NECO Fisheries Practical Question And Answers [15th July 2021]

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FISHERY PRACTICAL ANSWERS
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(1a)
Specimen A – *Hetertis* Niloticus ( Bony tongue/ slap water)

Specimen B – Parachanna Obscura ( Snake head fish)

Specimen C – Heterobranchus longifilis (Cat fish)

Specimen D – Frog

(1aii)
[img]https://i.imgur.com/sT4qVxv.jpg[/img]

(1aiii)
-Differences-
(i)A has teeth on their tongue and roof of their mouth while B does not have teeth
(ii)A has a long head while B has a flattened head

-Similarities-
(i)They are both live in fresh water
(ii)They both have back bone
(iii)They both have gills for breathing
(iv)They both have teeth’s
(v)They both eyespot
(vi)They both have tongue
(vii)Scales are present in the both of them

(1bi)
(i)Madtoms
(ii)Brown bullhead
(iii)Yellow bullhead

(1bii)
-Important-
(i)They serve as food for the fish
(ii)They add certain nutrients to the environment

-Harmful effects –
(i)It compete with the fishes for food and other nutrients
(ii)They kill smallest fish in the pond

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(2ai)
Specimen E – Digger
Specimen F – Hoe
Specimen G – Rake
Specimen H – File

(2aii)
[img]https://i.imgur.com/R7qr0Mj.jpg[/img]

(2aiii)
-Specimen E-
(i)It is used for the removal of roots of trees, stumping.
(ii)For tilling of very hard soil.

-Specimen F-
(i)It is used for weeding.
(ii)For transplanting some crops.

-Specimen G-
(i)It is used for leveling or spreading soil surface after hoeing.
(ii)For covering vegetable seeds when they are broadcast.

-Specimen H-
(i)It is used for sharpening blades of farm and fishing tools.
(ii)It is used for smoothening rough surfaces of farm and fishing implements.

(2bi)
Ways of maintaining F
(i)Keep in a cool dry place after use
(ii)Wash and clean after use
(iii)Oil and grease rust parts

Precautions in using E
(i)Ensure the handle is firm before usage
(ii)Do not strike close to your legs

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(3ai)
Specimen I – Secchi disc
Specimen J – PH meter
Specimen K – Gill net
Specimen L – Drag net

(3aii)
Specimen I ;
It is use to measure water transparency or turbidity in bodies of water.

Specimen J
It is use to measure hydrogen-ion activity

Specimen K
It is use to catch fish by their gills.

(3aiii)
Specimen I
It reduce sunlight

Specimen J
It is used in detector and measurement.

(3bi)
dragnet is dragged across the bottom of a body of water while gillnet isa vertical net

-Similarities-
(i)Both have handles
(ii)Both have net
(iii)Both are used for harvesting fish
(iv)They both float on water
(v)They both hang in water column

(3bii)
Ways of maintaining J
(i)Regular calibration of your pH meter
(ii)Keeping your electrode clean is an easy way to extend its life.
(iii)Store in cool dry place

Maintaining K
(i)Keep in cool dry place after use
(ii)Clean after use
(iii)Ensure to dry all water after usage

(3biii)
Precautions of using I
(i)Ensure to take the reading from an established monitoring site.
(ii)never wear sunglasses while making the reading because this can affect visibility of the Secchi disk

Precautions in using J
(i)Avoid temperature fluctuations and never keep the pH meter exposed to direct sunlight.
(ii)The glass electrode should not be left out of the storage solution for prolonged intervals

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