Jyotish Barman and Homeswar Kalita
ICAR RC for NEH Region, Nagaland Centre
With rising input costs and increasing pressure on land and water resources, farmers are looking for production systems that can generate more income from limited resources. Integrated pig–fish farming offers one such practical approach by combining pig rearing and fish culture in the same farming system. The system is based on a simple principle: waste from one component becomes a useful input for another. Pig dung is used as organic manure in the fish pond, where it promotes natural productivity and contributes to fish nutrition. At the same time, water from the pond can be used for cleaning the pig house. Thus, the system encourages recycling of farm resources while reducing the need for external inputs.
Preparing the pond
In the northeastern region, fish farming generally begins around April with the onset of pre-monsoon showers. Before stocking fish, the pond should be properly prepared. Ponds ranging from 0.1 to 1 hectare, with a depth of about 1.0–2.5 metres, are suitable for integrated pig–fish farming. Pond preparation includes dewatering, removal of excess bottom mud and weeds, and renovation of the pond where necessary. Soil and water pH should also be checked, and agricultural lime applied at the recommended rate to maintain suitable water quality.
A suitable home for the pigs
A clean and well-ventilated pig house is essential for successful pig rearing. The pigsty may be constructed beside the pond or, where appropriate, over the pond. It should have strong walls, proper roofing and adequate ventilation. The floor should be rough and slightly sloping towards a drain so that waste and wash water can be conveniently collected or channelled. A pig weighing 70–90 kg requires approximately 3–4 square metres of floor space. Separate housing arrangements for boars, sows and finishing pigs are recommended. An enclosed run can also provide pigs with space for sunlight, exercise and dunging.
Introducing piglets
For integrated farming, improved breeds such as White Yorkshire, Hampshire, Landrace and Large Black are preferred because of their early maturity, good growth, prolific breeding and comparatively better disease resistance. For a one-hectare pond, about 40–45 piglets may be introduced. Weaned piglets around 2–3 months old should preferably be introduced into the pig house 20–25 days before fish fingerlings are stocked. This allows pig manure and leftover feed to increase the natural productivity of the pond before fish are introduced.
Feeding the pigs
Pigs may be fed a balanced ration or pig mash twice a day. However, exclusive dependence on commercial feed can increase production costs. Farmers can reduce feeding expenses by using locally available feed ingredients, provided the ration supplies adequate nutrients. A concentrated pig feed can be prepared using ingredients such as rice bran, rice polish, wheat bran, broken maize, groundnut oil cake, fish meal, mineral mixture and common salt in appropriate proportions.
Stocking the fish pond
Once the piglets have been introduced for 20–25 days, the pond can be stocked with fish fingerlings. Carp polyculture is generally practised in this system, using species such as catla, silver carp, rohu, grass carp, mrigal and common carp. Fingerlings measuring 10–15 cm are generally preferred. A stocking density of around 10,000 fingerlings per hectare is followed. A commonly used combination consists of 25% catla, 15% silver carp, 20% rohu, 10% grass carp, 20% mrigal and 10% common carp.
Fingerlings should preferably be released during the cooler hours of the day, such as early morning or late afternoon. Fingerlings transported in oxygen-filled packets should first be acclimatized by floating the unopened packet in the pond for about 20–30 minutes before gradual release.
Fish feeding and pond management
One of the major advantages of the integrated system is that additional feed for fish is generally not required, as nutrients entering the pond from the pig unit help support natural fish production. Grass carp, however, should be supplied with green fodder such as para grass and Napier grass. Banana leaves and other leafy vegetables can also be provided.
Regular monitoring of pond water quality is essential. Continuous accumulation of organic matter can affect water quality and may encourage excessive algal growth, commonly known as an algal bloom. If an algal bloom is observed, the flow of pig-house waste into the pond should temporarily be stopped. Fish behaviour should also be monitored regularly; active swimming indicates good condition, whereas sluggish movement may signal water-quality or health problems. Periodic application of agricultural lime may be required to maintain suitable pond conditions and manage pH.
Keeping pigs healthy
Good hygiene is just as important as good feeding. Pigsties should be cleaned daily and disinfected regularly, while pigs should be washed at suitable intervals. Health problems such as swine fever, piglet diarrhoea, skin infestation and worm infestation may affect pigs. Maintaining hygienic conditions and following an appropriate vaccination schedule are therefore essential. Veterinary advice should be sought whenever health problems arise.
Intermediate Harvesting
Integrated pig–fish farming can provide farmers with income from two complementary enterprises. Fish weighing 300 g or more can be partially harvested, particularly where stocking density is high. Partial harvesting reduces competition among fish and provides additional income while allowing the remaining fish to grow.
Pigs generally reach marketable size in about six months, depending on breed, feeding and management.
Potential production
With proper management, a production of approximately 2,500–3,000 kg of fish per hectare of pond area may be obtained. Pig production also depends on breed, feeding and management, with the source article indicating that 60–70 kg live weight may be achieved with proper care. Actual production, however, will vary according to management practices and local conditions.
A promising option for small farmers
Integrated pig–fish farming demonstrates how two enterprises can be linked to make better use of farm resources. Pig manure can contribute to pond productivity, while the pond supports fish production and can provide water for cleaning the pig unit. At the same time, farmers can earn income from both pigs and fish. For farmers with suitable land and water resources, this integrated approach can therefore serve as a practical means of recycling farm waste, reducing dependence on external inputs and diversifying farm income. With proper pond management, animal husbandry, water-quality monitoring and veterinary care, pig–fish farming can become a useful component of sustainable and resource-efficient farming systems.
