Fish hearts have 2 main chambers: the atrium and the ventricle. Fish have the simplest hearts of all the vertebrates.
A fish's heart have Two chambers .
A fish heart has two chamber and a mammal has 4.
conus arteriosus
Most fish have only two heart chambers.Amphibians and some types of primitive fish have four heart chambers, and the fourth one of these is known as the conus arteriosus.
A fish has four chambered heart. Chambers are as follows . 1 , Sinus venosis , 2 ,Atrium 3 ,ventrical 4 , conus arteriosis or bulbous arteriosis .
Fish hearts don't have four chambers.
4
Two
four chambers
Dolphins have a four-chambered heart.
The fox has a 4 chambered heart.
The heart of a lamprey looks similar to that of modern fish in a sense. It is a two chambered heart with a single atrium and a single ventricle. The atrium of the heart is proceeded by a sinus venosus, which isn't considered an actual chamber but rather pre-heart chamber. Then after the ventricle we have a conus arteriosus that again isn't considered to be a chamber of the heart but rather a post-heart chamber. The blood flow through the heart is a one way path like that of modern day fishes.