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In page Dusky dolphin:

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Dusky dolphins prey on a variety of fish and squid species. Common fish species eaten include anchovies, lantern fish, pilchards, sculpins, hakes, horse mackerel, hoki and red cod.[1] They are generally coordinated hunters. Their very flexible foraging strategies can change depending on the environment.[2] In certain parts of New Zealand, where deep oceanic waters meet the shore, dusky dolphins forage in deep scattering layers at night.[2] They arrive at the hunting site individually, but form groups when in the layer.[2] The dolphins use their echolocation to detect and isolate an individual prey.[3] Groups of foraging dolphins tend to increase when the layer is near the surface and decrease when it descends.[2]