If this is a true or false question, the answer would be true. The double effect would refer to a situation where a beneficial action can have harmful side effects. It would mean that it would be fine to do an act if there are 2 effects, one bad and one good.
The answer is True. Doing something morally good has a morally bad
side-effect is known as double effect, it is ethical to do it provided that the
bad side-effect is not your intention. This is common in the case where a doctor
gives drugs to a patient to relieve painful symptoms even though he knows doing
this may shorten the patient's life.
overpopulation and it because harmful and hard to control and possibly will diminish the number of normal fishes by killing them with their dangerous life threatening spikes