Name three ways boney fish are different that cartilaginous fish.
1.Swim bladder, 2.terminal mouth, 3.bones, 4.larger scales (cycloid), 5.fins are boney spines covered in a membrane 6.operculum
What are denticles?
placoid scales made from the same material as teeth, and are covered with enamel.
Explain the difference between 1.oviparous, 2.ovoviviparous, 3.viviporous.
1.Eggs are hatched outside the body 2.Eggs hatched inside the females body,live birth3.Young obtain their nutrition directly from the mother, live birth
What body shape do slow moving reef swimmers have?
box shaped, clown fish, angel fish
Why do bony fish have an Operculum?
it closes while water is let into the gills through the mouth, preventing back flow, ensuring the counter current system of the gills
name the four types of coloration in fishes and what they are used for.
name the sensory organs in a cartilaginous fish and what they sense. (4)
1. Eyes-light, 2.nostrils –smells, 3.lateral line- vibrations in the water, 4 ampulla of Lorenzinii – small electrical currents.
What is anadromous behavior?
A life cycle in which the creatures are hatched in fresh water and migrate to salt water when adults and return to fresh water to reproduce
What are A, B, C, and D?
a, nare b, spiracle, c, lateral line d, dorsal fin
What class are Chimaeras in?
Chondrichthyes, cartilaginous fish.
What are dental plates, what fish has them and why?
They are hard calcified plates in the mouth. Rays have them instead of teeth, they suction their food into their mouth and crush the hard shells with them
What 3 characteristics might you see in a demersal fish?
They are flat,so they can move across the bottom, their mouths are on the ventral side, their eyes are on the dorsal side,
Which lobe of the brain is oversized in a fish?
Olfactory lobe (smelling)
What are e, f, g, h, and i?
e,caudal fin f, anal fin g. pelvic fin h, pectoral fin i,gill slits
What do fish in the Agnatha class, lack? Can you name 4 structures?
Jaws, also called Jawless fish Also paired fins, scales and true bones
What do gill rakers do?
In filter feeding fish they catch the plankton the fish eats, in other fish they prevent bits of food from getting in the gills.
What are chromatophores?
suface pigment cells that expand and contract to create various colors
Describe the counter current blow flow system and why is it beneficial?
blood in the gills flows in the opposite direction to that of the oxygenated water. It allows for diffusion over a long area