FISHERY

FISHERY- obj

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4ai)
Water quality refers to the chemical, physical, biological, and radiological characteristics of water. It is a measure
of the condition of water relative to the requirements of
one or more biotic species and or to any human need or
purpose.

4aii)
i)temperature,
ii)dissolved oxygen
iii)pH level 
iv)Ammonia. 
v)Water turbidity

4aiii)
i)Temperature is thermometer 
ii)Dissolved oxygen is dissolved oxygen sensor 
iii)PH level is PH meter, 
iv)Ammonia is litmus paper
v)Water turbidity is nephelometer or turbidimeter

4bi)
-Advantages-
i)It yield high harvest
ii)It increases farmers income
-Disadvantages-
i)High capital is required 
ii)High technical know how is required

4c)
diagrams
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5ai)
stocking- is the practice of raising fish in a hatchery and releasing them into a river, lake, or the ocean to supplement existing populations, or to create a population where none exists.

Stocking- density is the quantity of fry or fingerlings per unit of water area.

5aii)
i)Fertilization of the pond/addition of manure.
ii)Maintaining water level.
iii)Repair of pond and the fence.
iv)Cropping /selective removal of excess fish.

5bi)
i)Pseudomonas fluorescens
ii)Ichthyophthirius multifiliis 
iii)fungal infections 
iv)Eustrongylides 
v)copepods

5bii)
i)Anorexia (loss of appetite, refusing all food, with consequential wasting)
ii)Rapid breathing
iii)Hiding abnormally
iv)Resting on the bottom
5c)
Area= length x breadth 
Area= 30 x 20
Area = 600m²
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