Known to most as “Laemonema”, is an endemic north Pacific representative of morid fish, widely distributed in the northwest part of the Pacific Ocean from the coasts of Japan and the southern part of the Sea of Okhotsk to the north as far as the Bering Sea. It is a bentho-pelagic species, living at depths of from 200–2000 metres.
Certain shoals even penetrate as far as the Sea of Okhotsk. The immature fish also take part in this fattening migration, and in certain years they form a massive shoal from the Sea of Okhotsk side of Paramushir Island. With the onset of cooler temperatures in autumn and winter, hakeling begins its return migration to the Japanese coast, where in the winter months the mature fish gather at depths of from 400–1100 m.
This fish has an elongated brownish body, narrowing towards the tail and it is covered in small scales. It has two dorsal fins, of which the first is short, while the second is very long. A distinguishing feature of the hakeling’s external structure is its abdominal fins, each of which consists of one long ray divided at its root into two, and extends almost to the middle of its body (which is why it is called long-finned). The length of the hakeling attains 72 cm, and its body weight — 1400 g, while it lives to 17. It is a slow-grown fish, which only matures at the age of 5–6 with a length of 43–47 cm. On average, it lays 456 000 roe.