Which of these statements are true: Fishing decreased because of strict regulations, while aquaculture doubled because of favorable regulations. Fishing increased only to a certain maximum, whereas aquaculture quadrupled in production volume.

A. 1
B. 2
C. None

The statement "Fishing decreased because of strict regulations, while aquaculture doubled because of favorable regulations" is true. However, the statement "Fishing increased only to a certain maximum, whereas aquaculture quadrupled in production volume" is not mentioned in the given information, so it cannot be determined whether it is true or false. Therefore, the correct answer is C. None.