100% VERIFIED FISHERIES OBJ ANSWERS

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100% VERIFIED FISHERIES THEORY ANSWERS

1ai)
DO sensors

1aii)
Thermometer

1aiii)
nephelometer

1aiv)
PH metre


1b)
i)5 -12
ii)25- 30cm
iii)30cm
iv)6.5 -8.3


1c)
fish pond is a controlled pond, artificial lake, or reservoir that is stocked with fish and is used in aquaculture for fish farming.

1di)
i)It is practised in areas of high population pressure onland
ii)Modern machineries are used
iii)Labour intensive farming is used
iv)Artificial irrigation method is followed
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2a)
i)Abnormal feeding
ii)Over feeding
iii)Exposure of material


2bi)
Monoculture is the culture of single species of fish in a pond or tank


2bii)
Polyculture is the production of two or more fish species within a particular aquaculture environment.


2biii)
Integrated fish farming is a system of producing fish in combination with other agricultural livestock farming
operations centered around the fish pond


2ci)
i)Monoculture
i)it enable the farmer to make the feed that will meet the requirement of a specific fish.
ii)fish of different ages can be stocked thereby enhancing selective harvesting


2cii)
(Pick two)
i)Maximum fish production is possible in intensive polyculture
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ii)More profit from fish farming is possible.
iii)it create many emoloyment opportunity
iv)Intensive polyculture of fish is fully controlled by the farmer.
v)More fish can be cultivated and produced from short place.


2ciii)
i)Excrement from fish and livestock is high in
ammonia and nitrogen, which acts as a high-quality fertilizer for farmlands.
ii)In a properly integrated fish farming, livestock and crop farming system, the waste, excretion and manure from animals can be used as feed for the plants and the leftover waste from plants can be used to feed animals.
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3a)
i)Inland or Fresh Water Fisheries
ii)marine fisheries.


3b)
Scientific value:
Some fish like the lung fish are of zoological
importance because of their discontinuous
distribution and anatomical features.


3bii)
Aesthetic value:
A large number of fish are cultured in aquarium for their beauty and graceful movements.


3biii)
Fish as food:The fish flesh is an excellent source of protein, has very little fat, carries a good amount of minerals and vitamins A and D
and rich in iodine.
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5ai)
Fish preservation is the method of extending the shelf life of fish and other fishery products by applying the principles of
chemistry, engineering and other branches of science in order to improve the quality of the products.

5aii)
(Pick three)
i)Curing
ii)Icing
iii)Freezing
iv)Canning

5bi)
Artificial fish breeding is such a process by which minnow are produced artificially

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