April 18, 2019
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FISHERY OBJ:!!!!!!!!!!!!!!!
1-10: BDABDDABDD
11-20: AACCBADACA
21-30: ACBDDBBDAA
31-40: DBCDCADBCB
Ia)
(i) Fisheries: The science of producing fish and other aquatic resources for the purpose of providing human food, although other aims are possible (such as sport or recreational fishing), or obtaining ornamental fish or fish products such as fish oil.
(ii) Fishery: A place where fish are reared for commercial purposes......
1bi)
Area of the pond, A = 2(lb + ld + bd)
A = 2(20×10 + 20×1.5 + 10×1.5)
A = 2(200 + 30 + 15)
A = 2(245)
A = 490 m²
1bii) Volume of the pond, V = l×b×h
V = 20×10×1.5
V = 300m³
Please use this corrected
It's a cuboid
The pond it has length, breadth and depth
1b)
i) Dumping of rubbish into fish ponds
ii)The use of artificial fertilizers: Ponds can be polluted if powdery chemical fertilizers containing nitrates are put on the crops near Fish ponds and then the powdery chemical fertilizers containing nitrates are washed into the fish ponds by rain
(1b(iii). Number of fish is given by :
= 8 × 490
= 3,920
1c i)
Cast net : A cast net , also called a throw net , is a net used for
fishing . It is a circular net with small weights distributed around its edge.
The net is cast or thrown by hand in such a manner that it spreads out on the water and sinks. This
technique is called net casting or net throwing. Fish are caught as the net is hauled back in. This simple device is particularly effective for catching small bait or forage fish
1cii)
Hook and line: Hooks and lines are gear where the fish is attracted by a natural or artificial bait (lures) placed on a hook fixed to the end of a line or snood, on which they get caught.
(2)
2d)
Rope
Floats
Cork
Plastics
(4a)
Fish marketing channel is the process where by fish starts with the fish farmer, passes through a number of intermediaries and ends with the ultimate consumer.
(4aii)
(i)fish harvester
(ii)local trade
(iii)retailers
(iv)consumers
(4bi)
feeding regime is defined primarily by the composition of the basic ration, then by feed supplements and concentrates. In other words is the farm of origin has been confirmed.
(4bii)
(i)Hand feeding
(ii)Demand feeding
(4ci)
-Plant-
(i)beans
(ii)lentils
(iii)Chickpeas
(iv)Peanuts
(v)Almonds
(4cii)
-Animals-
(i)meat
(ii)fish
(iii)poultry
(iv)eggs
(v)dairy
(5ai)
(i) quicklime
(ii) hydrated lime
(iii) limestone.
5aii)
(i) Harmful to fishes
(ii) It reduces rate of fish reproduction
(iii) It can be harmful to man when eaten the affected fish
(iv) It causes water pollution
(5aiii)
(i) Water
(ii) Temperature
(iii) pH
(5aiv)
A fishpond is a controlled pond, artificial lake, or reservoir that is stocked with fish and is used in aquaculture for fish farming, or is used for recreational fishing or for ornamental purposes. It may contain shallow water with marsh and aquatic plants and animals.
(5bi) Site selection:
(i) Consider the topography
(ii) Consider the soil type
(5bii) Staking:
(i) Consider the depth of the pond
(ii) Consider the size of the pond
(5biii) Stripping of topsoil:
(i) Mulching
(ii) improving of oxygen content by addition of freshwater
(5biv) Dyke construction:
(i) Checkmating the proper location for construction
(ii) Considering the distance to the pond
6a)
Zooplankton are a type of heterotrophic plankton that range from microscopic organisms to large species, such as jellyfish. Zooplankton are found within large bodies of water, including oceans and freshwater systems.
They are small floating or weakly swimming organisms that drift with water currents and, with phytoplankton, make up the planktonic food supply upon which almost all oceanic organisms are ultimately dependent
(6aii)
(i)Annelids
(ii)Molluscs
(iii)Worms
(iv)Phytoplankto
(6bi)
(i)Many water resources can potentially be used, including ponds, lakes, strip pits, rivers, and streams.
(ii)Cage culture requires a relatively small financial investment.
(iii)Feeding, sampling, observation, and harvesting are all comparatively simple.
(6bii)
(i)The fish are crowded in cages, and there is a relatively high incidence of disease that can spread rapidly.
(ii)There can be localized poor water quality, such as low dissolved oxygen, in and around cages.
(iii)Caged fish do not have access to natural food, so a nutritionally complete diet is required.
(6ci)
(i)lack of clean water
(ii)Poor nutrition
(iii)dirty environment
(iv)lack of treatment
(6cii)
(I)Hook
(ii)line and sinker.
(iii)Fishing rods
(iv)Fishing reels.
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