The Fish Guru

Fascinating Fish: Exploring the Unique Species Starting with I

Fish Names Starting with I:

to Fish Species

Fish are one of the most diverse groups of animals on earth, with an estimated 33,600 known species and new ones being discovered every year. From freshwater to saltwater, from tropical to cold environments, fish have adapted to thrive in almost every habitat imaginable.

In this article, we will explore fish names starting with the letter I, including an introduction to different species and some of the most popular and interesting ones.

to Fish Species

Fish are a fascinating group of animals with an incredible range of sizes, shapes, and colors. Some are solitary creatures, while others travel in schools or shoals.

Fish come in all shapes and sizes, from the tiny pygmy goby, which is only half an inch long, to the enormous whale shark, which can grow up to 40 feet in length. Fish have various body structures with different types of fins, gills, and scales, allowing them to swim and breathe underwater.

Fish species are also divided into two categories: bony fish and cartilaginous fish. Over the years, humans have discovered a vast array of fish species, and more are being discovered every year.

Around 500 new species of fish are discovered each year, indicating that there may be many more fish species on earth that we have yet to discover.

Popular Fish Names Starting with I

Indian Glassfish

The Indian Glassfish, also known as Parambassis ranga, originates from India and Bangladesh, inhabiting tropical freshwater environments. This transparent fish is characterized by its clear body, which makes it a popular choice for aquariums.

Indian Glassfish are peaceful by nature but can be challenging to breed, requiring precise water conditions.

Iridescent Shark


Iridescent Shark, also known as Pangasius hypophthalmus, has a unique appearance, reflecting the light with iridescent scales. It is a freshwater fish with silver-grey coloring and a long, streamlined body.

Native to the rivers of Southeast Asia, the

Iridescent Shark is an active swimmer, travelling in groups, and feeding on smaller fish. Due to its size, it requires a larger tank to thrive.

Indian Spiny Loach


Indian Spiny Loach, also known as the Cobitis taenia, is a small, freshwater fish native to India. This fish has a unique appearance with a long, slender body, and spiny dorsal fins.

It has an omnivorous diet and lives in waterways with a fast current. It is popular among aquarium enthusiasts due to its hardy nature and low maintenance.



Icefish, also known as Champsocephalus gunnari, is a species of white-blooded fish that lives in the Southern Ocean surrounding Antarctica. These fish have translucent skin and lack both hemoglobin and red blood cells, making them almost transparent.

Due to their unique physiology, they can survive in the frigid Antarctic waters where other fish cannot.

Indian Mackerels

Indian Mackerels, also commonly called the Rastrelliger kanagurta, are a species of saltwater fish that inhabit the tropical waters of the Indian Ocean. These fish have an elongated, streamlined body with a distinct greenish-blue back and silver belly.

Indian Mackerels usually feed on plankton and smaller fish, making them an important part of the marine ecosystem.

Ice Blue Red Top Zebra

Ice Blue Red Top Zebra, also known as the Metriaclima callainos, is a small, colorful freshwater fish that originates from lake Malawi in Africa. This fish is commonly known for its blue body and red top fin, and it requires a moderately sized tank to thrive.

It is popular among aquarium enthusiasts for its striking coloration and peaceful temperament.

Inexpectatum Pleco


Inexpectatum Pleco, also known as the Peckoltia inexpectata, is a small, freshwater fish that originates from the Maranon and Ucayali river basins in Peru. This fish has a unique appearance, with a brownish-black body, white spots, and bristly, armored plates along its body.

It is a peaceful species that is easy to care for and suitable for most aquariums.

Description and Habitat of Indian Glassfish

The Indian Glassfish, also called the Asian Glassfish, is a small, peaceful fish that grows up to three inches in length. It is commonly found in the tropical freshwater environments of India and Bangladesh, inhabiting rivers, canals, and ponds.

The Indian Glassfish gets its name from its transparent body, which makes it a popular choice for aquarium enthusiasts. Its clear body allows you to see the internal organs, bones, and even the food that it has consumed.

The Indian Glassfish has a streamlined body with a slightly curved forehead and a pointed snout. Its head is small in proportion to its body, and it has two dorsal fins, one larger than the other.

