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

"Pertaining to the abdomen or belly; situated in or on the abdomen: as <em>abdominal<em> ventral fins."-Wright, 1902

Abdominal

"Pertaining to the abdomen or belly; situated in or on the abdomen: as abdominal ventral fins."-Wright,

"Heterocercal tail of Acipenser. a, fulcra; b, osseous bucklers." &mdash; Encyclopedia Britannica, 1893

Acipenser

"Heterocercal tail of Acipenser. a, fulcra; b, osseous bucklers." — Encyclopedia Britannica, 1893

"Fore-limb of Acipenser." &mdash; Encyclopedia Britannica, 1893

Acipenser

"Fore-limb of Acipenser." — Encyclopedia Britannica, 1893

There are two predominant forms of stomach in fish- one is like a bent tube (siphonal), and the other a blind tube (caecal). The herring has a caeca. Labels: The esophagus. 2, Stomach. 3, Small intestine. 4, Caeca. 5, Air-bladder. 7, Pneumatic duct.

The Alimentary Canal of the Herring

There are two predominant forms of stomach in fish- one is like a bent tube (siphonal), and the other…

In some species of fish the small intestine is in two to eight coils. The large intestines are short and straight, and the termination of the rectum opens into a cavity called the Cloaca. Labels: 1, Liver, 2, 3, Caecas or pouches connecting with small intestines. 4, 5, Small intestine, coiled. 6, Large intestine. 7, Biliary duct.

The Alimentary Canal of the Swordfish

In some species of fish the small intestine is in two to eight coils. The large intestines are short…

"Diagram of the anterior fin (archipterygium) of Ceratodus." &mdash; Galloway

Archipterygium

"Diagram of the anterior fin (archipterygium) of Ceratodus." — Galloway

A diagram of the circulation of the blood through the branchial leaflets in a fish. Labels: 1. A section of the branchial arch. 2, A section of a branchial artery. 3, An artery sent along the outer margin of the process after the respiratory change has been effected ad returns it to the branchial vein.

A Diagram of the Circulation of the Blood Through the Branchial Leaflets in a Fish

A diagram of the circulation of the blood through the branchial leaflets in a fish. Labels: 1. A section…

"Anterior end of body of Branchiostoma. d, chorda dorsalis; e, spinal cord; f, cartilaginous rods; g, eye; h, branchial rods; i, labial cartilage; k, oral cirrhi." &mdash; Encyclopedia Britannica, 1893

Brachiostoma

"Anterior end of body of Branchiostoma. d, chorda dorsalis; e, spinal cord; f, cartilaginous rods; g,…

Brain of Petromyzon marinus (dorsal view).

Brain

Brain of Petromyzon marinus (dorsal view).

Section of the brain of porbeagle shark

Brain

Section of the brain of porbeagle shark

The brain of fish are small, it does not fill the whole cranial cavity, there being found within it a spongy fatty mass. Labels: 1, Olfactory ganglions. 2, Cerebrum. 3, Optic ganglions 4, Cerebellum. 5, Medulla Oblongata and Spinal Cord.

Brain of a Fish

The brain of fish are small, it does not fill the whole cranial cavity, there being found within it…

Brain of Petromyzon marinus (sea lamprey),dorsal view.

Brain of Sea Lamprey

Brain of Petromyzon marinus (sea lamprey),dorsal view.

In breathing, the mouth and gills of a fish open alternately; the water entering the mouth escapes by the opening of the gills. Shown is a section of the bronchial arch of a cod, with a pair processes supporting leaflets or plates. Labels: 1. A section of the branchial arch. 2, A pair of processes. 3, Branchial leaflets or plates. The number of leaflets in one process of the cod is about one thousand; in the salmon fourteen hundred; in the sturgeon sixteen hundred.

Section of a Branchial Arch of a Cod

In breathing, the mouth and gills of a fish open alternately; the water entering the mouth escapes by…

"Brain of Carcharias. ae, nervus acousticus; b, corpus restiforme; c, cerebellum; d, lobus opticus; e, hypophysis; g, nervus opticus; h, hemisphere; i, lobus olfactorius; i', olfactory pedicle; k, nervus olfactorius; l, epiphysis; m, nervus oculo-motorius; tr, nervus trigeminus; v, nervus vagus." &mdash; Encyclopedia Britannica, 1893

Carcharias Brain

"Brain of Carcharias. ae, nervus acousticus; b, corpus restiforme; c, cerebellum; d, lobus opticus;…

The inside view of a carp from the side.

Carp

The inside view of a carp from the side.

The inside view of a carp from the belly.

