Homework Help: Science: Biology:
by Farzana Kibria
The goldfish is a domesticated form of carassius auratus, a carp like fish. It is known as funa in Japan and is native to East Asia especially around China. Wild carassius auratus is colored usually olive or dark brown and is about 40 cm. It also weighs about 4.5 kg.
After, they found out that it can be also found in southern Canada. It actually originated from China during the time of the Song dynasty, then Japan and then t Europe. Goldfish are usually in bright colors like bright red, and gold. They are peaceful aquarium fish and lives in water temperatures 14 Celsius to 20 Celsius. Hatching happens faster in a bit warmer waters in 8 days. Goldfish are known to live more than 20 years.
All goldfish are born with 2 or more colors. There are also 2 or 3 pigments in a goldfish. The black contains melanophores, the yellow contains xanthophores, and the red contains erythrophores. There are 2 ornamental colors in goldfish which are metallic and calico.
There are many interesting parts in a goldfish. There are lots of fins in the gold fish. The anal fin is the fin just before the tail, and the tail is called the caudal fin too. Another one is the dorsal fin which is the single fin on top of the back, the pectoral fin which is the first forward pair of wings, and the pelvic fins which are the second ventral pair of wings. The top of the head is called the cranial. The scale is the skin of the goldfish. The fish has eyes, mouth, and nostrils also.
Goldfishes are mostly kept as pets. It eats fish food, zooplankton, and aquatic larval insects. Domesticated adult goldfish are about 14 inches. They do not live in salt water and their natural habitat is ponds and slow moving streams. The goldfish has a really bad memory span but it knows when to hide from predators and what to eat.
Gold Fish Respiration
Goldfish live in environments which oxygen is in relatively found than us .The density of water makes it difficult for us to move fluid back in forth in the respiratory organs like we do with our lungs. That is why goldfish and other aquatic animals have special adaptations to solve these types of problems
The goldfish, including other aquatic animals, have one way or flow-through respiratory system that pump water over their respiratory organs which is the gills they have. Gills are the respiratory organ of most aquatic animals that breathe water to obtain oxygen, consisting of a filamentous structure of vascular membranes across which dissolved gases are exchanged. Instead of pumping water into and out, the animals pump water in one opening out to another making something like a stream in the organ but the animals don’t use their energy to make it stop flowing then starting it on the opposite direction. Then, to make more gasses between the blood and water, it has an exchange system that exchanges maximal gas. In the respiratory system, the blood flows to the opposite direction of the water. The aqua tic animals are very sensitive to low levels of oxygen in blood but terrestrial animals are more sensitive to the levels of water.