Final answer:
Without explicit context, we infer that overfishing and other human activities may have led to the disappearance of trout and salmon from waters near a fishing village in Memo's lifetime.
Step-by-step explanation:
To identify which species have disappeared from waters near the fishing village in Memo's lifetime, we can reference similar ecological scenarios and the provided information. We understand that overfishing can lead to the collapse of fish populations, as mentioned in the case of the cod population. The same principle applies to other aquatic animals that face extinction due to human activities.
While the question does not provide a definitive answer, it is known that certain species such as salmon are an important source of protein for people, and aquatic animals like the Yangtze River Dolphin have been driven to extinction because of human development and activity in the waterways. Therefore, for the species that have disappeared from waters near the fishing village in Memo's lifetime, we can infer that overfishing and possibly other human-related activities might be responsible for the reduction or extinction of fish species such as trout and salmon (option a).