The Catla Fish Explained

The catla (Labeo catla) is a large, fast-growing freshwater carp of South Asia, one of the three Indian major carps, recognisable by its broad head, upturned mouth and habit of feeding near the water surface. It is a cornerstone of pond aquaculture in India and a favourite table fish in eastern states such as West Bengal, Odisha, Bihar and Assam.

The catla owes its commercial importance to its rapid growth, its suitability for mixed-species ponds and its popularity in the kitchen. This explainer covers how to identify the catla, where it lives, what it eats, how it is bred and farmed, why it is stocked together with rohu and mrigal, and what it means for Indian fisheries and food.

Key Takeaways

• The catla is one of the three Indian major carps and is distinguished by a large head, a wide upturned mouth and a surface-feeding habit.
• The catla grows faster than most other Indian carps and can reach roughly 1 to 1.5 kg in its first year in a well-managed pond.
• The catla feeds mainly on zooplankton in the upper layers of a pond, so it occupies a different niche from rohu and mrigal in polyculture.
• The catla and other Indian major carps were first bred by hormone-induced spawning in India in 1957, an event commemorated each year on National Fish Farmers’ Day on 10 July.
• The catla is a staple of eastern Indian cuisine, with its large head and rich flesh used in Bengali and Odia dishes.
• The catla is farmed across states such as West Bengal, Andhra Pradesh, Odisha, Bihar and Punjab, and carps account for the bulk of freshwater aquaculture production in India.

What is the catla fish?

The catla is a large freshwater carp, scientifically called Labeo catla, native to the rivers of the Indian subcontinent and widely farmed as one of the Indian major carps. It is a deep-bodied silver-grey fish with a very large head, no barbels and a broad, upturned mouth adapted for taking food from near the surface.

For many years the species was classified in its own genus as Catla catla, a name still found in older books and many fisheries documents. Modern classification places it in the genus Labeo, alongside rohu, though both names appear in India’s fisheries literature and in market trade.

The fish is known as katla in Bengali, bhakur in Odia and Hindi, and bocha or botcha in Telugu, among other regional names. These names may vary by district, and the same word is sometimes used loosely for other large carps.

How can you identify a catla?

A catla can be identified by its disproportionately large, broad head, its wide upturned mouth with a protruding lower jaw, its lack of barbels and its greyish back fading to a silvery white belly. The body is deep and laterally compressed, and the eyes sit relatively low on the sides of the head.

• Head: very broad and large, often about a quarter or more of the total body length in mature fish.
• Mouth: wide, upward-pointing, with thick lips; the fish gulps plankton near the surface.
• Barbels: absent, which separates it from several other carps.
• Colour: greyish or bluish on the back, silvery on the sides and belly; fins become darker with age.
• Size: large individuals in rivers have been reported at well over a metre in length and tens of kilograms, though most market fish weigh 1 to 5 kg.

Compared with rohu, the catla has a broader head and a more arched back, and rohu has a more streamlined body and a reddish tinge near the eyes. Fish traders often distinguish the two quickly by the head shape alone.

Where does the catla live?

The catla lives naturally in the rivers, floodplain lakes and large reservoirs of northern and eastern India and neighbouring countries, with the Ganga and Brahmaputra river systems as its core range. It prefers flowing or well-oxygenated, plankton-rich water and tends to stay in the upper layers.

The species spawns in rivers during the monsoon, when rising floodwater triggers breeding, and the eggs and young drift into floodplains that serve as nurseries. These natural habits explain why river regulation, dams, pollution and over-fishing have reduced wild stocks in some stretches.

Outside its native range the catla has been introduced into peninsular rivers and reservoirs in India and into several other Asian countries for aquaculture and stock enhancement. It thrives in ponds, tanks and reservoirs where plankton is abundant, and it is rarely found in cold, fast mountain streams.

What does the catla eat?

The catla eats mainly zooplankton, the tiny animal life drifting in the upper waters of a pond or river, and it also takes some phytoplankton, insects and decaying plant matter. Its large mouth and gill structure suit it for filtering and picking small food particles from the surface and upper column.

