Marine final exam - finding the difference Flashcards
(15 cards)
what is the name of their classification class?
sharks: condrycthes
fish: osteichthyes
what is their endoskeleton made of?
shark: cartilage
fish: bone
both have scales, but how does their surface covering differ?
shark: placoid or dermal denticle (sandpaper + hydrodynamic)
->
fish: ctenoid
C
how do their fins differ
sharks: heterocercal
fish: homocercal
how do their body shapes differ
sharks: torpedo, flattened
fish: laterally compressed, irregular eel-like (shape varies a lot)
how do their tails differ
sharks: heterocercal (different sizes)
fish: homocercal (same size)
how do their mouths differ
sharks: ventral
fish: anterior
how do they adjust to buoyancy? how do they avoid sinking
sharks: pectoral fins, liver-oil, cartilaginous skeleton
fish: swim bladder
how does the coloration of the sharks differ from many tropical reef fish
sharks: countershading (one side is darker than the other)
fish: chromatophores
how do their methods of swimming differ?
sharks: constant swimming
fish: leisurely
how do their livers differ
sharks: larger
fish: smaller
how do their methods of eating differ
sharks: all carnivores (shake and attack)
fish: omnivores
how do their intestine differ
sharks: spiral valve
fish: no spiral valve
both have closed circulatory system with counter-current blood flow through their gills, but how do their gills differ
sharks: gill slits
fish: gill flap/ operculum
the nervous system of sharks and fish differ in their ability to sense their surroundings, how do their sensory structures differ?
sharks: lateral line, ampullae of Lorenzini (detect electrical impulses in the water)
fish: lateral line
