Aquaculture Site Selection Lecture 3
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Questions and Answers

What is the seepage rate of sand in cm/day?

  • 0.25
  • 1.3
  • 2.5 (correct)
  • 0.8

    • What is the volume of water required to fill the pond in the first cycle?

  • 500m3
  • 2000m3
  • 1000m3 (correct)
  • 3000m3

    • How many days are considered in a year for water loss estimation?

  • 365 days (correct)
  • 450 days
  • 350 days
  • 400 days

    • What is the estimated yearly water requirement of the pond in litres?

    <p>9,300,000 litres</p> Signup and view all the answers

    What is the purpose of taking water samples from the proposed water source?

    <p>To define Physical, Chemical, and Biological properties of water</p> Signup and view all the answers

    Why is water quality important in Aquacultural Production?

    <p>Because cultured organisms depend upon the environment</p> Signup and view all the answers

    How many steps are involved in estimating the yearly water requirement of the pond?

    <p>5 steps</p> Signup and view all the answers

    What is the primary objective of selecting a site for aquacultural production?

    <p>To practice aquacultural production effectively</p> Signup and view all the answers

    What is the conversion factor from cubic meters to litres?

    <p>1m3 = 1000 litres</p> Signup and view all the answers

    Which type of aquaculture is practiced in lakes?

    <p>Cage Culture and Pen Culture</p> Signup and view all the answers

    What is essential for land-based aquacultural production?

    <p>Assessment of ecological, biological, and socio-economic factors</p> Signup and view all the answers

    What is a source of water for land-based aquaculture?

    <p>All of the above</p> Signup and view all the answers

    Why is water quantity important for land-based aquaculture?

    <p>To ensure adequate supply for aquacultural production</p> Signup and view all the answers

    What is an example of a water-based aquaculture site?

    <p>Cage farm</p> Signup and view all the answers

    What is considered when assessing ecological factors for land-based aquaculture?

    <p>Water quantity, soil characteristics, land topography, climate, and hydrology characteristics</p> Signup and view all the answers

    What type of aquaculture is practiced in mangrove swamps?

    <p>Oyster culture</p> Signup and view all the answers

    What is the preferred pH range for growth?

    <p>PH 6 to 9</p> Signup and view all the answers

    What is the most important water quality variable in Aquaculture?

    <p>Dissolved Oxygen (DO)</p> Signup and view all the answers

    Why is Dissolved Oxygen (DO) limited in water?

    <p>Due to low solubility</p> Signup and view all the answers

    What is a source of Dissolved Oxygen (DO) in water?

    <p>Atmosphere and Photosynthesis</p> Signup and view all the answers

    What is the minimum Dissolved Oxygen (DO) requirement for Tilapia eggs?

    <p>8mg/l</p> Signup and view all the answers

    What is the toxic form of Ammonia?

    <p>NH3 (Unionized)</p> Signup and view all the answers

    What should be avoided when selecting a site for aquaculture?

    <p>Areas adjacent to heavily populated areas</p> Signup and view all the answers

    Why is it desirable to have a site with a regular shape?

    <p>To allow for future expansion</p> Signup and view all the answers

    What is one of the factors to consider when evaluating a site for aquaculture?

    <p>Type and density of vegetation</p> Signup and view all the answers

    What is an advantage of selecting a site with low-cost land?

    <p>It reduces the initial investment cost</p> Signup and view all the answers

    Why is it important to assess the climate of a site for aquaculture?

    <p>To assess the feasibility of the project</p> Signup and view all the answers

    What climate factor is important to consider in aquaculture?

    <p>All of the above</p> Signup and view all the answers

    Why is it important to consider hydrological data in commercial pond aquaculture?

    <p>To cover aspects of floods and water elevations</p> Signup and view all the answers

    What should be considered when evaluating a site for aquaculture?

    <p>All of the above</p> Signup and view all the answers

    What is a crucial biological factor to consider before selecting a site for an aquaculture project?

    <p>Species to be cultured and its availability</p> Signup and view all the answers

    What is a key social-economic factor to consider when assessing a site for an aquaculture project?

    <p>Development plans for the project area</p> Signup and view all the answers

    What is a necessary factor to consider when selecting a site for a cage fish farming project?

    <p>Site must have a suitable depth for placing and protecting cages</p> Signup and view all the answers

    What is a vital operational factor to consider when selecting a site for an aquaculture project?

    <p>System of culture: extensive, semi-intensive, or intensive</p> Signup and view all the answers

    What is an important factor to consider when assessing the availability of staffing for an aquaculture project?

    <p>Availability of staff with adequate experience of pond management</p> Signup and view all the answers

    What is a critical factor to consider when evaluating the market for an aquaculture project?

