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1ai)
i)darkening of fish skin
ii)slow sluggish movement resulting in the death of the affected fish
iii)red/brown spots on fish skin
iv)swelling of the abdomen with protuding scales
v)loss of appetite
1aii)
i)from dirty and untreated water
ii)from feeds
iii)philometrid nematodes
iv)leaches
v)cymothoidids
1bi)
i)it can lead to unwanted algae
ii)it prevent light penetration
iii)it will diplet oxygen needed by the fish
iv)it causes carbonation and increase in acidity of the water
v)
1bii)
i)regular weeding
ii)aeration
iii)desilting
iv)de-weeding
v)control of algae and de-carbonisation
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2ai)
i)PVC pipe
ii)spawing mop
iii)spong filter
iv)tank divider
v)marbles
2aii)
i)contour ponds
ii)barrage ponds
2aiii)
i)zooplankton
ii)brine shrimp nauplli
iii)trout starter
2bi)
i)availability of the fish
ii)ability to adapt to weather changes
iii)it should be borny
iv)high density stocking
v)amealable to polyculture
2bii)
i)tilapia
ii)cat fish
iii)trout
2biii)
cropping is the process removing or destocking of fish for various reasons
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5ai)
i)to prevent biode-gradation (spoilage of harvested fishes.
ii)it helps to kill micro-organism in the fish eg bacteria
iii)it improves the quality of the fish
iv)it allow the fish to last longer than when its not processed
v)fish processing like smoking allows huge quantities of these fishes to be shipped(transported) to long distance/market
5aii)
i)they should not be stressed up/weak breeders as they may die leter
ii)they should be hardly and active fishes
iii)they must be disease free
iv)fish selected for brood stock purposes must be wounds – free
v)fishes selected for brood stock purposes must be of fairly bigin size
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5bi)
i)spawning to ensure the survival of the species
ii)the sexes are usually kept seperate
iii)brood stocking
iv)brood stocking handling and acclimatisation/conditioning
v)incubation of fertilized eggs
5bii)
i)fish smoking
ii)packaging of fish
iii)marketing of the fish
iv)filleting
v)refrigerating
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