FOODSTUFFS OF NATURAL ORIGIN
It is possible to buy freeze-dried food items - small animals, shrimps, worms,
or plankton - in which the water content has been greatly reduced so that they can
be preserved more effectively. This treatment does clearly make them expensive,
but they are at least as nourishing as flakes and very popular with fish. They must
be stored in a dry place. Feed them to the fish according to the manufacturer's
directions and do not exceed the quantities recommended.
Frozen food: crab and phytoplankton.
Frozen products - shrimps, fish, worms, and plankton - can also be used, once
they have been separated and rinsed. They have a very high nutritional value, as
freezing does not modify their composition. They are obviously stored in the freezer
and must not be refrozen after thawing, in order to reduce the risk of microbial
contamination. They are more expensive than freeze-dried foodstuffs.
Cubes of freeze-dried tubifex worms.
Beef heart, similarly freeze-dried.
Domestic food items
Finally, domestic food can be provided fresh or after freezing and thawing. It
is best to avoid red meats as they have too much fat. Beef heart, rich in both blood
and lipids, can only be given only to large fish. White meats are preferable: chicken,
turkey, or ham. As for seafood, white fish can be used - although it must be handled
with care, as it can break up in the water - as well as mussels, cockles, and shrimps,
which can be bought preserved naturally. Vegetables are sometimes needed for herbivorous
fish: lettuce or spinach that has been blanched, i.e. out into boiling water for
a few minutes.
A Freeze-dried shrimps.