In farm ponds, fertilisation with organic manure or inorganic fertiliser boosts plankton growth, and this natural food forms the base of the fish’s diet. Fish farmers commonly supplement it with a mixture of rice bran and oilcake, which raises growth rates. The young stages, known as spawn, fry and fingerlings, feed on very small zooplankton before moving to larger forms.

Because the catla feeds high in the water, it competes little with rohu, which prefers the middle layers, or with mrigal, which feeds near the bottom. This division of feeding zones is the biological reason why the three species are stocked together.

How is the catla bred and farmed in India?

The catla is bred in India mainly through induced breeding, in which a hormone injection triggers spawning in captive brood fish, and its seed is then reared to fingerling size before stocking in grow-out ponds. The method was pioneered in India in 1957, when scientists at Cuttack in Odisha, notably Hiralal Chaudhuri and Alikunhi, succeeded in breeding Indian major carps by hypophysation, using extract from the pituitary gland.

That 1957 breakthrough is commemorated every year on 10 July as National Fish Farmers’ Day. It ended the industry’s dependence on wild-collected seed from rivers, which was seasonal and unreliable. Today hatcheries mostly use synthetic hormone preparations instead of pituitary extract, and seed is produced in large numbers in states such as West Bengal, Andhra Pradesh and Odisha.

Stages of catla culture

• Brood stock management: mature fish are kept in well-fed ponds and typically breed from about two to three years of age.
• Induced spawning: hormone injection leads to egg release, with a mature female producing very large numbers of eggs, reckoned in lakhs per kilogram of body weight.
• Hatching and nursery: eggs hatch within a day or so and the tiny spawn are reared in nursery ponds.
• Fingerling rearing: the young fish are grown to fingerling size before transfer.
• Grow-out: fingerlings are stocked in production ponds and raised for roughly 8 to 12 months before harvest.

Why is the catla stocked with rohu and mrigal?

The catla is stocked with rohu and mrigal because the three carps feed at different depths, so a single pond can make full use of its natural food without the fish competing strongly. This system is called polyculture or composite carp culture, and it is the standard approach to freshwater fish farming in much of India.

A common stocking pattern in three-species ponds gives catla roughly a third of the fish, although ratios change with local conditions and the farm’s goals. The catla’s rapid growth earns it a premium in the market, while the bottom and middle feeders convert other resources in the pond into additional harvest.

Composite carp culture expanded in India from the 1970s through national research and extension programmes and the Fish Farmers Development Agencies. Farmers who follow good practice in liming, fertilisation, aeration and feeding can raise yields well above those of traditional ponds, though the results depend heavily on water quality and management.

How fast does the catla grow?

The catla is among the fastest-growing Indian carps, often reaching around 1 to 1.5 kg within a year in well-managed ponds and larger sizes in the second year. This rapid growth is the main reason it is valued by farmers, who can harvest a marketable fish within one production season.

Growth depends on stocking density, water temperature, plankton supply, supplementary feeding and pond depth. Warm tropical conditions support the fastest growth, and catla slows when water temperatures fall in the cooler months of northern India. Because it feeds high in the pond, it responds quickly to plankton blooms created by fertilisation.

The fish does have a few disadvantages in culture. Its large head means that the dressing percentage, or share of edible flesh, is lower than for some other carps, and the fish can be susceptible to parasites and diseases when water quality drops.

How is the catla eaten in Indian cuisine?

The catla is eaten across eastern and northern India, most famously in Bengali and Odia kitchens, where it is cooked in light mustard-based curries, fried in steaks and valued for its rich, slightly oily flesh. The head is especially prized and is used in dishes such as muri ghonto, a rice-and-fish-head preparation of Bengal.

• Bengal: katla macher jhol, a thin curry with potato, and katla kalia, a thicker spiced gravy.
• Odisha: bhakur is cooked in mustard or tamarind-based curries and fried in slices.
• Festive meals: large catla is commonly served at weddings and ceremonial feasts in eastern India.

