fish mortality

Question 1

It is the synonymous with loss of life.

Answer 1

Mortality

Question 2

loss of population (natural sources)

Answer 2

Natural mortality

Question 3

loss of population (external factors)

Answer 3

Fishing mortality

Question 4

common in any aquatic movement.

Answer 4

fishkill

Question 5

natural causes of fish mortality

Answer 5

1. Oxygen depletion
2. Presence of toxic algae
3. Hydrogen sulfide
4. Mortality due to bacterias or parasites

Question 6

unnatural causes of fish mortality

Answer 6

1. Pesticide
2. Saltwater
3. Sewage

Question 7

General management approach

Answer 7

1. The water flow should be increased.
2. The pond should be flushed with clean, fresh water.
3. Stale and bottom water should be pumped out.
4. Surface water should be aerated.
5. Dead and dying fish should be removed.

Question 8

a controlled biological treatment.

Answer 8

composting

Question 9

this doesn’t harm the environment

Answer 9

Recycling or reusing

Question 10

refers to the heating process

Answer 10

rendering

Question 11

done by depositing fish carcases

Answer 11

water depot

Question 12

a preferred option for fish farmers

Answer 12

on-site burial

Question 13

an animal that preys on aquaculture fishes

Answer 13

predator

Question 14

killed or seriously killed by predators

Answer 14

direct damage

Question 15

non-lethal wounding of fish

Answer 15

indirect damage

Question 16

an animal that is the major reasons for fish loss.

Answer 16

birds

Question 17

An animal that also attacks other fish.

Answer 17

fishes

Question 18

Animal that usually attacks juvenile tilapia.

Answer 18

frogs and toads

Question 19

attacks juvenile fishes.

Answer 19

Insects and insects larvae

Question 20

They attack all types of fish.

Answer 20

Humans

Question 21

destroys larval and juvenile fish.

Answer 21

snakes