Last update: November 14, 2022

75+ Popular Fish That Start With I

Did you know that there are more than 30,000 different species of fish that have been discovered so far? As more species are discovered, there is a very good chance that this number will increase.

We compiled a list of seven of our favorite and popular fish that start with I that might be a perfect fit for you tank. Each of these fish, like the others, has a name that begins with the letter I. There are also around seventy-five well-known fish whose names begin with the letter I.

It’s possible that you’re familiar with some of them, while others are so out of the usual that I really doubt you’ve ever heard of them before.

Since, let’s face it, very few people use the scientific names of animals when they go to the pet shop, we will refer to them by their more popular names.

I have included the scientific names for those of you who are more interested in that particular aspect of the subject matter.

Here is a list of 7 popular fish that start with I

Other interesting posts:

1. Indian Glassfish (Parambassis ranga)

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The Parambassis ranga is a type of tropical freshwater fish that only lives in India and Bangladesh. Most of the time, this fish is called the Indian Glassfish.

It has a body that is completely clear, and at its longest point, it can be about 10 centimeters (four inches) long. Because they are clear, it is hard for predators to find them and eat them, which could cause the population to grow.

2. Iridescent Shark (Pangasius hypophthalmus)

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The Iridescent Shark is a species of freshwater fish that is indigenous to Southeast Asia. It is also known by the scientific name Pangasius hypophthalmus.

This species, which belongs to the family of catfishes and may reach a length of more than three feet when fully grown, has one of the most frequent fish names.

Iridescent Sharks are easily identifiable by their long, flowing fins and iridescent scales that are silver in color. It is also utilized in traditional Chinese medicine, in addition to being a popular pet fish kept in aquariums.

Iridescent Sharks are omnivores, and the algae, worms, and tiny crustaceans that make up their diet are all staples. It is a tough fish that is capable of living for up to 15 years in captivity.

It is important to choose tank mates with caution since the Iridescent Shark may become aggressive if it feels threatened by other fish in the tank. Despite the fact that this fish does not attack other fish, its name may give the impression that it does.

Because it needs a big tank and consistent maintenance, it is not suggested for those who are just starting out.

3. Indian Spiny Loach (Lepidocephalichthys thermalis)

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The Indian Spiny Loach, scientifically known as Lepidocephalichthys thermalis, is a species of fish that is exclusive to India and Nepal.

It belongs to the family Cobitidae, which also includes the clown loach and the weather loach, amongst other species. It is entirely dark in color and has fins that are coated with spines. Its longest dimension is around 15 centimeters (6 inches).

It relies on its acute sense of smell to detect and swallow the very minute invertebrates that make up the bulk of its meal. These invertebrates are consumed thanks to this ability.

The Indian Spiny Loach is a well-liked aquarium fish that is often kept in community aquariums together with other fish of a more subdued nature. “Fish communities” is the common name for these aquariums.

When it senses that it is in danger, it may become fearful and secretive, remaining hidden for lengthy periods of time.

4. Icefish (Chionodraco hamatus)

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Icefish are a unique kind of fish that are only found in the very cold waters of the Antarctic. They are the only known vertebrates that do not have red blood cells, and as a consequence, they do not have any coloration and seem transparent.

The blood of icefish contains antifreeze proteins, which enable them to survive the subzero temperatures that prevail in their natural environment.

This is another one of the icefish’s distinguishing characteristics. These proteins attach to ice crystals, which stops the growth of the crystals over time.

Icefish are not hostile organisms and do not provide any danger to human beings, despite the peculiar appearance of their bodies. In point of fact, those fortunate enough to have tried them typically regard them as a culinary treat of the highest kind.

5. Indian mackerels (Rastrelliger)

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The name “mackerel” is used to describe several different species of sleek, fast-swimming food and sport fish that may be found in temperate and tropical waters across the world.

Mackerel are members of the family Scombridae, which also includes tunas. Mackerel have a torpedo-shaped body, narrow keeled tail base, forked tail, and a row of small finlets behind the dorsal and anal fins.

Both temperate and tropical seas are home to mackerel populations. As carnivores, they feed on various organisms as well as their own kind, including plankton, crabs, mollusks, fish eggs, and juvenile fish.

Schools of these fish move fiercely in the upper 25 to 30 feet of the ocean during the warmer months.

The colder months see them relocating to depths of up to 100 fathoms deeper in the ocean. They go to the coasts in the spring and early summer to breed. Their eggs are around 1 millimeter (0.04 inch) in diameter, are buoyant, and may float at depths of five fathoms or more in the sea.

To capture mackerel, nets are often used instead of hooks.

6. Ice Blue Red Top Zebra (Metriaclima greshakei)

There is a kind of fish that can only be found in Africa’s Lake Malawi that is referred to as the Ice Blue Red Top Zebra (Metriaclima greshakei).

Because of its bright blue and red coloring, the fish is quite simple to recognize. This is due to the fact that it has a striped pattern.

The fish is not very aggressive and may live in an aquarium with other types of fish without causing any problems.

However, due to the fact that it may reach a length of up to 8 inches, the fish must be kept in a tank that is rather big. In general, they are a stunning kind of fish that can withstand adversity and are a welcome addition to any freshwater aquarium.

7. Inexpectatum Pleco (Hypoptopoma inexpectatum)

This particular type of fish is native to the freshwater settings of South American countries. Another popular name for fish is pleco, which really refers to a kind of fish that is a member of the family Loricariidae and is more well known as an armored catfish.

