Phylum ChordataSubphylumVertebrataPhylum ChordataSubphylumVertebrata
Classes of FISHClasses of FISH
CLASS AGNATHACLASS AGNATHA
DISTINGUISHING CHARACTERISTICS DISTINGUISHING CHARACTERISTICS
NO JAWSNO JAWS
NO SCALESNO SCALES
NO PAIRED APPENDAGESNO PAIRED APPENDAGES
FEEDING AND DIGESTION(Lamprey = ectoparasite of fish)FEEDING AND DIGESTION(Lamprey = ectoparasite of fish)
Circular suckingmouth (no jaw)Circular suckingmouth (no jaw)
TeethTeeth
Rasping tongueRasping tongue
Cloaca = a singleopening for theremoval of urine, feces,and reproductive cellsfrom the body.Cloaca = a singleopening for theremoval of urine, feces,and reproductive cellsfrom the body.
LAMPREY
HAGFISH
CIRCULATIONCIRCULATION
Two chambered heartTwo chambered heart
1 Atrium + 1 Ventricle1 Atrium + 1 Ventricle
Single loop systemSingle loop system
EctothermicEctothermic
RESPIRATIONRESPIRATION
•Gills•Gills
*True of ALL fish*True of ALL fish
Nervous SystemNervous System
Smell = best senseSmell = best sense
poor visionpoor vision
Internal ears (no external openings)Internal ears (no external openings)
TouchTouch
TasteTaste
Muscular/SkeletalMuscular/Skeletal
Endoskeleton ofCartilageEndoskeleton ofCartilage
No paired appendages =No fins.No paired appendages =No fins.
ReproductionReproduction
External fertilization = eggand sperm unite in thewater.External fertilization = eggand sperm unite in thewater.
Oviparous = egg lacks ashell; Must stay in thewater or it will dry out.Oviparous = egg lacks ashell; Must stay in thewater or it will dry out.
Lamprey eggs and babyLamprey eggs and baby
Class ChondrichthyesClass Chondrichthyes
Examples = Sharks, Skates, RaysExamples = Sharks, Skates, Rays
Distinguishing CharacteristicsDistinguishing Characteristics
* Skin covered with tiny tooth-like scales = Placoid scales(made from the same material as theirteeth)* Skin covered with tiny tooth-like scales = Placoid scales(made from the same material as theirteeth)
Dogfish DenticlesDogfish Denticles
More placoid scalesMore placoid scales
FEEDING AND DIGESTIONFEEDING AND DIGESTION
Jaws present, no chewing offood.Jaws present, no chewing offood.
Rows of replacement teeth injawRows of replacement teeth injaw
Cloaca presentCloaca present
Shark StomachShark Stomach
Stomachcut open
Shark JawsShark Jaws
CirculationCirculation
Same as Agnatha Same as Agnatha
RespirationRespiration
GillsGills
Most sharks must swimcontinuously in order tomove water over the gills.Most sharks must swimcontinuously in order tomove water over the gills.
Nervous SystemNervous System
Smell = #1 sense.Smell = #1 sense.
TasteTaste
TouchTouch
Color visionColor vision
Internal earsInternal ears
6th Sense (addition to the 5basic senses)6th Sense (addition to the 5basic senses)
Lateral Line System = pitsalong side of body; detectsvibration in the waterLateral Line System = pitsalong side of body; detectsvibration in the water
Lateral LineLateral Line
7th Sense7th Sense
ElectroreceptionThe abitilyto detect the electricalimpulses given off by thenervous system of living things.Electroreception = The abitilyto detect the electricalimpulses given off by thenervous system of living things.
AmpoulesofLorenzini
Muscular/SkeletalMuscular/Skeletal
Endoskeleton of CartilageEndoskeleton of Cartilage
Paired appendages present=but do not move.Paired appendages present=but do not move.
ReproductionReproduction
Internal fertilization inmost sharksInternal fertilization inmost sharks
Some are oviparousSome are oviparous
Others are ovoviviparous orviviparousOthers are ovoviviparous orviviparous
Shark eggsShark eggs
Skate egg casesSkate egg cases
Viviparous SharkViviparous Shark
Other ExamplesOther Examples
SKATES AND RAYS
CLASS OSTEICHTHYES(Largest vertebrate class)CLASS OSTEICHTHYES(Largest vertebrate class)
Examples = salmon, trout,goldfish, tuna, bluegills, bass,clown fish, sea horse, eelExamples = salmon, trout,goldfish, tuna, bluegills, bass,clown fish, sea horse, eel
Distinguishing Characteristic:Distinguishing Characteristic:
•Skin covered with bone scales•Skin covered with bone scales
- scales grow with the fish - scales grow with the fish
Bony Fish ScalesBony Fish Scales
Feeding and DigestionFeeding and Digestion
Jaws present with 1 set ofteethJaws present with 1 set ofteeth
No chewing of foodNo chewing of food
Cloaca PresentCloaca Present
CirculationCirculation
Same as Agnatha andChondrichthyesSame as Agnatha andChondrichthyes
RespirationRespiration
Gills protected by a bonecovering = the Operculum =opens and closes to movewater over the gills even ifthe fish is not swimmingforward.Gills protected by a bonecovering = the Operculum =opens and closes to movewater over the gills even ifthe fish is not swimmingforward.
OperculumOperculum
OPERCULUM
OPERCULA
Nervous SystemNervous System
Smell = #1 senseSmell = #1 sense
TasteTaste
TouchTouch
Color visionColor vision
Internal ears = hearingInternal ears = hearing
Lateral line system presentLateral line system present
Muscular/SkeletalMuscular/Skeletal
Endoskeleton of boneEndoskeleton of bone
Pair pectoral and pelvic finscan move.Pair pectoral and pelvic finscan move.
ReproductionReproduction
External fertilization =referred to as “spawning”.External fertilization =referred to as “spawning”.
Most are oviparousMost are oviparous
Some are ovoviviparousSome are ovoviviparous
Fish EggsFish Eggs
Gravid Female FishGravid Female Fish
Egg Mass insidefemale
Other CharacteristicOther Characteristic
All have a SWIMBLADDER = an air filledchamber that is used tocontrol buoyancy in thewater = won’t sink if theystop swimming!All have a SWIMBLADDER = an air filledchamber that is used tocontrol buoyancy in thewater = won’t sink if theystop swimming!
Swim BladderSwim Bladder
