Breeding:  Matures at about 10 years at a length of about 100 cm. (Maturity size and age varies in different areas). 
Winter spawner on the sea bed at depths of 300-1,000 metres, usually about 700 metres. 
2 million + large eggs. 
Metamorphosis of larvae to flatfish shape at a length of approx. 23 mm (Russell). 
Habitat: Usually at depths of 100 metres and below. Seas of this depth are only found off the western coasts of Ireland and Scotland. However, the young fish spend their lives inshore in shallower water at depths of around 30 metres for between 2 and 4 years. (Sussex fish) 
This fish is not confined to the sea bottom. One western Atlantic fish has been recorded travelling a distance of 2600 km over a 7 year period. 
Temperature range 2.5° C - 8° C. 
Food: Active mid-water and bottom feeder over depths of between 100-2,000 metres. Fish, squids of many species, including Redfish, Capelin, Haddock, Cod and  Herring. 
Range:  North Atlantic coasts in cold water (Arctic-Boreal fauna) south Spitzbergen (Svalbard) - Ireland, Iceland, southern Greenland-Newfoundland and Chesapeake Bay  (USA). Formerly plentiful in Massuchusetts Bay. 
Additional Notes:
A 39.25 stone (550 lb) (=250 kg) Halibut caught by Arthur D. Campbell (d. 2006)  at the East Horns Iceland on 18th May 1963. 
Fish landed in Aberdeen, Scotland by the Ben Cairn trawler. 

A massive two metre long Atlantic Halibut, Hippoglossus hippoglossus, was caught by  fishermen and brought into Aberdeen in August 1998. It weighed 135 kg (298 lb). Although in the past Halibut up to 2.5 metres long were reported, these fish no longer get the opportunity to attain this size. They are caught before they grow to their maximum size. 
The largest fish caught on rod and line from a boat in British seas weighed 106 kg (234 lb) and was caught by C. Booth off Dunnet Head, north Scotland, in 1979. 
In 1957 a fish of about 232 kg (511 lb) was landed by commercial fishermen at Grimsby.
More Information on this Fish (Link)
The World Angling Record for Halibut is from Norwegian seas.The largest Hippoglossus hippoglossus caught on rod and line from a boat in Norway weighed 161.2 kg and was caught at Valevågsbråtet the 20th of October 1997. (Superceded by a bigger fish.)
The biggest Atlantic Halibut caught off Iceland by commercial fishermen was 3.65 m long and weighed 266 kg. 
The Halibut is found on both sides of the North Atlantic Ocean and until recently the largest specimen caught on rod and line was off the United States and weighed 115.8 kg (255 lb). 

My father caught a 195 kg (428 lb) Halibut off the south-west coast of Nova Scotia, Canada, in the late 1960's. I have also caught a couple over 136 kg (300 lb), in the deep water in the middle of the bay of Fundy (Nova Scotia).  These fish were caught by otter trawling. 
Randy W. Theriault   EMail: haliday@glinx.com

Information Credits at Halibut File
Halibut (Index to British Marine Fish /External) 
Information wanted: Please send any records of this fish, with location, date, who discovered it, how it was identified, prevalence, research into fish farming, food of juveniles, growth rates, diet, specimen fish, juvenile fish in shallow water and any other details to 
Shorewatch Project EMail Glaucus@hotmail.com. 
 
 

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