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CULTURE


Alternative

Rice-Fish CULTURE Alternate or Rotational rice-fish culture system is the production of rice and fish after the harvest of one kind. It consists of stocking the rice fields with fish selected size and species to obtain fish crop in addition to rice.


modified

Rice-Fish CULTURE Modified rice-fish culture system is the construction of a fish pond, 10 % of the total field area, 90% for rice production.


s u o e n a t l u m i s

Rice-Fish CULTURE Simultaneous rice-fish culture system is the production of rice and fish at the same time. It consists of stocking the rice fields with fish selected size and species to obtain fish crop in addition to rice (Sign et al, 1980).


Advantages: g Maximizes the utilization of farm resources and enable the farmers to diversify harvest. Provides additional income opportunities to the under utilized labor resources. Recycling of nutrients by the fish through feeding and depositing feces in the soil increases the uptake of nutrients such as phosphorus and nitrogen by the rice. Increases rice production by 10-15%. Reduce chemical and labor cost of weeding. Fish consumes organisms that are nuisance to plants. Serve as a source of cheap protein which will improve nutritional value in rural areas.

Design g and Size of the Paddy y Paddies should be designed in a way that independent filling of water can be carried out. This will allow better water manipulation and management. The recommended size of paddy is between 200-2,000m2. However, smaller paddies are easier to manage than larger ones.


Construction of Trenches for Simultaneous Rice-fish Culture (10% of total area) Trench is a canal constructed within the paddy which will serve as: • retreat for fish during the period of temperature extremes; • refuge when pesticides and fertilizers are being applied and unexpected drop of water level; • passage ways for easy movement of fish around the paddy; and • catch basin during harvest time.

Types of Trenches Peripheral trench Constructed along the four sides of a paddy, this helps protect plants from rat infestation. However, this occupies a larger area which results in more loss of rice yield when compared to other designs.

Center trench Dug across the paddy, occupies narrower area, thus maximizing the loss of rice yield, lesser construction cost.

T-trench Situated on the perimeter and the center.

Pit style

Dug at the center of the paddy for the same purpose.


Paddy Preparation Paddy Preparation • • • • • • •

Increase dike height to hold more water Screen inlet and outlet of water Sundry soil until cracked for conditioning Lime if needed (10g/m2) to neutralize pH Fertilize with chicken manure (20-30 g/m2.) Fill with water (20cm) to grow natural food Increase water depth to an average of 0.75 – 1 meter deep

Water Management Water Management The availability and maintenance of good water quality is an important consideration in the culture of tilapia. Water depth should be maintained. Paddies should be provided with good water exchange for replenishment of oxygen and removal of waste metabolites. This will also allow entry of new food organisms into the paddy.


Fish Stocking Fish Stocking

Stocking should be done early in the morning or late in the afternoon. The number of fish to be stocked depends on the species of fish and availability of food. However, you may increase stocking rate depending on the culture system employed.

Culture system Alternative rice-fish culture Modified rice-fish culture Simultaneous rice-fish culture

Stocking Density/m2 3 pcs 3 pcs 1 pcs

With Supplemental Feeding: • • • • • • • •

Rice bran Azolla Fish meal Vegetables Bread crumbs Kitchen refuse Termites Commercial animal feed


Harvesting Harvesting Stocks are harvested after 3-4 months. The presence of thick mud in the rice paddies makes harvest by seining difficult. In this case, attracting the fish through incoming water and harvesting is more effective. In case of earthy smell or taste, place harvested stocks in separate pond or hapa for about 2 days with flowing water before dispersal.

Cost and Return Analysis-Simultaneous Cost and Return Analysis for one 500 square meter Paddy one culture period (Simultaneous) Production Cost: Labor at 2 days at PhP 350/day (dike height increase excavation) 250 pcs Tilapia fingerlings #14 3 bags Feeds @ P 850/bag Total PhP Gross Income = 50 kgs @ P 80.00/kg PhP Less: Production Cost Marketing Expenses (2% of sales) Total PhP NET INCOME/ CYCLE Return of Investment: ROI = Net Income (one cycle only) Total Project Cost ROI = 545.00 x 100 3,455.00

ROI =

16 %

x

PhP 100

700.00 125.00 2,550.00 3,375.00 4,000.00 3,375.00 80.00 3,455.00 545.00


Cost and Return Analysis-Alternate Cost and Return Analysis for one 300 square meter Paddy one culture period (Alternate) Production Cost: Labor: 10 days at PhP 350/day (dike height increase excavation) 1650 pcs Tilapia fingerlings #14 (5pcs/m2) 9 bags Feeds @ P 850/bag Total PhP Gross Income: 188.5 kgs (Less: 20% mortality) @ P 80.00/kg PhP Less: Production Cost Marketing Expenses (2% of sales) Total PhP NET INCOME/CYCLE Return of Investment: ROI = Net Income (one cycle only) Total Project Cost ROI = 2,803.40 x 100 12,276.60

ROI =

23 %

x

PhP 100

3500.00 825.00 7650.00 11,975.00 15,080.00 11,975.00 301.60 12,276.60 2,803.40


Cost and Return Analysis-Modified Cost and Return Analysis for one 100 square meter Fishpond in a 1000 square meter Rice Field (Modified) Production Cost: Labor (New - Excavation of 100 cu.m. fishpond, 67 days @ 350/day) ( Old - Pond preparation, 5 days @ 350/day) Fingerlings #14 (500 pcs @ .50/pc) 3 bags Feeds @ P 850/bag Total PhP Gross Income = 100 kgs @ P 80.00/kg PhP Less: Production Cost Marketing Expenses (2% of sales) Total PhP NET INCOME/CYCLE

Return of Investment: ROI = Net Income (one cycle only) Total Project Cost ROI = 3,290.00 x 100 4,710.00

ROI =

70 %

x

PhP 100

*23,450.00 1,750.00 250.00 2,550.00 4,550.00 8,000.00 4,550.00 160.00 4,710.00 3,290.00


BUREAU OF FISHERIES AND AQUATIC RESOURCES Cordillera Administrative Region BPI Compound, Guisad, Baguio City (074) 443-67-16 bfarcar@yahoo.com 2012


RIce-Fish Culture