Blacksail snake mackerel
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  where they appear to prefer slopes on seamounts and ridges. They are known for making diel vertical migrations to near-surface waters at night, feeding on fish, squid and crustaceans. This species reaches a total length of  though most are around . This species is of minor importance to local commercial fisheries. It is at the only member of the genus Thyrsitoides, making the genus monotypic. References

Further reading

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Gempylidae
Fish described in 1929