Fish Characteristics and Classification

Extensions of the body containing thin-walled blood vessels that allow for easy absorption of oxygen.

Respiration

<p>Raising marine and freshwater fish in ponds and underwater cages.</p> Signup and view all the answers

<p>Protect fish from predators and parasites and reduce friction with the water.</p> Signup and view all the answers

<p>A streamlined body that is typically long and narrow.</p> Signup and view all the answers

<p>A balloon-like internal organ that helps fish adjust their buoyancy.</p> Signup and view all the answers

<p>A protective flap that covers the gills of fishes.</p> Signup and view all the answers

<p>Enables fish to detect gentle currents and vibrations in the water.</p> Signup and view all the answers

<p>Helps maintain balance.</p> Signup and view all the answers

<p>The tail of fishes.</p> Signup and view all the answers

<p>Helps keep the fish upright and moving in a straight line.</p> Signup and view all the answers

<p>Pelvic fins.</p> Signup and view all the answers

<p>Control the direction of movement.</p> Signup and view all the answers

<p>Jawless fish; the most primitive of the early fishes.</p> Signup and view all the answers

<p>Cells that light up for bioluminescence found on some fish.</p> Signup and view all the answers

<p>A tail with upper and lower lobes symmetrical.</p> Signup and view all the answers

<p>A tail with the upper lobe larger than the lower.</p> Signup and view all the answers

<p>A tail that tapers to a point without upturning.</p> Signup and view all the answers

<p>Cartilaginous scales that project from the surface with a spine extending posteriorly.</p> Signup and view all the answers

<p>Large diamond or rhomboid shaped scales that do not overlap.</p> Signup and view all the answers

<p>Thin, overlapping scales with a smooth posterior edge.</p> Signup and view all the answers

<p>Thin flexible and overlapping scales with tiny spines.</p> Signup and view all the answers

<p>Animals that warm themselves mainly by absorbing heat from their surroundings.</p> Signup and view all the answers

<p>Refers to animals whose eggs hatch outside the mother's body.</p> Signup and view all the answers

<p>Refers to animals whose young are born alive after developing in eggs inside the mother's body.</p> Signup and view all the answers

<p>Method of reproduction in fishes where a large number of eggs are fertilized outside of the body.</p> Signup and view all the answers

<p>Keeping eggs and/or larvae in the mouth for protection.</p> Signup and view all the answers

<p>The larva eventually changes into the adult form of the organism.</p> Signup and view all the answers

<p>Very primitive jawless fish.</p> Signup and view all the answers