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Anatomy of Fish
What makes a fish a fish?
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Things you will learn
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4.
Fish breathe through gills.
Fish have fins to help them swim.
Some fish can live in salt water.
Some fish can live in fresh water.
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5.
Only a few can live both.
Different adaptations of fish.
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Vocabulary
• External Anatomy - The outside body parts.
• Caudal/Tail Fin - Fin on end of fish; used to propel the fish.
• Dorsal Fin – Backside (top) fin on a fish; used for balance and protection.
• Pectoral Fin – Side (“chest”) fins on a fish; used for balance and steering.
• Anal Fin - Last bottom fin on a fish located near the anal opening; used for
balancing and steering.
• Pelvic Fin – Paired bottom or belly fins on a fish; used in balance and
steering.
• Gills - Organ a fish uses to obtain oxygen from the water.
• Operculum - Flexible bony plate that covers the gills.
• Lateral Line - Organ a fish uses to “feel” low vibrations; tiny microscopic
pores.
Vocabulary continued…
• Nares - Organ a fish uses to smell; similar to nostrils but not used for
breathing.
• Scales - Protective cover on a fish; similar to skin.
• Vertebrate - Organism with a backbone.
• Superior Mouth - A mouth that opens upward (usually surface feeders).
• Inferior Mouth - A mouth that opens downward (usually bottom feeders).
• Terminal Mouth - A mouth located at anterior end of fish’s body (mid water
feeder).
• Camouflage – The ability to blend in with the background or habitat.
• Adaptation - The adjustment or change in behavior or body to become
better suited for survival in a particular environment.
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Introduction

Over time fish have adapted or changed to survive in their
environment.

Different fish species have different appearances, the function
of their outside body parts is similar.

However, the outside body parts (external anatomy features) of
fish can tell us a lot about a species such as where it lives in
the water, how it finds food, and how it protects itself from
predators.
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How are fish classified?
Why do you think it’s important
to be able to identify fish?
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Anatomy of a fish
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How do fish swim?
Fish swim by moving their caudal fin
(back fin) left and right.
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Fins

All fish have external appendages called fins, fins provide fish with
balance, steering, and protection.
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Fins are either single along the centerline of the fish: the dorsal fin,
anal fin, and tail fin; or paired fins: the pectoral fins and ventral fins.

Pectoral fins help fish balance. The top fin or dorsal fin is also used in
balance but its main function is usually protection.

The ventral fin and anal fin are located on the bottom or belly of fish
and help with steering as well as balance.

The caudal fin helps propel fish forward.
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GO FISH
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How do Fish breathe in
the water?
* Water goes through the mouth and
goes out through the gills,which
take oxygen from the water.
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Gills

Located on either side of fish, gills provide oxygen
to fish from the water.

The gills are covered by a flexible bony plate
called the operculum. Some fish have spines
located on the operculum as a defense
mechanism to protect them from predators.
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Detection of food,
sound, direction
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Lateral Line
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Running down the length of a fish’s
body is the lateral line. This organ
is used to feel low vibrations in the
water.
The lateral line is made up of a
series of microscopic holes located
just under the scales of a fish.
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Sense of smell
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Nares
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Located on a fish’s snout are paired holes, or nares used for
detecting odors in the water.
The nares are made up of many capsules, each containing
receptors.
Water flows through the nares as the fish swims.Behind the
nares, in a chamber, are sensors (chemical receptors) that detect
chemicals that are dissolved in the water. Once an odor is
detected, the nerves send signals to the fish's brain that interpret
the smells. These smells might attract the fish or keep it at bay
depending on whether the fish interprets the smell to represent
food or danger.

Catfish and eels, have a heightened sense of smell.
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Protection of the body
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Scales
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Most fish have scales covering the length of their body.
Scales protect fish from injury
On top of these scales is a mucus covering known as
the slime layer.
 Slime protects fish from bacteria and parasites in the
water. Anglers should be careful
not to remove the slime layer when handling a fish
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Body Type

A fish’s body shape as well as the shape and
size of certain external features can tell you a lot
about that fish.

For example, the body shape of a fish can
indicate where that fish lives in the water and
what type of swimmer it is.
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Name that fish
1.
2.
3.
4.
5.
Mouth is door like, it has a combination of shapes.
List at least 2 characteristics of puffer fish.
Fast swimming, ultra stream lined, open water fishes.
Lack pelvic fins and are scale-less.
Arrow like body type, and are surface dwellers
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Mouth
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The mouth parts of a fish will vary in size and may or may not
contain teeth, depending on what the fish eats.
The location of the mouth on a fish’s body can also give us a
clue as to what the fish’s diet consists of.

