It is accurate to say that a fish has a more complex immune system than a jellyfish because a jellyfish don't have plasma or blood which makes it impossible for white blood cells to do their job to fight an infection.
Both the Fish and jellyfish live in an aquatic environment, which is very conducive to the transmission of disease bearing organisms. Fish therefore have a well-developed immune system which protects the fish from harmful infections or diseases.
The skin, lateral line, and gills of the fishes are the first line of defense against the pathogens. On the other hand, the jellyfish does not have plasma or blood in them which makes it impossible for white blood cells to do their job to fight an infection in order to protect the jellyfish.
Hence, the answer is given and explained above.
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