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Spawning takes place during the winter, with the peak of activity occurring from December through February. Most spawning takes place off the edge of the continental shelf in deep waters of 600 to 1,500 ft (183 to 457 m). Male halibut become sexually mature at 7–8 years of age, while females attain sexual maturity at 8–12 years.
The Atlantic Halibut is a batch spawner where females lay anywhere from a few thousand to four million eggs (depending on the size and age of the fish, older females tend to lay only two million in one spawning period [citation needed]). Spawning occurs between December and April near the bottom of the ocean between 5 and 7 °C (41 and 45 °F).
California halibut typically weighs 6 to 30 pounds (3 to 23 kg), with the largest reported weighing 72 pounds (32.7 kg). It is rare, but they can grow up to 60 inches (1.52 m), [2] and their average length is 12 to 24 inches (30 to 61 cm). [7] The largest fish of this species are females since they grow faster, and males do not grow as large.
Halibut do not reproduce until age eight, when about 80 cm (30 in) long, so commercial capture below this length prevents breeding and is against US and Canadian regulations supporting sustainability. Pacific halibut fishing is managed by the International Pacific Halibut Commission. For most of the modern era, halibut fishery operated as a derby.
Greenland halibut spawn from January–March. [7] [13] During spawning, Greenland halibut will perform spawning rises where they will rise up through the water column from deep water to depths of around 200–350 m where they will release their eggs and sperm before descending back to deeper water. [7]
There was so much flooded grass with the high water this year, the shad spawn was incredible. All the fish are spitting up shad, and the surface around the boat is filled with floating shad ...
Greenland populations spawn in 0–5 metres (0–16 feet) of water, while North Sea (bank) herrings spawn at down to 200 m (660 ft) ... cod, and halibut. ...
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