial; St, supratemporals; T, tympanic lamina; Tu, turbinal; v, vomer; x x, small ossicles; x' x', spiraculars." — Encyclopedia Britannica, 1893

Polypterus Skull

"Upper aspect of the primordial cranium, with the membrane-bones removed. An, angular; ao, anteorbital;…

"Lower aspect of the primordial cranium, with the membrane-bones removed. An, angular; ao, anteorbital; Ar, articulary; B, basal; D, dentary; E, ethmoid; F, frontal; Ma, mastoid; Mp, metapterygold; Mx, maxillary; N, nasal; O, operculum; Oc, occipital; Pa, parietal; Pl, palatine; Pmx, premaxillary; po, postorbital; Prf, prefrontal; Pt, post-temporals; Ptf, postfrontal; Ptr, pterygold; Q, quadrate; S, suspensorium; So, suboperculum; Sp, sphenold; Spl, splenial; St, supratemporals; T, tympanic lamina; Tu, turbinal; v, vomer; x x, small ossicles; x' x', spiraculars." — Encyclopedia Britannica, 1893

Polypterus Skull

"Lower aspect of the primordial cranium, with the membrane-bones removed. An, angular; ao, anteorbital;…

"Side view, with the membrane-bones. An, angular; ao, anteorbital; Ar, articulary; B, basal; D, dentary; E, ethmoid; F, frontal; Ma, mastoid; Mp, metapterygold; Mx, maxillary; N, nasal; O, operculum; Oc, occipital; Pa, parietal; Pl, palatine; Pmx, premaxillary; po, postorbital; Prf, prefrontal; Pt, post-temporals; Ptf, postfrontal; Ptr, pterygold; Q, quadrate; S, suspensorium; So, suboperculum; Sp, sphenold; Spl, splenial; St, supratemporals; T, tympanic lamina; Tu, turbinal; v, vomer; x x, small ossicles; x' x', spiraculars." — Encyclopedia Britannica, 1893

Polypterus Skull

"Side view, with the membrane-bones. An, angular; ao, anteorbital; Ar, articulary; B, basal; D, dentary;…

"Lower aspect of the skull, part of the bones being removed on the side. An, angular; ao, anteorbital; Ar, articulary; B, basal; D, dentary; E, ethmoid; F, frontal; Ma, mastoid; Mp, metapterygold; Mx, maxillary; N, nasal; O, operculum; Oc, occipital; Pa, parietal; Pl, palatine; Pmx, premaxillary; po, postorbital; Prf, prefrontal; Pt, post-temporals; Ptf, postfrontal; Ptr, pterygold; Q, quadrate; S, suspensorium; So, suboperculum; Sp, sphenold; Spl, splenial; St, supratemporals; T, tympanic lamina; Tu, turbinal; v, vomer; x x, small ossicles; x' x', spiraculars." — Encyclopedia Britannica, 1893

Polypterus Skull

"Lower aspect of the skull, part of the bones being removed on the side. An, angular; ao, anteorbital;…

Structure of the protonephridium (excretory organ) of a shark. Labels: Wtr, ciliated funnels; Ug, segmental duct.

Protonephridium of a Shark

Structure of the protonephridium (excretory organ) of a shark. Labels: Wtr, ciliated funnels; Ug, segmental…

"Nostrils of Raia lemprieri, with nasal flaps reverted." — Encyclopedia Britannica, 1893

Raia Lemprieri

"Nostrils of Raia lemprieri, with nasal flaps reverted." — Encyclopedia Britannica, 1893

"Larger aspect of head of Raia lemprieri." — Encyclopedia Britannica, 1893

Raia Lemprieri

"Larger aspect of head of Raia lemprieri." — Encyclopedia Britannica, 1893

Transverse section of the ramus visceralis of the vagus of skate. Labels: v.g., visceralis ganglion; m.m.f., median medullated fibers; s.m.f., small medullated fibers.

Ramus Viseralis

Transverse section of the ramus visceralis of the vagus of skate. Labels: v.g., visceralis ganglion;…

"Arrangement of scales in the Roach (Leuciscus rutilus). L, Lateral line; t r, transverse line; a, transverse line from lateral line to yentral fin." — Encyclopedia Britannica, 1893

Roach Scale Arrangement

"Arrangement of scales in the Roach (Leuciscus rutilus). L, Lateral line; t r, transverse line; a, transverse…

"The early development of the salmon. 1, The fertilised egg; 2, the egg just before hatching; 3, the newly hatched salmon; 4 and 5, the larval salmon nourished from yolk-sac (y.s.) which is diminishing while the fish is increasing in size; 6, the salmon with yolk absorbed (about six weeks old)." -Thomson, 1916

Salmon Development

"The early development of the salmon. 1, The fertilised egg; 2, the egg just before hatching; 3, the…

"The Sawfish is so called from the saw-like weapon into which the snout is produced. They are common in tropical and less so in subtropical seas, and attain a considerable size, specimens with a saw six feet long and a foot broad at the base being far from rare. Their offensive weapon renders them dangerous to almost all other large inhabitants of the ocean."—(Charles Leonard-Stuart, 1911)

Sawfish Head

"The Sawfish is so called from the saw-like weapon into which the snout is produced. They are common…

"Cycloid scale of Scopelus resplendens." — Encyclopedia Britannica, 1893

Scale

"Cycloid scale of Scopelus resplendens." — Encyclopedia Britannica, 1893

"Cycloid scale of Gobius ommaturus." — Encyclopedia Britannica, 1893

Scale

"Cycloid scale of Gobius ommaturus." — Encyclopedia Britannica, 1893

"Cycloid scale from the lateral line of Odax linealus." — Encyclopedia Britannica, 1893

Scale

"Cycloid scale from the lateral line of Odax linealus." — Encyclopedia Britannica, 1893

Fishes are sometimes classed, in accordance with the structure of their scale, into Ctenoid, Ganoid, Cycloid, and Placoid. This illustration is Placoid scale of Ray.

