Hapa Nets for Fingerling

Hapa Nets for Mass Fingerling Hatchery Production

The "Hapa Nets for Mass Fingerling Hatchery Production" technology i a cage-like enclosures (referred to as "hapa" nets) placed within ponds to safeguard and manage brooders, hatchlings, and juvenile fish. The hapa nets come in various shapes and sizes, using materials like wooden poles and mesh nets, offering an affordable solution for hatcheries of all sizes. The nets require periodic maintenance to ensure effective functionality, but they significantly improve the management and production of fingerlings for the aquaculture industry. These nets are designed to shield fish from predators, ensuring better control over breeding, feeding, and aeration. They provide a conducive environment for fish growth, resulting in enhanced fertilization rates, reduced mortality, and increased production of fry and fingerlings. This technology is well-suited for various aquaculture species and adaptable to different water bodies such as earthen ponds, riverbeds, or concrete tanks.

This technology is TAAT1 validated.

8•8

Scaling readiness: idea maturity 8/9; level of use 8/9

Positive or neutral impact

Adults 18 and over: Positive high
The poor: Positive medium
Under 18: Positive low
Women: Positive high

Positive or neutral impact

Climate adaptability: It adapts really well
Adaptability for farmers: It helps a lot
Biodiversity: It helps them grow and thrive
Carbon footprint: It reduces emissions a little
Environment: It makes a big difference
Soil quality: It makes the soil healthier and more fertile
Water usage: It uses the same amount of water

Problem

Inadequate supply of high-grade fingerlings from improved fish breeds
Poor and uneven growth rates
High fingerling mortality in open ponds
Predation by birds, reptiles, amphibians, and aquatic insects
Need for rapid and uniform production of fish stock
Difficulty in monitoring and managing brooders, hatchlings, and juveniles
Aggressiveness among fish during spawning leading to injury and mortality
Degradation of net materials in sunlight requiring periodic replacement
Damage from storms, winds, or heavy rainfall
Clogging of hapa mesh limiting water circulation and aeration
Poor water quality within the net without adequate circulation
Need for complete feeding regimes within the enclosure and adjustment during different growth stages
Scrubbing of hapa nets to prevent clogging and maintain water circulation
Accumulation of uneaten feed and fish waste resulting in poor water quality
Cleaning of dirty hapa nets with urea and scrubbing with a brush
Monitoring and recording of fry and fingerlings harvested from individual hapa for rearing efficiency optimization.

Solution

Provides a convenient means of safeguarding brooders, hatchlings, and juveniles from predators and other fish.
Eases the management of brooder, fry, and fingerlings, allowing for closer monitoring and adjustment of breeding, feeding, or aeration regimes.
Enables higher fertilization rates, even growth of fish seed, and reduced mortality, resulting in increased production of fry and fingerlings per unit area.
Allows for easy collection of fry from tilapia brooders and rearing of fingerlings inside a pond.
Offers large benefits for all-male fingerling production through manual sexing, hormonal reversal, or YY male technology.
Suitable for various aquaculture species such as tilapia, catfish, carp, prawn, and crayfish.
Can be installed in different water bodies such as earthen ponds, riverbeds, or large concrete tanks.
Can be adjusted in shape and size according to the dimension and depth of the water body.
Affordable and simple to build with materials like fine mesh screen netting, wooden poles, or floating barrels.
Can be used in ponds stocked with other fish without risk of competition.
Suitable for shallow water with low flow rate and level of fluctuation.
Allows for periodic scrubbing to prevent clogging and maintain water circulation and quality.
Can be cleaned easily with a brush and pond water, ensuring high levels of rearing efficiency through regular inspection and maintenance.

Key points to design your ORG TEXT

ORG specific text

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Cost: $$$ 1 USD

Per square meter

150—900 fingerlings per square meter

Production in hapa

8—20 fish farmers

Number of fish farmers in a single hatchery

IP

Open source / open access

Countries with a green colour: Tested & adopted
Countries with a bright green colour: Adopted
Countries with a yellow colour: Tested

Countries where the technology has been tested and adopted
Country	Tested	Adopted
Angola	Tested	Adopted
Benin	Tested	Adopted
Botswana	Tested	Adopted
Burkina Faso	Tested	Adopted
Burundi	Tested	Adopted
Cameroon	Tested	Adopted
Central African Republic	Tested	Adopted
Côte d’Ivoire	Tested	Adopted
Democratic Republic of the Congo	Tested	Adopted
Djibouti	Tested	Adopted
Equatorial Guinea	Tested	Adopted
Eritrea	Tested	Adopted
Ethiopia	Tested	Adopted
Ghana	Tested	Adopted
Guinea	Tested	Adopted
Kenya	Tested	Adopted
Madagascar	Tested	Adopted
Malawi	Tested	Adopted
Mali	Tested	Adopted
Mozambique	Tested	Adopted
Niger	Tested	Adopted
Nigeria	Tested	Adopted
Rwanda	Tested	Adopted
Senegal	Tested	Adopted
Sierra Leone	Tested	Adopted
South Sudan	Tested	Adopted
Sudan	Tested	Adopted
Tanzania	Tested	Adopted
Togo	Tested	Adopted
Uganda	Tested	Adopted
Zambia	Tested	Adopted

This technology can be used in the colored agro-ecological zones. Any zones shown in white are not suitable for this technology.

Agro-ecological zones where this technology can be used
AEZ	Subtropic - warm	Subtropic - cool	Tropic - warm	Tropic - cool
Arid
Semiarid
Subhumid
Humid

Source: HarvestChoice/IFPRI 2009

The United Nations Sustainable Development Goals that are applicable to this technology.

Goal 8: decent work and economic growth

Goal 12: responsible production and consumption

Goal 1: no poverty

Goal 2: zero hunger

Goal 5: gender equality

Goal 13: climate action

Deep Cleaning of Dirty Hapa Nets: Remove dirty hapa nets from the pond and soak them with urea for 72 hours. Wash the nets with a suitable cleaner and rinse thoroughly to ensure cleanliness.
Fry Production in Hapa: Utilize brooders weighing approximately 300 grams with a male to female ratio of 1:2 or 1:3. Maintain a stocking density of 4-5 brooders per square meter in the hapa nets.
Daily Monitoring and Transfer: Inspect the hapa nets daily to identify fry. Transfer the identified fry to other hapa tanks or rearing ponds for further growth and development.
Record-Keeping and Monitoring: Maintain detailed records of the number of fry and fingerlings harvested from each hapa net, along with feed input. This monitoring ensures and helps achieve high rearing efficiency.