### animal | vertebrate | fish:

Freshwater fish
* Some freshwater fish belong to families
  - taxonomic families
  - contain mercury
* Some freshwater fish feed on freshwater snails
* are a better choice because they're usually bred in captivity
  - also significant for the Chinese diet
  - hyperosmotic relative to the external water
  - hyperosmotic, or saltier than their environment
  - in a hypotonic environment
  - limited to eels, salmon, trout and Arctic char
  - very adaptable as a rule
* conserve salts by reabsorption of ions from the filtrate in the nephrons.
* differ physiologically from salt water fish in several respects.
* do best with practically no salt in their water.
* eating cyclops are the second intermediate host.
* exhibit a range in salinity tolerance.
* have highly efficient kidneys to excrete lots of water and little salt
  - larger kidneys than marine fishes
  - lower levels of trimethylamine N-oxide
* inhabit rivers.
* produce large eggs with a lot of yolk
  - volumes of dilute urine, which is low in salt
* pump salt in.
* release a continuous dilute ammonia to the surroundings.

### animal | vertebrate | fish:

Frogfish
* Many frogfishes can change their colour.
* Most frogfishs are located in water
  - change color
* Most frogfishs have dark spots
  - large dark spots
  - mouths
  - teeth
* Most frogfishs prefer shallow water
* Some frogfish can also blow themselves, such as puffer, by sucking in water in a threat display
  - frogfishs swallow prey
* also employ a chemical attractant.
* also have a small small white skin flap just above the mouth
  - skin flap or knob just above the mouth
* are fish
* bony fish
* eat crustaceans , other fish, and even each other.
* get their name from their grotesque, almost frog-like appearance.
* have a specially modified dorsal spine with a fleshy growth at the end
  - stocky appearance, atypical of fish
  - appearances
  - the capacity to change coloration and pigment pattern in few weeks
* includes brains
  - breasts
  - cell membranes
  - chest cavities
  - chests
  - corpi
  - cytoplasm
  - ears
  - faces
  - fish scales
  - fishbones
  - flippers
  - heads
  - nuclei
  - pedal extremities
  - plasma membranes
  - rib cages
  - sections
  - skulls
  - sperm
  - sterna
  - tail fins
  - vacuoles
  - vertebrate feet
  - yolks
* inhabit rocky and coral reefs, sea grass beds, pier pilings, and sand and mud bottoms.
* open mouths.
* want water.

Frozen fish
* are located in freezers.
* has less taste and mushier flesh.
* is solid with no freezer burns, discoloration, or ice crystals.

Game fish
* adhere to temperature changes much like politicians listen to latest polls.
  - rainbow, eastern brook, brown, and cutthroat trout, kokanee salmon, and whitefish
* hide among the palm kelp and rocky crevices.
* is fish
* vary from sporty rainbow trout to the everyday catfish
  - the sporty rainbow trout to the every-day channel catfish

### animal | vertebrate | fish:

Gar
* Most gars eat fish
  - game fish
* Most gars have fins
  - inhabit water
* Some gars have black spots
  - esophagi
  - travel from lakes and rivers through sewers to get to ponds
* are hardy fish
  - predaceous
  - slow growing fishes that are relatively long lived
  - some of the most primitive of the bony fish that hunt, kill, and eat other animals
* attack their prey from the side.
* can breathe both air and water, which is one of the reasons they are still around today
  - which is one of the reasons they have survived so long
  - hard, diamond-shaped scales and their long thin jaws have wicked, sharp teeth
  - cell membranes
  - cytoplasm
  - ears
  - faces
  - fish scales
  - flippers
  - skulls
  - vertebrate feet
* prefer quiet waters and are often found in shallow lakes.
* tend to be slow-moving fish except when striking at their prey.
* use the air bladder as an accessory lung.