Long spiky spiked head
| Long spiky spiked head | ||||||||||||
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Long- pricked spiny head ( