External and Internal Anatomy of the Rainbow Trout

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dorsal fin
keep fish upright, balance

pectoral fin
steer/stop, homologous to fore limbs

caudal fin
locomotion, forward drive

anal fin
balance

pelvic fin
keep fish upright, homologous to hind limbs

adipose fin
not fatty, function not know

spines
hard, pointed, unsegmented, unbranched, solid

soft rays
soft, not pointed, segmented, usually branched, bilateral, left & right halves

superior mouth position
swim near water’s surface, feed on items at surface

terminal mouth position
swim in water column, feed on other fishes or zooplankton

inferior mouth position
feed on algae or benthic organisms

gills
primary site of oxygen uptake from water, excretion of waste products, assistance in osmoregulation through chloride cells

each gill
has several gill rakers to protect gill filaments from clogging

mucus layer
secreted from epidermal mucous cells, protects body against parasites/bacteria

scales
along lateral line have pores, below are sensory organs which have sensory hairs which pick up vibrations in water so fish can hear objects

digestive system
esophagus, stomach, pyloric caecae, spleen, liver, gall bladder, intestine

gas bladder
hydrostatic organ that helps control buoyancy

excretory system
kidneys – excretion and osmoregulation, each kidney passes kidney duct to urinary bladder

cardiovascular system
respiration, osmoregulation, and digestion – carries respiratory gases, wastes, excretory metabolites, minerals, and nutrients

heart
4 chambers in series – sinus venosus, atrium, ventricle, bulbus asteriosus

reproductive system
testes contain sperm in males, ovaries contain eggs in females

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Dorsal fin Top fin, functions in maintaining balance Caudal fin Tail fin, used to propel fish through water WE …

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We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Brook Trout What kind of fish is above? Rainbow Trout What kind of fish is above? WE WILL WRITE …

We use cookies to give you the best experience possible. By continuing we’ll assume you’re on board with our cookie policy Central Disc The center part of the animal Arms or Rays. Protrude from disc. help sea star to move …

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