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 , and grows to in total length. First discovered by and named after James Yate Johnson. References Tony Ayling & Geoffrey Cox, Collins Guide to the Sea Fishes of New Zealand, (William Collins Publishers Ltd, Auckland, New Zealand 1982) slender codling Fish of the North Atlantic Yellow Sea slender codling slender codling