10 Blue Coloured Fish
Let's admit it, we all like bright coloured fish. Colours arouse emotions, and their presence in aquariums is very soothing. That explains why some of us are interested in having home aquariums or even visiting public aquariums. Some even go further by snorkelling to get a feel of the real world of fish in a natural environment. All in all, fish are a great source of recreation for human beings.
The colours in fish also have other functions—for example, recognition of species or even determining their sex. Sometimes, juveniles have different patterns of colours, which help differentiate them from their predators or sex competitors. Colours also help in blending with the environment, another technique to save from predators by taking shelter.
This article talks about 10 spectacular blue fish that you may enjoy. Don't forget to also watch the included videos to enhance your enjoyment!
1. Blue Ring Angelfish
Belonging to the Pomacanthidae family, the blue ring angelfish is stunning. Growing up to 45 cm, this fish can be recognised by the patterns it has on its body. The young ones have a bluish-black colour with curved white to blue bars which are narrow. But as it grows the pattern changes to semicircular marking in the middle with violet colouring.
Blue-ringed angelfish are found in the Indo-West Pacific, ranging from South Africa to north to Japan and south to Indonesia. They are found in singles or pairs in coral reefs and they feed on algae, fish, shrimps and corals. Initially, they are shy. So some hiding spaces in the tank are always required.
2. Blue Starfish
You can recognise a blue starfish by its five cylindrical arms with bright or light blue colour and yellow tube feet. The colour is from a pigment called linckiacyanin. The combination of pigments causes variation in colour shades.
The starfish is susceptible to temperature as well as oxygen levels. Growing up to 30 to 40 cm across, they have been found in coral reefs and seagrass beds of tropical waters of the Indian and Pacific Oceans.
They act as scavengers and opportunistic predators and consume dead animals and small invertebrates.
3. Blue Ribbon Eel
With a beautiful thin body and high dorsal fins, the blue ribbon eel is active and elegant. They can live for about 20 years (not in captivity) and can grow up to one meter long.
Eels hide in rocks, reefs or even in sand and eat mainly fish or shrimp. Eels get a bad reputation because people commonly think they are showing anger or aggression when breathing with their mouths open.
They are also quite vulnerable in captivity. They tend to stop eating, resulting in death. However, this is all contingent upon the size of the tank, water flow and depth of the sand. Any of these factors may help in prolonging their lives in captivity.
4. Blue Siamese Fighting Fish (Betta)
One of the most popular freshwater aquarium fish, commonly called a betta fish, is originally from Southeast Asia. Formerly known as a siam fish, you could find these fish in paddy fields in Cambodia and Vietnam.
The name stems from the aggressiveness that males show to each other. It was also bred for fighting in Thailand for many centuries.
The betta fish is known for their brilliant colours and can breathe through a labyrinth in addition to gills, which facilitates survival in stagnated waters and limited oxygen. With an overall length of up to 7 cm, it can survive in warm water, between 25-30 degrees celsius. The fish is carnivorous and eats crustaceans, mosquito larvae and even larvae of other water-borne insects.
5. Map Pufferfish
The pufferfish family is another marine wonder. The map puffer is a fish full of unique patterns of lines. Specially noteworthy are the black lines around eyes. About 60-65 cms in length, the map puffer has a body covered with prickles.
With its presence throughout the Indo-West Pacific region, this, like others in the family, is deadly poisonous which acts as a deterrent to the predators. It is solitary, has four very strong teeth and survives on algae, sponges and invertebrates dwelling at the bottom.
6. Yellowtail Damselfish
The combination of a jewel-blue body and a yellow fading at the end makes the yellowtail damselfish gorgeous. This unique colour combination mixed with non-aggressive nature makes yellowtail blue damselfish a staple in home aquariums.
It is found in the western Pacific and lives in coral reefs and sheltered lagoons. Gaining a size of 7 cm, the fish is omnivorous and accepts all varieties of plankton, algae and fresh or frozen meaty food and vegetables.
7. Blue Jellyfish
The blue jellyfish is rather magical. It looks like it is changing shape as it moves in the water. Averaging in size between 10 to 20 cm, this jellyfish has four large wrinkled mouth arms. This jellyfish has the power to sting pray using its long hairy tentacles. However, it lacks specialised respiratory, digestive and central nervous systems.
They are found in the northeastern part of the Atlantic Ocean, including the North Sea. Most of the time, they can be found in shallow water, mainly from April to July. Easterly winds can bring them to the shore, creating problems for tourists in summer. In aquariums, they are a major attraction for tourists.
8. Yellowbar Angelfish
Known as one of the largest among the angelfish, the yellowbar reaches about 50 cm in length. The yellowbar angelfish has a characteristically large yellow blotch on its violet-blue body. Because of this yellow patch, this marine fish has acquired the name of half-moon angelfish or map angelfish, and many believe it replicates the African continent.
It lives in the coral and rocky areas and is found in the Persian Gulf, northwestern Indian Ocean and the Red Sea. It likes food like sponges, algae, shrimp and anemones. Some have this fish in home aquariums.
9. Powder Blue Tang
This tropical marine oval-shaped fish is also called the powder blue surgeon fish and is known for its distinctive colours. The dorsal and pectoral fins are bright yellow, and the face has blue-black marking, making it very colourful. Their mouth is small and pointed. It swims with its pectoral fins, and the crescent-shaped caudal fins add to its beauty. The whitish pelvic and anal fins make it multi-coloured.
They show territorial and solitary behaviour and require several tank hiding spots and swimming space. They are found in the Indian Ocean and western Pacific and inhabit island coral reefs. They are primarily herbivores and like algae and small growths in crevices. Fun fact, they are monogamous!
10. Dwarf Gourami
The dwarf gourami is a popular fish because of its translucent body structure. Also known as the Colisa lalia, this fish has either red or dark orange stripes and is very beautiful.
This fish originated from South Asia, though it is now widely distributed in aquariums. Averaging 4 to 5 cm in size, the males and females can be distinguished from each other by alternating diagonal stripes. Males have blue and red alternating diagonal stripes, and females have a silver colour. You can also tell by the dorsal fin, which is rounded or curved in females but is pointed in the case of males.
They are carnivorous and prefer algae-based or meaty foods, including shrimps.
Sukhdev Shukla (author) from Dehra Dun, India on October 12, 2013:
midget38, Thanks for stopping by. I am glad you liked the fish. Have a nice weekend.
Michelle Liew from Singapore on October 12, 2013:
We used to have marine fish.Absolutely beautiful!
Sukhdev Shukla (author) from Dehra Dun, India on October 08, 2013:
Eddy, I am glad you liked blue coloured fish. It gives a soothing feeling to watch fish move and play hide and seek. Thanks for the support also.
Eiddwen from Wales on October 08, 2013:
A brilliant hub; voted up and shared.