Carp

The inside view of a carp from the belly.

br: the branchiae, or gill-openingsc: the heartf: the livervn: swimming bladdersci: intestinal canalo: the ovariesu: urethraa: anuso': oviduct

Anatomy of the Carp

br: the branchiae, or gill-openings c: the heart f: the liver vn: swimming bladders ci: intestinal canal o:…

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

Cycloid Scale of the Carp

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

"Dermal dentricles of <em>Centrophorus</em>."&mdash;Finley, 1917

Dermal dentricles of Centrophorus

"Dermal dentricles of Centrophorus."—Finley, 1917

"Palatal view of skull of Ceratodus." &mdash; Encyclopedia Britannica, 1893

Ceratodus

"Palatal view of skull of Ceratodus." — Encyclopedia Britannica, 1893

"Fore-limb of Ceratodus." &mdash; Encyclopedia Britannica, 1893

Ceratodus

"Fore-limb of Ceratodus." — Encyclopedia Britannica, 1893

"Lung of Ceratodus, opened in its lower half to show its cellular pouches. a, right half; b, left half; c, cellular pouches; e, vena pulmonalis; f, arterial blood-vessel; oe, esophagus, opened to show glottis." &mdash; Encyclopedia Britannica, 1893

Ceratodus Lung

"Lung of Ceratodus, opened in its lower half to show its cellular pouches. a, right half; b, left half;…

A diagram of the circulation of a fish. Labels: 1, The pericardium. 2, The single auricle. 3, The single ventricle. 4, The vessel that conveys the blood from the ventricle to the gills. 5, The vessel that conveys the blood from the body to the heart. The arrows show the direction of the blood.

Circulation of a Fish

A diagram of the circulation of a fish. Labels: 1, The pericardium. 2, The single auricle. 3, The single…

Diagram of the circulation of the fish. Labels: a, branchial circulation; b, somatic circulation; c, heart; d, auricle; e, ventricle; f, arterial trunk.

Circulation of a Fish

Diagram of the circulation of the fish. Labels: a, branchial circulation; b, somatic circulation; c,…

"The skull of a cod. b, branchiostegal rays born on c.h., the ceratohyal bone; d, dentary portion of the mandible; f, frontal; h.m., hyomandibular; i.o., interoperculum; l, lachrymal; m, maxilla; n, nasal; o, operculum; p.m., premaxilla; p.o., preoperculum; p.s., parasphenoid; q, quadrate; s.o., sub-operculum; s.oc., supra-occipital." &mdash; Galloway

Cod Skull

"The skull of a cod. b, branchiostegal rays born on c.h., the ceratohyal bone; d, dentary portion of…

"Central organs of the circulaion, gills, and renal organs of Sepia officinalis. a, aorta; v, vena cava; v' visceral veins; c, systemic heart; d, dilatations of branchial veins on entering the heart; e, branchial hearts; b, branchiae; r, renal organs." &mdash; Encyclopedia Britannica, 1893

Cuttlefish Organs

"Central organs of the circulaion, gills, and renal organs of Sepia officinalis. a, aorta; v, vena cava;…

"An internal support of a calcareous nature, and formed in laminae; this is the well-known <em>cuttlefish bone</em>, used fro cage birds, and also for making <em>pounce</em>; when reduced to powder, it is employed as a mould for fine castings." &mdash; Goodrich, 1859

Bone of the cuttle-fish

"An internal support of a calcareous nature, and formed in laminae; this is the well-known cuttlefish

Head of a cuttlefish, showing the brain cavity.

Head of cuttlefish

Head of a cuttlefish, showing the brain cavity.

"Membranous cartilage skull of <em>Cyclostoma</em>."&mdash;Finley, 1917

Skull of Cyclostoma

"Membranous cartilage skull of Cyclostoma."—Finley, 1917

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

Ganoid Scales of Dipterus

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

"Dissected fish. a, air bladder; b, urinary bladder; b, urinary bladder; br, brain; c, spinal cord; d and da, dorsal fins; dv, anal fin; e, body of the vertebra; g, gills receiving the blood from the ventral aorta leading out of the heart h; i, intestine; k, kidney; l, liver; m, spines of the vertebra; n, auricle of the heart; ov, ovary; ovd, oviduct; st, stomach; sp, spleen; u, ureter." &mdash;Davison, 1906

Dissected Fish

"Dissected fish. a, air bladder; b, urinary bladder; b, urinary bladder; br, brain; c, spinal cord;…

The egg case of a dogfish.

Dogfish Egg-Case

The egg case of a dogfish.

