NECO Fishery OBJ, ESSAY/Theory Questions and Answer – May/June 2017 Expo Runz
FISHERIES OBJ:
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3ai)
Fish Breeding is a complex issue when examining and comparing commercially important fish species, be that mollusc, crustacean or teleosts.
3aii)
i)Make sufficient supply of minnow by not depending on natural source.
ii)Producing high quality minnow species.
iii)Through artificial breeding we can get good sized and weights fish.
iv)Artificial breeding become very profitable if it possible to hatch 50% eggs.
v)It is possible to produce hybrid fish by mixing different species of fish.
3aiii)
i)lack of attraction flow
ii)unsuitable location of the entrance
iii)inadequate maintenance,
3bi)
i)Composite fish culture
ii)Cage culture
iii)Integrated fish culture
iv)Lacustrine fisheries culture
v)Sewage fisheries culture
3bii)
i)Inlet- To let water into the pond/impoundment
ii)Outlet/monk/spillway/stand pipe/overflow spout- To keep water at a suitable level in the pond
iii)Embankment/dyke/wall- Houses the cultured organism(fish)
iv)Harvesting basin- Collection point for all fishes during total harvesting/for easy removal
v)Core trench- Reinforces the dyke built with low clay soil to avoid seepage
1ai)
i)Low technology
ii)Seeds scarcity and inadequacy
iii)Land restriction
iv)Technical problem associated with production and management
v)Water pollution
1aii)
i)THE LAND
ii)THE SOURCE OF WATER
iii)ACCESSIBILITY
iv)SECURITY
v)FAR AWAY FROM POLLUTION
1bi)
i)Low Capital Investment:In addition to the on-farm production possibilities of organic fertilizers, organic fertilizers help in maintaining the soil structure and increasing its nutrient-holding capacity
ii)Fertility of Soil:Organic fertilizers ensure that the farms remain fertile for hundreds of years.
iii)Safe Environment:Organic fertilizers are easily bio-degradable and do not cause environmental pollution.
iv)Employment:We all know that chemical fertilizers are made in large plants that are automated and have an annual capacity of millions of tons.
v)On-Farm Production:The majority of organic fertilizers can be prepared locally or on the farm itself.
1bii)
i)Dissolved Oxygen It is the amount of oxygen dissolved in water. Most aquatic organisms need oxygen to survive and grow.
ii)Temperature is a measure of the average energy (kinetic) of water molecules. It is measured on a linear scale of degrees Celsius or degrees Fahrenheit.
iii)Electrical Conductivity/Salinity Solids can be found in nature in a dissolved form. Salts that dissolve in water break into positively and negatively charged ions. Conductivity is the ability of water to conduct an electrical current, and the dissolved ions are the conductors.
iv)pH is a measure of how acidic or basic (alkaline) the water is (the term pH comes from the French: “puissance d’Hydrogène” which means strength of the hydrogen). It is defined as the negative log of the hydrogen ion concentration.
v)Turbidity is a measure of the amount of suspended particles in the water. Algae, suspended sediment, and organic matter particles can cloud the water making it more turbid.
Suspended particles diffuse sunlight and absorb heat.
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