The New Fishman Pirates were a group of fishman-based pirates residing in Fishman Island, though they also included several merfolk, sea beasts, and enslaved humans. The New Fishman Pirates were the most prominent figures in the long history of human/fishmen hate over their hero Fisher Tiger's death. They carried on the legacy of Arlong, having established their crew based on Arlong's ideals. Like Arlong, they wished to make fishmen the supreme race and aimed to sink the humans into the ocean. With their arrest following their defeat at the hands of the Straw Hat Pirates (save for the human pirates, who were allowed to leave freely), the New Fishman Pirates are no longer active.
Their jolly roger consists of the Sun Pirates' sunny rim, with a crossed out decapitated person within - incidentally forming a double negative, further suggesting their irrationality.
Hammond and Hody both bear the Arlong Pirates tattoos on the left side of the neck and left arm respectively, to signify their respect for Arlong's ideals and actions. None of the crew members seem to be from the original Fishman Pirates or Arlong Pirates.
Prior to their defeat, the New Fishman had a grand total of 100,000 crewmembers; about 70,000 of them were fishmen from the Fishman District and 30,000 were human pirates that were captured and were used as slaves. However, 50,000 of them were taken out in an instant by a blast of Luffy's Conqueror's and later the New Fishman Pirates were breaking up during the battle when the human slaves were freed by Robin, who then retaliated against the New Fishman Pirates followed by the lower echelons of the New Fishman Pirates abandoning the crew after Hody Jones' defeat and realizing that the officers were insane and were the ones truly involved with the death of Otohime; this was even enforced by the officers attacking them and Brook saving their lives, for which they were grateful.