"Embryo dogfish in egg-case ("mermaid's purse") which has been cut open to show contents. e.g., "External" gills; d.f., dorsal fin fold; y.s., yolk-sac; st., stalk of yolk-sac; T., tendrils, prolongations of egg-case by means of which it is moored to seaweed, and "adaptation" in a dead substance." -Thomson, 1916

Dogfish Embryo

"Embryo dogfish in egg-case ("mermaid's purse") which has been cut open to show contents. e.g., "External"…

"Development of eel. Change from Leptocephalus shape (I.) to "Elver" shape (V.)." -Thomson, 1916

Eel Development

"Development of eel. Change from Leptocephalus shape (I.) to "Elver" shape (V.)." -Thomson, 1916

An illustration of a egg sack of a nursehound fish.

Egg Sack of Nursehound

An illustration of a egg sack of a nursehound fish.

"Shark's egg laid open to show the position of the young fish" &mdash; Goodrich, 1859

Shark's egg

"Shark's egg laid open to show the position of the young fish" — Goodrich, 1859

The eye of a fish. The anterior to posterior diameter has been decreased.

Fish Eye

The eye of a fish. The anterior to posterior diameter has been decreased.

An illustration of a fish fin.

Fish Fin

An illustration of a fish fin.

Outline of a fish, showing the "paired" and "median" fins. (p) one of the pectoral fins; (v) one of the ventral fins; (d) first dorsal fin; (d') second dorsal fin; (a) anal fin; (c) caudal fin.

Fish

Outline of a fish, showing the "paired" and "median" fins. (p) one of the pectoral fins; (v) one of…

This is a diagram of the cross section of a fish, showing the bilateral symmetry of the parts: dv, dorsoventral axis; vl, right-left axis. a.p., anterior appendage; b.c., body cavity; ch, notochord; d.f., dorsal fin; g, gut; h, heart; h.a., haemal arch; m, muscles; n.., neural arch; sp, spinal cord; v.c., vertebral column.

Fish

This is a diagram of the cross section of a fish, showing the bilateral symmetry of the parts: dv, dorsoventral…

"Diagram of the principal vessels in the circulation of a fish, ventral view. a, aorta; au., auricle; br.a., afferent branchial arteries; br.e., efferent branchial arteries; bu., bulbus (or conus) arteriosus; c, carotid; c.a., caudal artery; c.v.r., right cardinal vein; c.v.l., left cardinal vein; d.a., dorsal artery; d.c., ductus Cuvieri; g, gills; h.v., hepatic vein; h.p., hepatic portal vein; i, intestine; j, jugular vein; k, kidney; l, liver; r.p., renal portal vein; s.v., sinus venosus; v, ventricle." &mdash; Galloway

Fish Circulation

"Diagram of the principal vessels in the circulation of a fish, ventral view. a, aorta; au., auricle;…

"Diagram of the principal vessels in the circulation of a Fish, lateral view. a, aorta; au., auricle; br.a., afferent branchial arteries; br.e., efferent branchial arteries; bu., bulbus (or conus) arteriosus; c, carotid; c.a., caudal artery; c.v.r., right cardinal vein; c.v.l., left cardinal vein; d.a., dorsal artery; d.c., ductus Cuvieri; g, gills; h.v., hepatic vein; h.p., hepatic portal vein; i, intestine; j, jugular vein; k, kidney; l, liver; r.p., renal portal vein; s.v., sinus venosus; v, ventricle." -Galloway, 1915

Fish Circulation Vessels

"Diagram of the principal vessels in the circulation of a Fish, lateral view. a, aorta; au., auricle;…

An illustration of a fish fossil.

Fish Fossil

An illustration of a fish fossil.

This figure shows the mode of respiration in fishes. The gills are seen bent over in the form of a feather. Labels: d, the auricle of the heart; e, the ventricle; f, the bronchial artery; g,g, the gills.

Respiration in Fishes

This figure shows the mode of respiration in fishes. The gills are seen bent over in the form of a feather.…

"Salmo fario, the entire skull, from the left side. art, articular; branchiost, branchiostegal rays; dent, dentary; epiot, epiotic; eth, supra-ethnoid; fr, frontal; hyom, hyomandibular; intop, inter-opercular; pal, palantine; par, parietal; pmx, pre-maxilla; praop, pre-opercular; pt, pterygoid; pter, pterotic; Quad, quadrate; socc, supra-occipital; sphot, sphenotic; subop, sub-opercular; sympl, symplectic; Zunge, basi-hyal." -Parker, 1900

Fish Skull

"Salmo fario, the entire skull, from the left side. art, articular; branchiost, branchiostegal rays;…

"Diagram of vertebrae of a bony fish. A, caudal; B, trunk. c, centrum or body of the vertebra; ch., the notochord; h.a., haemal arch; h.c., haemal canal; h.s., haemal spine; h.z., haemal zygapophysis, or articulating facet; m.b., inter-muscular bone; n.a., neural arch; n.c., neural canal; n.s., neural spine; n.z., neural zygapophysis; r, rib." -Galloway, 1915

Fish Vertebrae

"Diagram of vertebrae of a bony fish. A, caudal; B, trunk. c, centrum or body of the vertebra; ch.,…

This is the skeleton of an angler fish (Lophius piscatorius).