It has a long body and a huge head that is elongated and flattened, and the skin of its body is coated in thin plates of bone. Additionally, its body is covered with plates of bone that run down its length. The odd look it had led to the naming of this creature.

The length of an adult Inexpectatum Pleco will often range between 4.5 and 5 inches, according to most accounts (10-12 cm). This fish does not cause any problems for the other animals that live in the aquarium, and it performs well when housed in settings with other fish.

Due to the fact that this species lives at the very bottom of the tank, it does not need any supplemental food or water. In addition to that, it will consume algae, detritus, and maybe even some very tiny insects.

Freshwater Fish

1. Ide (Leuciscus idus)

2. Ilisha (Tenualosa ilisha)

3. Inanga (Galaxias maculatus)

4. Inconnu (Stenodus nelma)

5. Indian Spiny Loach (Lepidocephalichthys thermalis)

6. Inexpectatum Pleco (Hypoptopoma inexpectatum)

7. Impostor goby (Gobius)

8. Incomati suckermouth (Chiloglanis bifurcus)

9. Indawgyi stream catfish (Akysis prashadi Hora)

10. Island frogfish (Antennarius bermudensis)

11. Island major (Abudefduf saxatilis

12. Island frillfin (Bathygobius mystacium)

13. Island boxfish (Ostracion cubicus Linnaeus)

14. Island hogfish (Lachnolaimus maximus)

15. Island kelpfish (Alloclinus holderi)

16. Island goby (Neogobius melanostomus)

17. Island gregory (Plectroglyphidodon insularis)

18. Island gudgeon (Bostrichthys aruensis)

19. Imspringer (O. oreotragus)

20. Imposter fangblenny (Plagiotremus phenax)

Saltwater Fish

1. Icefish (Chionodraco hamatus)

2. Indifferent eel (Ethadophis akkistikos)

3. Indian anchovy (Stolephorus indicus)

4. Indian ariomma (Ariomma indica)

5. Indian butter-catfish (Ompok bimaculatus)

6. Indian carplet (Amblypharyngodon microlepis)

7. Idiotfish (Sebastolobus alascanus)

8. Indo-pacific blue marlin (Makaira mazara)

9. Indo-pacific boarfish (Antigonia rubescens)

10. Indo-pacific boarfish (Antigonia rubescens)

11. Indonesia speckled carpetshark (Hemiscyllium freycineti)

12. Indonesian doubles cardinalfish (Diadema setosum)

13. Indonesian featherback (Chitala lopis)

14. Indonesian gizzard shad (Anodontostoma selangkat)

15. Indonesian goby (Glossogobius hoesei)

16. Indonesian leaffish (Pristolepis grootii)

17. Indonesian longfinned eel (Anguilla malgumora)

18. Indonesian round skate (Rajella fyllae)

19. Indonesian sawtail (Prionurus chrysurus)

20. Indonesian shortfin eel (Anguilla bicolor)

21. Indonesian shortfin eel (Anguilla bicolor)

22. Indonesian shortsnout spurdog (Squalus hemipinnis)

23. Indonesian shovelnose ray (Aptychotrema timorensis)

24. Indonesian snapper (Lutjanus bitaeniatus)

25. Indonesian Speckled Catshark (Halaelurus maculosus)

Tropical Fish

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Indian electric ray

1. Indian butter-catfish (Ompok bimaculatus)

2. Indian anchovy (Stolephorus indicus)

3. Indian frogfish (Antennarius indicus)

4. Indian goatfish (Parupeneus indicus)

5. Indian deepwater dragonet (Callionymus carebares)

6. Indian damsel (Pomacentrus indicus)

7. Indian driftfish (Ariomma indica)

8. Indian golden-barred butterflyfish (Roa jayakari)

9. Indian glassy fish (Parambassis ranga)

10. Indian gagata (Gagata cenia)

11. Indian grunter (Pomadasys commersonnii)

12. Indian handfish (Halieutaea indica)

13. Indian hump head (Kurtus indicus)

14. Indian gold-ring bristle-tooth (Ctenochaetus truncatus)

15. Indian long tailed sand-eel (Baskin Ichthys deraniyagala)

16. Indian electric ray (Torpedo sinuspersici)

17. Indian butter-catfish (Ompok bimaculatus)

18. Indian blind catfish (Horaglanis krishnai)

19. Indonesian bamboo shark

20. Indonesian damsel

In conclusion

The task of figuring out the names of fish that start with the letter I may not be very challenging, but the labor of putting all of those names into a list was challenging. There is an almost uncountable amount of different fish whose names start with the letter I.

We really hope that you were able to utilize this website, which provides information on more than seventy-five common fish whose names start with the letter I, to assist you in your quest for the name of the fish that piqued your interest.

There are a significant number of fish whose names start with I that are not included on this list, which is by no means exhaustive. As human knowledge of the natural world expands, new species of fish are always coming to light thanks to scientific exploration.

On the other hand, because of the categorization system, it is now a great deal simpler to identify them and to put them in the appropriate category.

As a direct result of this, any new orders or classes of fish that are found, as well as any new orders or classes of fish that belong to the same family as the fish that are currently listed, will be sorted appropriately.

Your inquiry, on the other hand, would benefit much by beginning with the species list that was supplied. 

Ian Sterling

Ian Sterling, founder of, began his aquarium journey over 30 years ago, driven by a deep fascination for fish and their diverse personalities. His website,, is dedicated to making fishkeeping accessible and enjoyable, offering beginner-friendly guidance, expert insights, and a community for aquarists to connect and share experiences.

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