A superior mouth (a mouth pointing upward) means the fish will
usually eat food located above it, whereas a fish with an inferior
mouth (a mouth pointing downward) will usually eat food located
below it.
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Form, Function & Adaptations
Fluke

Fluke or summer flounder is a flat-lying saltwater fish that lives on the
sea floor.
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When born, fluke look like any other fish, swimming upright. About a
week to a month into its life, one eye rotates to the other side of the
head to join the other eye. This adaptation allows fluke to lie flat on the
ocean floor and wait for its food; thus it is called a lie-and-wait predator.

Fluke also have many sharp teeth which allow it to eat smaller fish that
swim above it.
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Adaptations to Avoid Predation
Clingfishes- have modified pectoral fins to form a
powerful sucker used to secure itself to rocks.
Flyingfishes- avoid predation by enlarged pectoral fins
to glide through the air.
Pufferfishes- can swallow large amounts of air or water
to inflate their bodies to deter potential predators.
Puffer Fish are Dangerous!

http://www.youtube.com/watch?v=j
yIIbFZt0Aw

http://www.sciencekids.co.nz/video
s/animals/pufferfish.html

http://www.youtube.com/watch?v=
OkXhC7yzISI#t=29
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Largemouth Bass
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Largemouth bass live near the bottom of freshwater lakes, ponds,
and streams.
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Their greenish brown coloring blends well with the surrounding
aquatic vegetation which protects them from predators
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The teeth of a largemouth bass are brush-like with a texture of
sandpaper. Their teeth are suited for gripping, not tearing, and to
swallow prey whole. Adult largemouth bass can easily consume
smaller fish, frogs, and even baby ducks.
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Sea Robin

They are a bottom dwelling fish with very large pectoral fins which
make the sea robin look much larger to passing predators.
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As an additional defense against predators, sea robins have a very
sharp dorsal fin and spines on its gill covers.
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Sea robins can also make a barking or croaking sound that scare off
predators.
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Although the sea robin physically looks different than most other
species, its fins still help to balance its body, steer through the water,
and protect it against predators.
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Because of its odd external characteristics, many humans consider
the sea robin to be a trash fish, not suitable to eat, yet in fact it is fine
for human consumption.

http://www.youtube.com/watch?v=kfM7O3Xcmyc
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Betta Fish
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The betta got its name from an ancient clan of warriors, called the
"Bettah." The fish were given a combatant name after the fighting
fish became popular in the mid-1800s. In fact, the sport became so
renowned in Thailand that the former King of Siam had it regulated
and taxed! Spectators of the sport based their bets on the bravery of
the fish, rather than the damage inflicted by the victor.
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FACT: Betta’s can breath air! They have a unique organ called a
labyrinth that allows to breath air like you and me. This was critical to
their survival as they generally lived in low-oxygen water like rice
paddies and slow moving streams – conditions most other fish could
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not survive in
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..MORE BETA FISH
http://www.youtube.com/w
atch?v=saiCxypusbA
http://www.youtube.com/watch?v=
Rds3dxalsi4
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Gold Fish
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It was one of the earliest fish to
be domesticated, and is one of
the most commonly
kept aquarium fish.
Most common bought and kept
fish in households. WHY?
Can live to up to 40 YEARS!!
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http://www.bizarbin.com/biggestgoldfish-ever-caught/
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More characteristics:
Not all fish have bones
Many fish have bones, but the shark,
for example, has cartilage.
Let’s take a closer look at these two
types of fish.
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Shark VS. Bony Fish
SHARKS
BONY FISH
ATTRIBUTE
Skeleton
Cartilage only
Bones and cartilage
Swimming
Can only swim forward.
Can swim forwards and backwards
Buoyancy (floating)
Large oily liver
Gas-filled swim bladder
Gills
Gill slits but no gill cover
Covered gill slits
Reproduction
Eggs fertilized in female's body.
Eggs usually fertilized in the water.
Skin
Rough, sandpaper-like scales
Slippery, overlapping scales
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How do you think
fishermen determine
what type of fish they
want out to catch?
Activity:
GO FISH
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THE END.
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What have you learned?
1. What is the function of the dorsal fin?
2. What is the difference between an inferior and
superior mouth of a fish?
3. Where on a fish is the Caudal fin located?
4. What does the body type of a fish indicate?
5. What is an adaptation of the flounder fish?
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Fish
Anatomy
QUIZ!
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