This is not true in
the case of fish. They consume the vegetation that grows in lakes,
streams, and the ocean, as well as various kinds of insects, small fish,
etc., which cannot be used as human food and which do not require the
use of the soil. In addition, much of the food that animals, which are
warm-blooded, take into their bodies is required to maintain a constant
temperature above that of their surroundings, so that not all of what
they eat is used in building up the tissues of their bodies. With fish,
however, it is different. As they are cold-blooded and actually receive
heat from their surroundings, they do not require food for bodily
warmth. Practically all that they take into the body is built up into a
supply of flesh that may be used as food for human beings.
3. With fish, as with other foods, some varieties are sought more than
others, the popularity of certain kinds depending on the individual
taste or the preference of the people in a particular locality. Such
popularity, however, is often a disadvantage to the purchaser, because a
large demand for certain varieties has a tendency to cause a rise in
price. The increased price does not indicate that the fish is of more
value to the consumer than some other fish that may be cheaper because
it is less popular, although quite as valuable from a food standpoint.
The preference for particular kinds of fish and the persistent disregard
of others that are edible is for the most part due to prejudice.
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