The Indian Glassfish has a yellowish green to olive-green coloring, which can vary slightly depending on its environment and diet. It is a relatively hardy species, and can tolerate a wide range of water conditions, making it an easy-to-care-for fish.

Predators and Population Growth of Indian Glassfish

In their native habitat, Indian Glassfish have various predators, including larger fish species and birds. A primary predator of the Indian Glassfish is the Snakehead fish, which is known for its ability to hunt its prey and withstand freshwater environments with low oxygen levels.

Due to overfishing and habitat loss, Indian Glassfish populations have declined in recent years. As a result, the Indian Glassfish is on the International Union for Conservation of Nature’s (IUCN) Red List as a near-threatened species.

Conservation efforts are underway to protect the Indian Glassfish and its habitat, including the creation of protected areas, restocking efforts, and the implementation of sustainable fishing practices.


Fish are fascinating creatures that come in all shapes and sizes, and we have explored some of the most popular and interesting fish names starting with the letter I. From transparent Indian Glassfish to the colorful

Ice Blue Red Top Zebra, each species has its unique characteristics that make it fascinating to observe.

By understanding their habitat, feeding habits, and potential threats, we can work to conserve these precious fish species for future generations to enjoy. 3)

Iridescent Shark (Pangasius hypophthalmus)

Description and Habitat


Iridescent Shark, also known as Pangasius hypophthalmus or Siamese shark, is a freshwater fish that originates from the Mekong River in Southeast Asia.

It is a member of the catfish family, known for its long fins and iridescent scales, which reflect the light and create a shimmering effect. The

Iridescent Shark has a streamlined, silver-grey body that can grow up to four feet in length.

In its natural habitat, the

Iridescent Shark inhabits large rivers and diverse freshwater ecosystems, including the Mekong and Chao Phraya Rivers in Thailand, Cambodia and Vietnam. This species typically prefers the areas with high flow and oxygen-rich water.


Iridescent Shark is not typically found in smaller water bodies such as ponds or lakes, although it might be present in large reservoirs.

Diet and Lifespan


Iridescent Shark is an omnivorous fish, feeding on a variety of different foods, such as algae, small fish, worms, and crustaceans. The young fish feed mainly on plankton and small organisms, while the adults prefer a diet of larger prey.

In captivity, they can be fed with a variety of pellet foods, as well as frozen or live foods. In the wild, the

Iridescent Shark can live up to 20 years or more.

In captivity, the lifespan of the

Iridescent Shark can vary, depending on the water quality, diet, and care provided. Generally, they can live up to 10-15 years in the proper conditions.


Indian Spiny Loach (Lepidocephalichthys thermalis)

Description and Habitat


Indian Spiny Loach, also known as Lepidocephalichthys thermalis, is a small freshwater fish with a dark color and spiny fins. This species is native to India, Nepal, and Sri Lanka, where they inhabit slow-moving rivers, wetlands, and streams.


Indian Spiny Loach belongs to the family Cobitidae, which is commonly referred to as loaches. The

Indian Spiny Loach has a unique appearance characterized by its small size, slim and elongated body, and spines on its dorsal and pectoral fins.

The body is typically brown to black in color, with white spots and an iridescent hue. These spots and the iridescence can vary depending on the water color and environment that the fish is in.

This species also has an acute sense of smell, which is necessary for finding prey and detecting predators in its natural habitat.

Aquarium Life and Behavior


Indian Spiny Loach is a popular fish species to keep in community aquariums, thanks to its small size and peaceful temperament. They typically do well in a densely planted aquarium with hiding places.

Providing different shaped rocks, caves or bogwood will serve as an ideal hiding space for them. A substrate that consists of smaller particle size and soft in texture is their preference.

Indian Spiny Loach can be kept with other community fishes like Tetras or Guppies and hence, they are perfect for beginner aquariums. It is important to note that the

Indian Spiny Loach can be somewhat shy and may spend a lot of time hiding or burrowing in the substrate.

Due to their secretive nature, they can be seen as a fearful fish, but with proper care, they can adapt and thrive in aquariums. In conclusion, both the

Iridescent Shark and the

Indian Spiny Loach are unique freshwater fish species with unique characteristics and behaviors.

