Freshwater

Lionhead (Carassius auratus)
Lionheads resemble a lion in color, have a head growth like a lion’s mane, and
have thick bodies These are slow-moving fish (because they have no dorsal
fin) that need very good water conditions in order to avoid disease.
Aquarium conditions are similar to those of the black moor. This fish comes
in many colors including orange, white, blue, and black and calico mixtures.
The lionhead can growth to lengths of 10 inches and like other large goldfish
requires a lot of tank space to remain healthy and happy.
Bubble-eye goldfish (Carassius auratus)
The peaceful bubble-eye is one of the most amazing looking goldfish around.
Like the lionhead, it has no dorsal fin and wiggles to swim. As the name suggests,
this fish has huge fluid-filled bubble sacks beneath each eye. As the
fish gets older, the sacs grow larger and can become very heavy to the point
of slowing down their motion and keeping them near the bottom of the tank.
Because they spend a lot of their time near the substrate, make sure that all
gravel, rocks, and other aquarium decorations have smooth edges that won’t
damage their delicate eye sacks. This species also has to be kept with other
non-aggressive goldfish. The aquarium should be as large as possible so that
it has plenty of room to swim around without risking damaging its eyes on
things in the aquarium.
It is best to feed your bubble-eye goldfish sinking pellets so that they can
easily get their fair share of nutrition. Keep their water slightly warmer in the
70–75 degree F range.
Telescope-eye goldfish or dragon-eye goldfish (Carassius auratus)
This species of goldfish has round eyes that protrude outward more and
more as the first few months of development pass by. These eyes resemble
those of fictional dragons. The fish was first developed in the 16th century.
This gentle goldfish has been known to live up to 25 years in captivity.
This goldfish should be kept in water between 65–75 degrees F and should be
kept in as large a tank as possible.
Coldwater invertebrates
Chapter 8: Finding Your Species
As you have learned, some invertebrates live in tropical tanks. There is also
one fairly common species that enjoys living in coldwater aquariums.
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