Which fish has an unlimited daily bag limit?

The fish that has an unlimited daily bag limit is the northern pike. This regulation is in place to help manage and control the population of this species, which can sometimes grow larger and dominate local ecosystems. By allowing anglers to catch as many northern pike as they wish, wildlife management authorities aim to encourage the harvest of these fish to keep their populations in balance and ensure other fish species in the habitat aren't adversely affected.

In contrast, other fish options listed have specific limits to maintain their populations. For instance, American eel are subject to conservation efforts due to declining numbers, leading to regulations that restrict how many can be caught. Similarly, alewives and shad are also regulated in terms of daily limits to support their populations and avoid overfishing, which is crucial for maintaining healthy aquatic ecosystems. Thus, northern pike stands out as the species that anglers can catch in unlimited quantities each day.