How many shad can be caught in one day?

The correct answer is based on Maine's fishing regulations, which specify the daily limit for catching shad. According to these regulations, anglers are allowed to catch up to 2 shad per day. This limit is set to ensure sustainable fishing practices and protect the species from overfishing, particularly during spawning seasons when their populations may be more vulnerable.

This regulation reflects a balance between recreational fishing opportunities and the health of fish populations. Understanding and adhering to such limits is essential for both conservation and responsible enjoyment of Maine's natural resources. The other options do not align with the established limitation and therefore represent incorrect daily catch limits for shad.