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The roughhead grenadier is found in the North Atlantic Ocean at depths between 200 and 2,000 metres (660 and 6,560 ft) and water temperatures below 5.4 °C (41.7 °F). [4]
They are found at depths from around 200 meters (660 feet) to greater than 3,000 meters (9,800 feet). They normally prefer temperatures of between 1 and 4 °C (34 and 39 °F), although one species, the Antarctic roughhead (Macrourus whitsoni), has been collected at temperatures which were slightly below 0 °C (32 °F). [1]
They range in length from about 10 cm (3.9 in) in Hymenogadus gracilis to 2.1 m (6.9 ft) in Albatrossia pectoralis. Several attempts have been made to establish a commercial fishery for the most common larger species, such as the giant grenadier, but the fish is considered unpalatable, and attempts thus far have proven unsuccessful. [3]
The roundnose grenadier is a batch spawner [3] and is believed to migrate to the vicinity of Iceland to spawn in late summer or autumn. [4] The females reach maturity when they are nine to eleven years old and the males when they are rather younger. [6] Up to 35,000 eggs can be produced at a time. [4]
A slot limit is a tool used by fisheries managers to regulate the size of fish that can legally be harvested from particular bodies of water. Usually set by state fish and game departments, the protected slot limit prohibits the harvest of fish where the lengths, measured from the snout to the end of the tail, fall within the protected interval. [1]
Albatrossia pectoralis, the giant grenadier or giant rattail, is a very large rattail, [1] and the only member of the genus Albatrossia. [2] It is found in the north Pacific from northern Japan to the Okhotsk and Bering Seas , east to the Gulf of Alaska , and south to northern Baja California in Mexico .
Enneanectes boehlkei, known commonly as the roughhead triplefin, is a species of triplefin blenny. [2] This species occurs in the western Atlantic Ocean from the Bahamas west into the Gulf of Mexico, including the Florida Keys to Tuxpan, Mexico and throughout the Caribbean, it is absent from most of Cuba except the north west, and off the northern South American coast its range extends from ...
G. berglax – a parasite of the roughhead grenadier [1] G. bychowski – a parasite of the Caspian anadromous shad [1] G. capverdensis – a parasite of the spotted lanternfish [1] G. heraldi – a parasite of the seahorse Hippocampus erectus [1] G. hertwigi – a parasite of the European smelt and the Rainbow smelt [1] [2]