fish mortality Flashcards
It is the synonymous with loss of life.
Mortality
loss of population (natural sources)
Natural mortality
loss of population (external factors)
Fishing mortality
common in any aquatic movement.
fishkill
natural causes of fish mortality
- Oxygen depletion
- Presence of toxic algae
- Hydrogen sulfide
- Mortality due to bacterias or parasites
unnatural causes of fish mortality
- Pesticide
- Saltwater
- Sewage
General management approach
- The water flow should be increased.
- The pond should be flushed with clean, fresh water.
- Stale and bottom water should be pumped out.
- Surface water should be aerated.
- Dead and dying fish should be removed.
a controlled biological treatment.
composting
this doesn’t harm the environment
Recycling or reusing
refers to the heating process
rendering
done by depositing fish carcases
water depot
a preferred option for fish farmers
on-site burial
an animal that preys on aquaculture fishes
predator
killed or seriously killed by predators
direct damage
non-lethal wounding of fish
indirect damage
an animal that is the major reasons for fish loss.
birds
An animal that also attacks other fish.
fishes
Animal that usually attacks juvenile tilapia.
frogs and toads
attacks juvenile fishes.
Insects and insects larvae
They attack all types of fish.
Humans
destroys larval and juvenile fish.
snakes