Angler Fish

This is the skeleton of an angler fish (Lophius piscatorius).

In fish the chief masses of the muscular system are disposed on each side of the trunk in a series of plates or flakes corresponding in number to the vertebrae. Labels: a,b,c, and 1,2,3, The zigzag arrangement of the flakes.

The Muscles of a Fish

In fish the chief masses of the muscular system are disposed on each side of the trunk in a series of…

The skeleton of a fish.

The Skeleton of a Fish

The skeleton of a fish.

"Diagrams of some principal forms of tails in fishes. A, protocercal fin (as in Polypterus); B, heterocercal (as in Sharks); C, homocercal (as in most Teleosts); D, homocercal (as in Amia)." -Galloway, 1915

Fishtails

"Diagrams of some principal forms of tails in fishes. A, protocercal fin (as in Polypterus); B, heterocercal…

Section through the gill arch and plates of a bony fish. Labels: b, gill plates with capillaries; c, afferent vessels with venous blood; d, efferent vessel with arterial blood; a, skeleton of arch.

Gill Arch and Plates

Section through the gill arch and plates of a bony fish. Labels: b, gill plates with capillaries; c,…

This illustration shows the gills (breathing apparatus) of a perch, as well as the specific veins and arteries running along the branchial arch.

Gills (Branchial Arch of Perch)

This illustration shows the gills (breathing apparatus) of a perch, as well as the specific veins and…

This illustration shows the thorax of a crayfish with a portion of the carapace removed to show the gills.

Gills (Crayfish)

This illustration shows the thorax of a crayfish with a portion of the carapace removed to show the…

"Diagram illustrating gills or branchiae. b.c., cavity in which the body fluids circulate; br., branchial filaments which are merely much thinned out-pocketings of the body wall (w); ex, the external medium&ndash;water&ndash;in which the oxygen is dissolved." -Galloway, 1915

Gills or Branchiae

"Diagram illustrating gills or branchiae. b.c., cavity in which the body fluids circulate; br., branchial…

"Gill of Fish. A, first branchial arch of left side of black-bass: 1, gill-rakers; 2, branchial lamellae. C, same, in cross-section: 7, branchial lamellae; 8, a gill-raker. B, same arch of striped-bass, with appendages removed: 3, 4, 5, and 6, pharyngobranchial, epibranchial, ceratobranchial, and hypobranchial segments." -Whitney, 1911

Parts of Fish Gills

"Gill of Fish. A, first branchial arch of left side of black-bass: 1, gill-rakers; 2, branchial lamellae.…

The skeleton of a haddock.

Haddock

The skeleton of a haddock.

"The haddock. n.a., Nasal apertures (double on each side); d.f.1, d.f.2, d.f.3, dorsal unpaired fins; c.f., the caudal fin of the homocercal tail. b., Barbule; op., operculum covering the four gills; br.m., continuation of the gill-cover forming the branchiostegal membrane; pv.f., pelvic fin (=hind-limb)--note its jugular position in front of p.f., the pectoral fin (=fore-limb)." -Thomson, 1916

Haddock

"The haddock. n.a., Nasal apertures (double on each side); d.f.1, d.f.2, d.f.3, dorsal unpaired fins;…

The skeleton of a haddock. In some species such as the haddock, there is a modified form of the coracoid bone, free at its lower extremities, which may, perhaps, subserve the purpose of the clavicle of the higher animals.

Skeleton of a Haddock

The skeleton of a haddock. In some species such as the haddock, there is a modified form of the coracoid…

"Median longitudinal section of anterior region of Myxine. B., Barbule; N., nasal aperture; NT., nasal tube with rings of cartilage; NC., nasal capsule; BR., brain; SC., spinal cord; N., notochord; G., gut; T., cartilage of "tongue"; MU., muscle; NTT., posterior part of nasal sac; TP., a tooth plate; MT., median tooth on roof of mouth (M.)." -Thomson, 1916

Hagfish Anterior

"Median longitudinal section of anterior region of Myxine. B., Barbule; N., nasal aperture; NT., nasal…

"Respiratory system of hag, from ventral surface. b., Barbules; m., mouth opening on ventral surface; g., gullet; g.p'., first gill-pouch, cut open to show internal lamellae; g.p.6, sixth gill-pouch; v., ventricle of heart; ao., aorta; a., common exhalant aperture." -Thomson, 1916

Hagfish Respiratory System

"Respiratory system of hag, from ventral surface. b., Barbules; m., mouth opening on ventral surface;…