The blacksail snake mackerel (Thyrsitoides marleyi), known also as the black snoek, is a species of snake mackerel found in the Indo-Pacific from shallow water to a depth of at least 400 m (1,300 ft) where they appear to prefer slopes on seamounts and ridges.

[2] They are known for making diel vertical migrations to near-surface waters at night, feeding on fish, squid and crustaceans.

[2] This species is of minor importance to local commercial fisheries.

[2] However, a second extinct species, T. zarahoustrae Arambourg, 1967, is known from the Late Eocene-aged Pabdeh Formation of Iran and potentially the Early Oligocene of Romania.

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