    <p>Location of markets for the produce and determining demand</p> Signup and view all the answers

    What is an essential factor to consider when assessing the financial viability of an aquaculture project?

    <p>Costs of equipment, materials, feeds, etc. needed for running the project</p> Signup and view all the answers

    What is a vital social-economic factor to consider when selecting a site for an aquaculture project?

    <p>Ownership of the land, availability of land, and land regulations</p> Signup and view all the answers

    Study Notes

    Sites for Aquacultural Production

    • Lakes are suitable for Cage Culture, Pen Culture, and Kariba, Bangweulu
    • Rivers are suitable for Pond Culture, Cage Culture, Pen Culture, and Kafue
    • Dams/Reservoirs are suitable for Cage Culture, Pond Culture, Pen Culture
    • Swamps are suitable for Pond Culture
    • Coastal areas are suitable for Pond Culture, Cage Culture, Pen Culture
    • Bays, Estuaries, Lagoons are suitable for Cage Culture
    • Mangrove Swamps are suitable for Oyster culture

    Factors Considered in Selecting a Site for Land-Based Aquaculture (Earthen Pond Aquaculture)

    • Ecological factors to be considered: water quantity, water quality, soil characteristics, land/topography, climate, hydrology characteristics
    • Biological factors to be considered: species to be cultured, availability of stocking materials
    • Socio-economic factors to be considered: development plans, ownership of land, availability of land, land regulations, proximity to road connections, availability of electricity, telephone/radio connections, equipment, services, and supplies

    Factors to Consider in Selecting a Site for Land-Based Aquaculture (Water Quantity)

    • Availability of water must be assured
    • Water sources can be irrigation canals, rivers, creeks, reservoirs, lakes, springs, streams, rainfall runoff, deep wells, boreholes, and seepage water
    • Calculate estimated yearly water requirement in liters for a pond

    Steps to Estimate Water Quantity

    • Step 1: Find the volume of water to fill the pond in the first cycle
    • Step 2: Find the volume of water to fill the pond in the second cycle
    • Step 3: Estimate water loss due to seepage
    • Step 4: Estimate water loss due to evaporation
    • Step 5: Estimate the yearly water requirement of the pond

    Water Quality Factors

    • Physical, chemical, and biological properties of water must be considered
    • Water quality variables to be monitored: DO, pH, ammonia, temperature, etc.
    • DO is the most important water quality variable in aquaculture
    • DO levels: Tilapia eggs 8mg/l, adults 2mg/l to 8mg/l, Common Carp adult minimum 3mg/l maximum 5mg/l, African catfish adult minimum 1mg/l or less, preferred 3mg/l

    Factors to Consider in Selecting a Site for Land-Based Aquaculture (Soil Characteristics)

    • Soil structure: sand, sand loam, loam, clayey loam, loamy clay, clay
    • Seepage rate: sand 2.5 cm/day, sand loam 1.3 cm/day, loam 0.8 cm/day, clayey loam 0.25 cm/day, loamy clay 0.025 cm/day, clay 0.125 cm/day

    Factors to Consider in Selecting a Site for Land-Based Aquaculture (Climate)

    • Assess climate of the site for aquacultural production
    • Climatological factors to consider: mean monthly temperature, mean monthly rainfall, mean monthly evaporation, mean monthly wind speed and direction
    • Incidence of high winds, heavy storms, or cyclones should be considered

    Factors to Consider in Selecting a Site for Land-Based Aquaculture (Hydrology)

    • Hydrological data: floods, water elevations of existing water sources (rivers, irrigation channels, reservoirs, springs, etc.)

    Social-Economic Factors

    • Development plans for the project area
    • Ownership of the land, availability of land, land regulations, and rights
    • Proximity to all-weather road connections
    • Availability of electricity, telephone/radio connections, equipment, services, and supplies
    • Availability of construction materials, location of markets, and demand for the produce
    • Availability of organic and artificial fertilizers, drugs, and chemical materials
    • Availability of supplementary feeds, costs of equipment, materials, feeds, etc.
    • Availability of suitable transport facilities, ice for use in marketing, staff with adequate experience of pond management, skilled and semi-skilled laborers, reasonable amenities for permanent staff, and local financing methods or credits

    Site Selection Considerations for Water-Based Aquacultural Production (Site for Cage Fish Farming)

    • Site must have a suitable depth for placing and protecting cages from strong winds and rough weather
    • Site must have a suitable location for cage placement and water quality management

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    Description

    This quiz covers the selection of sites for aquacultural production, including factors to consider for land-based and water-based aquaculture.

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