Fish are cold-blooded vertebrates. There skin is covered with a layer of protective mucus that is produced by glands in the
skin, and acts as a defense against disease and parasites. Fish have air bladders that aid them in buoyancy and helps them
go rise and dive. It is a common belief that cold fronts that bring a precipitous drop in barometric pressure, effects their
air bladder which makes them less active and less likely to bite. It should be noted however that right before the cold front
fish will feed aggressively in preparation for the approaching cold front. The most important part of the fish other than
its sense of smell or vision is the lateral line. This sensory line runs the length of the body on both sides. The lateral
lines help the fish detect vibrations, such as from a disturbance in the water(you on the shore being loud) or a wounded baitfish.
The lateral line also detects changes in pressure. Fish continue to grow throughout their lives, but the growth rate is
variable and depends on many environmental factors. The most influential factors are genetics, food supply, water temperature
and oxygen in the water. At the beginning of their lives this growth is usually rapid and slows over time.
Vison : Fish eyes are similarly structured to human eyes and can detect color much like we do. Their perception is affected
by water depth and clarity and this can greatly shorten their range of sight in stained or muddy water.
Taste : Taste buds are not only on the mouth but can also be found on the lips, barbels, fins and snout. The importance
of taste varies in fish species, for catfish it is very important, but trout really are not concerned with it.
Smell : Smell is very important in aiding a fish to find food, migrate and to interact with others of their own species.
Their sense of smell is much more developed than land animal. Fish have nares, that are located between the mouth and eyes
that contain olfactory organs that enable them to smell.
Touch : One important and unique aspect of this sense is the lateral lines located on both sides of the body. They contain
sensory pores that detect vibrations and changes in pressure. This sense helps the fish locate food or escape before becoming
Hearing : Fish do not have visible ears (External or Middle) like we do. Instead, because fish are slightly denser than
the surrounding water, vibrations can easily reach the inner ear bones which allows them to sense vibrations and sounds at
nearly the same frequencies that we do.
Most fish lay eggs, and can deposit them in nests, like sunfish do. Or they can make nests out of gravel beds, or near
submerged logs. Some fish will abandon the nest sight while others like largemouth bass will aggressively guard them. Some
fish like shad will disperse buoyant floating eggs in flowing water. Others will release eggs that sink and that will adhere
to plants and rocks, and others still will incubate the eggs in their mouths or gill cavities until they hatch.