Wildlife authorities and marine mammal volunteers are trying to get better photos of the dolphins' dorsal fins to determine if these six are part of the pod that created such a stir last year.
Federal authorities decided the pod should be left alone, even if some died. At least six did, and a seventh dead dolphin is suspected to have come from the group as well.
Dolphin volunteers wanted the animals removed from the river back out to sea, arguing that past forays into the river often ended in death.
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