Disease and Pest Management

A ______ is a condition that develops in an organism and then damages it in some way

• disease

• pest

• parasite

• predator

A _______ is a plant, animal, or other organism that is detrimental to a species.

• disease

• pest

• parasite

• predator

Which of the following is NOT a reason why the environment in which aquacrops grow harbors diseases and pests?

• High concentrations of aquacrops allows for more rapid transfer of diseases and pests from one individual to anther.

• Uneaten feed, fish excrement, and excess fertilizer provide nutrients for the growth of weeds.

• Handling causes stress, and stress, in turn, reduces resistance to some diseases and pests.

• High populations in ponds, open tanks, and raceways are protected from predators.

___________ losses occur when the aquacrop is attacked or injured.

• direct

• indirect

• proportionate

• disproportionate

_________ losses result when the environment in which an aquacrop is living is less than ideal.

• direct

• indirect

• proportionate

• disproportionate

Water birds and other predators can catch and eat or injure fish. This is an example of a(n) ______ loss.

• direct

• indirect

• proportionate

• disproportionate

Weeds grow in water, tying up nutrients and making harvest difficult. This is an example of a(n) ______ loss.

• direct

• indirect

• proportionate

• disproportionate

A(n) ___________ disease is caused by germs or pathogens that may be transferred from one fish to another.

• direct

• indirect

• infectious

• noninfectious

A(n) ______________ may be due to improper diet, poor environment, chemicals, and/or physiological changes.

• direct disease

• indirect disease

• infectious disease

• noninfectious disease

ESC is a disease in fish caused by the bacterium Edwardsiella ictaluri. It is easily transmitted from one fish to another. It is an example of a(n) ___________________.

• infectious disease

• noninfectious disease

• parasite

• predator