Food Crisis Series 26
"Palay-isdaan" (Rice-Fish Culture)
An Agro-Ecology Model
Dr Abe V Rotor
Palay-isdaan is a revival of a virtually lost art and indigenous farming system and industry. Since the late fifties, the introduction of pesticides and chemical fertilizers and their rampant use decimated wildlife in ricefields. As a rule therefore, the ricefields must be free of these poisons, for palay-isdaan to succeed.
Top, clockwise: lowland ricefield during monsoon season; harvesting fish ahead of rice harvest as monsoon ends; close-up of Azolla, aquatic fern as natural source of fertilizer, fish food, and mulch in controlling weeds in the ricefield; duck raising may be integrated with rice-fish culture.
Many wildlife species are found in ricefields as their natural habitat. These are commonly freshwater fish like hito, dalag, gurami, martiniko, and lately, since the fifties, tilapia. Then we have ulang (freshwater lobsters), shrimps, kuhol, suso’, and tulya. Strong rains release these organisms from their hibernation, usually in carabao wallows, ponds, and river basins – or in mud where they were ensconced during summer. The ricefields become one huge lake at the peak of the rainy season, and as the water subsides, these organisms are trapped in the paddies. Farmers pick them up for food, which is indeed a good source of protein for his family. Many find it a sport hunting them, while others find ways of protecting them until they reach maturity. The latter is the basis of palay-isdaan technology, which has these features.
1. The dike (pilapil) must be strong and high enough to prevent the fish to escape. To do this, trenches are dug around the rice field like a moat, two meter wide and one-half meter deep. The soil material is used to rebuild the dike.
2. Another model is to build a wide trench, 3 to 4 meters wide and one-half meter deep, running through the center of the rice paddy. This is usually done in low-lying areas where the water stays much longer. The trench serves as a natural trap for the fish as the surrounding water subsides.
3. A third model is recommended for irrigated areas where the rice field is managed like a fishpond. Here the farmer selects the fish he wants to grow, provides them with supplemental feeds, and gives attention more than what the other two models require. A commercial model would mean converting 30 percent of the total area into trenches.
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4. Because it takes time for the fish to grow to maturity it is advisable to plant traditional varieties which mature in 110 to 130 days. But this is feasible only where the rainy season is long and water supply is readily available. Traditional varieties generally do not need chemical spraying and fertilization.
Well-managed rice-fish farms in Central Luzon and other parts of the country can yield as much as 200 kg of tilapia per hectare. At P100 per kilo, the gross value is P20,000. While this gives around15 percent additional income, the farmer should consider a reduction in rice yield by at least 5 percent. Still palay-isdaan gives more income than rice monoculture.
Irrigated areas can have two fish crops a year, but this is not advisable because of the high cost of irrigation. Besides, it is virtually impossible to grow palagad rice (summer crop) without heavy dependence on chemical pesticides and fertilizers.~
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Palay-isdaan is a practical and cheap source of food and nutrition for the farming family. It provides a natural sport and recreation most especially to children. Palay-isdaan is among the attractions in agro-tourism.
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Acknowledgement: Internet photos
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