The slender codling or slender cod (Halargyreus johnsonii) is a morid cod, the only species in the genus Halargyreus.

It is found in all oceans, at depths from 450 to 3,000 m (1,480 to 9,840 ft), and grows to 56 cm (22 in) in total length.

First discovered by and named after James Yate Johnson.

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