Download Fishes[1].

Andrea Carrasquero
Michelle Perez
Fishes
 A fish is any aquatic vertebrate
animal that is covered with
scales, and equipped with two
sets of paired fins and several
unpaired fins.
 Most fish are "cold-blooded," or
exothermic, allowing their
body temperatures to vary as
ambient temperatures change.
Fish are abundant in most
bodies of water.
 They can be found in nearly all
aquatic environments, from
high mountain streams to the
abyssal depths of the deepest
ocean.
 At 31,500 species, fish exhibit
greater species diversity than
any other class of vertebrates.
Types of Organism
Freshwater
Fish
Marine Fish
Tropical Fish
Freshwater Fish
 Freshwater fish are fish that spend some or all of their lives in
freshwater, such as rivers and lakes, with a salinity of less than
0.05%.
 These environments differ from marine conditions in many
ways, the most obvious being the difference in levels of salinity.
 To survive fresh water, the fish need a range of physiological
adaptations in order to keep the ion concentration of their
bodies balanced. 41% of all known species of fish are found in
freshwater
Marine Fish
 Marine biology is the study of life in the oceans and
other saltwater environments such as estuaries and
wetlands.
Tropical Fish
 Tropical fish include fish found in tropical
environments around the world, including both
freshwater and salt water species. Fish keepers
often use the term tropical fish to refer only those
requiring fresh water, with saltwater tropical fish
referred to as marine fish.
Reproduction
 Fish breed in different ways. There are two main
strategies that fish use: egg laying and live bearing.
Live bearing female fish are internally fertilized by the
male fish, and carry the fry for about a month before
delivering them. Egglaying fish lay eggs instead of
giving birth to little fish.
 Egg layers have many methods of laying eggs. For
example, substrate spawners lay eggs in protected
areas such as plants, rocks, wood. Mouth brooders
actually keep their eggs in their mouths until the eggs
hatch.
Fish Structure
 Fish are aquatic
animals. They are part
of the aquarium
ecosystem. Like all
animals fish eat,
breathe, reproduce,
excrete waste and
adapt to their
environment.
Different kinds of fish
reproduce in different
ways, and eat
different kinds of
food.