Placoid Scale of Ray

Fishes are sometimes classed, in accordance with the structure of their scale, into Ctenoid, Ganoid,…

Fishes are sometimes classed, in accordance with the structure of their scale, into Ctenoid, Ganoid, Cycloid, and Placoid. This is an illustration of a Ctenoid Scale of the Perch.

Ctenoid, Scale

Fishes are sometimes classed, in accordance with the structure of their scale, into Ctenoid, Ganoid,…

"Ganoid scales of Dapedius." — Encyclopedia Britannica, 1893

Scales

"Ganoid scales of Dapedius." — Encyclopedia Britannica, 1893

Scales of fishes; cycloid scale (Pike).

Fish Scales

Scales of fishes; cycloid scale (Pike).

Scales of fishes; Ctenoid scale (Perch)

Fish Scales

Scales of fishes; Ctenoid scale (Perch)

Scales of fishes; Placoid scale (Thornback)

Fish Scales

Scales of fishes; Placoid scale (Thornback)

Scales of fishes; Ganoid Scale (Palaeoniscus)

Fish Scales

Scales of fishes; Ganoid Scale (Palaeoniscus)

An illustration of the median longitudinal section through anterior end of the sea lamprey. "a.v.o, Antrio-ventricular opening; br, Brain; br.o, Internal opening of gill sac; d.a, Dorsal aorta; d.c, Ductus cuvieri; h.v, Hepatic vein; i.j.v, Inferior jugular vein; N, Notochord; oes, Esophagus; olf, Olfactory organ; oc, Pericardium; p.c.v, Left posterior cardinal vein; pit, Pituitary tube; V, Ventricle; v, Velum." (Britannica, 1910)

Cross Section View of a Sea Lamprey

An illustration of the median longitudinal section through anterior end of the sea lamprey. "a.v.o,…

"Shark is an English popular name for any individual of the group Selachoidei. Sharks are scaleless, and the skin usually rough. They are numerous in tropical seas, becoming scarcer as they recede from the warmer regions, a few only reaching the Arctic circle. They are rapid swimmers, with great power of endurance; the larger sharks are exclusively carnivorous, and some of them extremely dangerous to man. They scent their food from a distance, and are readily attracted by the smell of blood or decomposing bodies. The flesh of sharks is coarse, but it is sometimes eaten. Their rough skin is employed by joiners to polish fine-grained wood, and by cutlers to cover the hilts of swords to make them firmer in the grasp. [Pictured] Egg of Scyllium Chilense"—(Charles Leonard-Stuart, 1911)

Shark Egg

"Shark is an English popular name for any individual of the group Selachoidei. Sharks are scaleless,…

"Side view of chief cranial nerves of Elasmobranchs." -Thomson, 1916

Shark Nerves

"Side view of chief cranial nerves of Elasmobranchs." -Thomson, 1916

"Siphonal stomach and spiral valve of Basking-shark (Selache). a, esophagus; b, cardiac portion of stomach; c, pyloric portion; d, pouch intermediate between stomach and duodenum, with circular valves at both ends; e, duodenum; f, valve of intestine; g, ductus hepaticus; h, spleen." — Encyclopedia Britannica, 1893

Shark Stomach

"Siphonal stomach and spiral valve of Basking-shark (Selache). a, esophagus; b, cardiac portion of stomach;…

Two teeth of sharks: "436, Carcharodon angustidens; 435, Lamna elegans." -Dana, 1883

Shark Teeth

Two teeth of sharks: "436, Carcharodon angustidens; 435, Lamna elegans." -Dana, 1883

"Lateral view of caudal vertebra of Basking Shark (Selache mazima). a, centrum; b, neurapophysis; c, intercrural cartilage; d, hemapophysis; e, spinal canal; f, intervertebal cavity; g, central canal for persistent portion of notochord; h, hemal canals for blood-vessels." — Encyclopedia Britannica, 1893

Shark Vertebra

"Lateral view of caudal vertebra of Basking Shark (Selache mazima). a, centrum; b, neurapophysis; c,…

"Longitudinal section of caudal vertebra of Basking Shark (Selache mazima). a, centrum; b, neurapophysis; c, intercrural cartilage; d, hemapophysis; e, spinal canal; f, intervertebal cavity; g, central canal for persistent portion of notochord; h, hemal canals for blood-vessels." — Encyclopedia Britannica, 1893

Shark Vertebra

"Longitudinal section of caudal vertebra of Basking Shark (Selache mazima). a, centrum; b, neurapophysis;…

"Transverse section of caudal vertebra of Basking Shark (Selache mazima). a, centrum; b, neurapophysis; c, intercrural cartilage; d, hemapophysis; e, spinal canal; f, intervertebal cavity; g, central canal for persistent portion of notochord; h, hemal canals for blood-vessels." — Encyclopedia Britannica, 1893

Shark Vertebra

"Transverse section of caudal vertebra of Basking Shark (Selache mazima). a, centrum; b, neurapophysis;…

The jaws and teeth of the common skate (ray).

Skate

The jaws and teeth of the common skate (ray).

Mouth and gill slits of the common skate (ray).

Skate

Mouth and gill slits of the common skate (ray).