In most fish the respiration takes place through gills since there under water there under water there gills are like are lungs .
respiratory system of gold fish
Internal Gills
gills which are their lungs
suck my dick
vascular system of star fish
yes it does LOL!
Humans must first dissolve the gasses in water (in the alveolii of the lungs) before we can extract it, whereas fish only can get the gasses already dissolved. Also - fish have a one-way respiratory system whereas humans have an in and out respiratory system.
Because a dolphin is a mammal, and not a fish. A dolphin's respiratory system is similar, for the most part, to a human's respiratory system.
gills
They both have organ system, respiratory system and excrete in a similar way
Most fish use gills for gas exchange instead of lungs
Most fish use gills for gas exchange instead of lungs