Fish Model, Superior

Quick Answer: The fish model, superior, is a Superior grade zoological model of a fish used to teach the body plan of fishes: fins, scales, gills and, in opened designs, the internal organs. A superior fish model gives school and college zoology classes a reusable alternative to a preserved specimen.

What a Fish Model Teaches

The outside of a bony fish is a lesson in adaptation to water. The streamlined, spindle-shaped body reduces drag; paired pectoral and pelvic fins steer and brake, while the dorsal, anal and caudal fins give stability and thrust. A bony flap, the operculum, shields the gills, and a line of sense organs, the lateral line, runs down each flank to pick up vibrations and water movement.

Many zoology fish models also open the body wall to show the organs inside. Students then locate the gills with their red filaments behind the operculum, the two-chambered heart below them, the liver, stomach and intestine, the kidneys along the backbone, the gonads and the silvery swim bladder that controls buoyancy. Whether this model is opened in that way, and which species it represents, is not stated in the title.

Superior is given as the grade, with no description of what it includes. Colleges wanting a particular fish, such as a local carp, or a dogfish to represent cartilaginous fishes, should make that clear when ordering.

Zoology Uses

• Identifying fins and external features and linking them to swimming
• Explaining gill respiration and the counter-current flow of water and blood
• Comparing the two-chambered fish heart with amphibian and mammalian hearts
• Classification lessons contrasting bony and cartilaginous fishes

Care & Handling

• Support the superior fish model under its body or base; fin edges and the tail are thin and chip easily.
• Clean with a soft, just-damp cloth and dry it at once; do not use solvent cleaners on painted scales.
• Store the model away from heat and direct sunlight to keep its colours and varnish in good condition.

Specifications

Why Choose LabEquip

Zoology departments that no longer use preserved fish, or that want a demonstration piece for years of classes, often choose a higher-grade fish model. LabEquip offers it in its biology lab products, and the fish internal anatomy chart labels the organs for revision. Send species preferences through the LabEquip contact page.

Frequently Asked Questions

Which fish does this model represent?

The listing names neither the species nor the form. Teaching fish models commonly represent a typical bony fish such as a carp or perch, so if your syllabus names a particular fish, mention it when you enquire.

What is the function of the swim bladder?

The swim bladder is a gas-filled sac in bony fishes. By adjusting the amount of gas in it, the fish controls its buoyancy and can hold a chosen depth without swimming constantly. Sharks and rays do not have one.

How do fish breathe with gills?

Water is taken in at the mouth, flows across the gill filaments and exits beneath the operculum. Blood in the filaments flows in the opposite direction to the water, which keeps a concentration gradient along the whole gill and lets fish extract most of the dissolved oxygen.

What does the lateral line do?

The lateral line is a row of pores along each flank leading into canals lined with sensory hair cells. It responds to vibrations and pressure changes in the water, so a fish can feel prey or predators moving close by, keep clear of obstacles and hold its place in a shoal.

Why does a fish heart have only two chambers?

Fish have a single circulation: blood passes from the heart to the gills, then around the body and back to the heart. One atrium and one ventricle are enough because blood passes through the heart only once per circuit.

How is a bony fish different from a cartilaginous fish?

Bony fishes have a skeleton of bone, an operculum over the gills, a swim bladder and usually overlapping scales. Cartilaginous fishes such as sharks have a skeleton of cartilage, separate gill slits, no swim bladder and tooth-like scales.

Last Updated: September 2026