Fishes
Characteristics of agnatha
jawless, no scales
Fish swim in schools to avoid _______________
predators
Food is processed in fingerlike pouches called
pyloric ceca
Fish whose eggs hatch outside the mother's body are called _________________
oviparous
What jawless fish secretes incredible amounts of slime?
hagfish
Characteristics of chondrichthyes
flexible skeleton made of cartilage, hinged jaws, scales, paired fins
Fresh water fish tend to ______ water, whereas saltwater fish tend to _______ water.
1.) gain 2.) lose
What are the three groups of fishes?
1.) jawless 2.) bony 3.)cartilagenous
4 major characteristics of a fish include:
1.) two-chambered heart 2.) oxygen is extracted through gills capillaries 3.) sexual reproduction; external fertilization 4.) many offspring are produced, but little if any parental care is provided by parents
The 3 classes of fish are:
1.) agnatha (jawless fish) 2.) chondrichthyes (cartilaginous fish) 3.) osteichthyes (bony fish)
Two major groups of fish survive today, one group has a skeleton made of ______________, the other has a skeleton made of __________ _________.
1.) cartilage 2.) true bone
Which period is called "Age of fishes"
Devonian period
Fishes are ________ vertebrates; most fishes have paired fins, scales, and gills.
aquatic
Name a shark that is a filter feeder
basking
Paired fins gave fish more control over _________ _____________.
body movement
Osteichthyes means __________ ________
bony fish
characteristics of osteichthyes
bony skeleton composed of calcium compounds
The purpose of the swim-bladder is to regulate ________________
buoyancy
The skeleton of a shark is made up of ____________
cartilage
What type of fish have no scales?
catfish
To what CLASS do sharks belong?
chrondrichthyes
Jaws allow fish to do what?
eat a wider variety of food
What fish travels to saltwater to breed?
european eal
Gills are made of feathery structures called __________
filaments
What two features were important developments during the evolution of fishes?
jaws and paired fins
____________ are excretory organs that filter wastes from the blood
kidneys
examples of agnatha
lamprey and hagfish
Name a parasitic fish:
lampreys
What are two classes of jawless fish?
lampreys and hagfish
What three fish migrate to fresh water to breed?
lampreys, salmon, sturgeons
The two major groups of fish in Class Osteichthyes are the:
lobe finned fish and the ray finned fish
The lobe-finned fishes include the coelacanth and the __________
lung fishes
The gill cover that pumps water over the gills is called the _________________
operculum
What structure covers and protects the gills?
operculum
To what CLASS do bony fish belong
osterichthyes
Fish whose eggs stay within the mother are called ________________
ovvoviviparous
examples of chandrichthyes
sharks and rays
Name a species of fish where the young are "born alive"
sharks, guppies (viviparous)
Fish have ________ loop circulation
single
What structure keeps a fish from sinking?
swim blatter
Some examples of ray-finned fish include:
trout, tuna, bass, salmon
What are two chambers in a fishes heart?
ventricle, atrium
Do fish have a sense of smell?
yes
