Question 5
(a) Mention two methods through which fish could be harvested from a pond.
(b) (i) Mention five fish processing methods.
(ii) Name three traditional fish preservation methods.
(iii) Name three modern fish preservation methods.
(c) State five factors that could cause mortality of fish fry.
(d) What is algal bloom as used in fisheries?
Observation
This question was attempted by many candidates and their performance was good. Most of the candidates answered the fish processing questions satisfactorily.
The expected answers are as follows:
(a) Methods of harvesting fish from a pond
- Total harvesting
- Partial harvesting
- Drag netting
- Cast netting
- Gill netting / Set netting
(b) (i) Fish processing methods
- Washing
- Scaling
- Gutting
- Decapitation
- Gilling
- Filleting / splitting
- Smoking
- Canning
- Salting / pickling
- Drying / sun drying
- Fermentation
- Mincing
- Frying
(ii) Traditional fish preservation methods
- Smoking
- Cooking
- Salting
- Drying / Sun drying
- Frying
- Fermentation
(iii) Modern fish preservation methods
- Freezing
- Chilling / icing
- Canning
- Irradiation
- Pickling
- Vacuum drying
(c ) Factors that could cause mortality of fish fry
- Inadequate feeding
- Poor water quality
- Feeding with poor quality feed
- Presence of predators
- Diseases
- Parasites
- Poor handling
- Over feeding
- Pollution
- Meaning of algal bloom as used in Fisheries
- It is the rapid growth / accumulation in the population of algae in water often resulting in colour scum on the surface.
OR
It is a rapid increase or aggregation in the algae population of freshwater or marine systems and is often identified by water discoloration of their pigments