2020/2021 WAEC/NECO Answers: 2021 neco fishery answer



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This is actually the 2018 neco fishery answer Answers as questions sent to our subscribers on WHATSAPP, if you are looking for 2021 WAEC/NECO Answers midnight before the exam, try contacting us.



(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

============

(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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