Neco 2017 Fishery (Obj And Theory) Answers – May/June Expo

FISHERIES OBJ:
1BEDBBBEADB
11EABDDDCEAC
21ADABEBBEEC
31DCBCDCDCDA
41DADDDACDEC
51DBBCADDCDE
=======================
5ai)
Area=length * breath
Area= 20 * 15
Area= 300m^2
5aii)
i)clarias gariepinus
ii)haterobranchus longifilis
iii)heterobranchus bidorsalis
iv)heterobranchus isopterus
v)clarias batrachus
5bi)
i)harvesting
ii)fish feeding
iii)water monitoring
iv)fish processing
v)fish transportation
vi)sorting
5bii)
i)it can lead to fish death
ii)it increases water turbidity
iii)it causes diseases transmission
iv)it reduces the activities of fish
v)it hooks the gills of the fishes and causes in injury to
them
=========
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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