Final answer:
A testable question about fish reproduction is whether fish always reproduce in the same place.
Step-by-step explanation:
A testable question about how fish find suitable places to reproduce is: Do fish always reproduce in the same place? This question can be tested scientifically by observing and studying different fish species to determine if they consistently choose the same location for reproduction. Researchers can collect data on fish behaviors and habitats to answer this question.
Learn more about Fish reproduction