When comparing fish with the meat of terrestrial vertebrates it must always be taken into account that the water content of raw fish meat is much higher, so one pound of raw fish does not have the same nutritional value as one pound of raw chicken meat or beef meat.

If the fish is bought frozen, even more of the paid weight is water, so the water content would have to be accounted when comparing prices.

Fish may be much more expensive than it seems when just looking at the price tag, even 50% more expensive per protein content (raw poultry meat has about 25% protein content, while raw fish fillet has between 15% and 20% protein content).