The fish is a good source of protein and provides minerals and vitamins typical of freshwater fish, but it has numerous fine intermuscular bones, which can make eating it tricky for children. As a freshwater fish, it generally has lower omega-3 content than oily marine species such as mackerel or sardine.

Why does the catla matter for Indian fisheries?

The catla matters for Indian fisheries because Indian major carps form the bulk of the country’s freshwater aquaculture, which supports millions of livelihoods and contributes to making India one of the world’s largest fish-producing nations. India is generally ranked second globally in fish production, behind China, and inland aquaculture accounts for a large and growing share of it.

Government schemes such as the Pradhan Mantri Matsya Sampada Yojana, launched in 2020 under the Ministry of Fisheries, Animal Husbandry and Dairying, aim to increase fish production, improve productivity and support fish farmers. Research bodies including the Central Institute of Freshwater Aquaculture (CIFA) in Bhubaneswar, a unit of the Indian Council of Agricultural Research, work on breeding and feed technology for carps.

Several challenges affect the sector. These include disease outbreaks such as epizootic ulcerative syndrome and parasitic infestations, loss of genetic quality in hatchery stock through inbreeding, climate stress on ponds, and decline of wild river populations. Efforts continue to improve seed quality, selective breeding and sustainable pond management.

What threatens the catla and how is it protected?

The catla is threatened mainly by changes to river habitats, such as dams that block migration, water pollution, over-fishing and loss of floodplain nurseries, along with weakened genetic quality in hatchery-bred stock. Wild populations in some river stretches have declined, even though the species as a whole is assessed as Least Concern.

• River regulation: barrages and dams interrupt the monsoon spawning movements.
• Pollution: industrial and domestic waste reduces oxygen and plankton quality.
• Over-fishing: capture of brood fish and juveniles reduces recruitment.
• Genetic erosion: repeated breeding from related fish can reduce growth and survival in hatchery stock.

Responses include selective breeding programmes, exchange of brood stock from different river systems to maintain genetic diversity, stocking of rivers and reservoirs with healthy seed, and fishing restrictions in breeding seasons. Fisheries researchers have also worked on improved strains of Indian major carps designed to grow faster under farm conditions.

Bottom Line

The catla is a big-headed, surface-feeding Indian major carp whose quick growth, polyculture compatibility and popularity in eastern kitchens make it central to inland aquaculture. Its story is tied to India’s 1957 breeding breakthrough and to the carp-farming model that still feeds much of the country.

Frequently Asked Questions

What is catla fish?

Catla is a large freshwater carp, scientifically named Labeo catla, native to the rivers of the Indian subcontinent. It is one of the three Indian major carps, along with rohu and mrigal, and has a broad head and an upturned mouth. It is widely farmed and eaten across India.

What is the difference between catla and rohu?

Catla has a broader, larger head, an upturned mouth and a surface-feeding habit, whereas rohu has a more streamlined body and feeds in the middle layers of water. Both are Indian major carps and are stocked together. Rohu usually shows a reddish tinge around the eyes.

How fast does catla grow in a pond?

Catla grows quickly and can reach about 1 to 1.5 kg in the first year in a well-managed pond. Actual growth depends on stocking density, temperature, plankton availability and feeding. It grows larger in the second year.

What does catla eat?

Catla eats mainly zooplankton from the upper layers of the water, along with some phytoplankton and organic matter. In ponds, farmers fertilise the water to increase plankton and add supplementary feeds such as rice bran and oilcake. Its surface-feeding habit means it rarely competes with rohu or mrigal.

Why is catla farmed with rohu and mrigal?

Catla is farmed with rohu and mrigal because the three carps feed in different layers of the pond, which makes full use of the food available. Catla feeds at the surface, rohu in the middle and mrigal near the bottom. This polyculture raises total fish yield per pond.

Is catla fish good to eat?

Yes, catla is a widely eaten freshwater fish valued for its rich, tasty flesh and good protein content. It is popular in Bengali and Odia cooking, where the head is especially prized. It does contain many fine bones, so it needs careful eating.

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