a situation in which an animal has the reproduction organs of both sexes. This does not necessarily imply asexual reproduction
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15
name the four types of coloration in fishes and what they are used for.
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15
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
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15
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
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15
What characteristics do Rays have in common?
The are flat,(camouflage, easy movement across the bottom) their mouths are on their ventral side (convenient feeding), eyes are on their dorsal side.
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trap
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baam
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15
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
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15
How are rays and skates reproduction different?
Skates lay eggs,(oviparous) rays have live young (viviparous)
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15
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
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thief
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rocket
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lifesaver
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magnet
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rocket
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thief
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15
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.
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15
name the sensory organs in a cartilaginous fish and what they sense. (4)
1. Eyes-light, 2.nostrils โsmells, 3.lateral line- vibrations in the water, 4 ampulla of Lorenzinii โ small electrical currents.
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15
What are myomeres?
Bands of muscle along the side of fishes that is used for locomotion.
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15
What are chromatophores?
suface pigment cells that expand and contract to create various colors
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15
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