Understanding the habitat, feeding habits, and behavior of these species can help educate and guide aquarium enthusiasts on keeping them as pets. They can make excellent additions to any community aquarium and provide a visually captivating experience.


Icefish (Chionodraco hamatus)

Description and Habitat


Icefish, also known as Chionodraco hamatus, is a species of bony fish that lives in the frigid waters surrounding Antarctica. It is a slender, torpedo-shaped fish, with a transparent body that lacks hemoglobin and red blood cells.

The transparent body of the

Icefish allows it to blend in with the surrounding water to avoid detection by predators. The lack of red blood cells means that oxygen is transported in the blood plasma, which is an adaptation for survival in the oxygen-poor Antarctic waters.

Furthermore, this species also produces a natural antifreeze protein, which enables them to survive in the frigid water temperatures.

Icefish prefer to live in shallow waters near the coast, where they feed on small crustaceans like krill, copepods and amphipods. This species can be found at depths up to 2000 feet in the water column, but their typical depth is at around 60 to 70 feet.

Perception and Consumption


Icefish is a non-hostile species that is not typically sought after by commercial fisheries. Antarctic regulations prohibit fishing in many areas, including those where the

Icefish is found, further limiting the species consumption.

However, some Antarctic communities have been known to consume the

Icefish as a culinary delicacy. The lack of hemoglobin in the

Icefishs blood gives this species a unique taste, described by some as mildly sweet.


Icefish, however, remains predominantly a lesser-known fish species that is unique for its adaptations in surviving the extreme Antarctic conditions. 6)

Indian Mackerels (Rastrelliger)

Description and Habitat

The Indian Mackerel, also known as Rastrelliger, is a species of fast-swimming, torpedo-shaped fish that inhabit tropical and temperate waters of the Indian and Pacific Oceans.

This species has a distinct greenish-blue back that turns into silver towards the belly, with a forked tail and sharp teeth to aid in feeding.

Indian Mackerels are carnivores and primarily feed on small fishes such as anchovies, sardines, and herring, along with crustaceans, mollusks, and fish eggs.

The Indian Mackerel typically spawns in warmer, coastal waters during the summer months, and migrates to deeper waters during the colder months. They travel in schools, and the adult fish often select a nesting ground to breed.

This schooling behavior reduces the chances of predation and improves breeding success.

Migration and Reproduction

The Indian Mackerel is a migratory species, with seasonal movements that depend on food availability and water temperature. During the summer months, they migrate towards the coasts to feed and breed, in search of spawning habitats.

The fish spawn at night, and the fertilized eggs flow to the surface of the water due to their low-density. These eggs hatch within 24 to 30 hours, releasing small predatory larvae that resemble adult fish.

As juveniles, the Indian Mackerel tends to stay close to the coast, while adult fish migrate to deeper waters. During this migration, the fish suffer from predation by larger predatory fishes, making swimming in schools critical for survival.

The migratory behavior of Indian Mackerel is essential for regulating the population, food chains, and overall ecosystem they inhabit. In conclusion, the

Icefish and the Indian Mackerel are two vastly different fish species in structure, behavior, and habitat.

From the unique adaptations of the

Icefish in enduring the icy waters of Antarctica to the migratory behavior of

Indian Mackerels, each species is fascinating in its own right. Understanding their lifestyle, diet, and breeding patterns can help aquarists care for them in an aquarium environment as well as help regulate commercial fishing.

These fish play a crucial role in balancing the ecosystem they thrive in, and by understanding their characteristics, we can work towards ensuring their populations remain abundant. 7)

Ice Blue Red Top Zebra (Metriaclima greshakei)

Description and Habitat


Ice Blue Red Top Zebra, or Metriaclima greshakei, is a freshwater fish that originates from Lake Malawi in Africa.

This fish is popular among aquarium enthusiasts for its bright blue coloration with red markings on the forehead and dorsal fin, as well as its unique striped pattern. The

Ice Blue Red Top Zebra belongs to the cichlid family and has a relatively peaceful temperament compared to its aggressive cichlid relatives.

In the wild, the

Ice Blue Red Top Zebra is found on sandy and rocky areas on the lake’s shores. They are generally found in shallow waters that are rich

Popular Posts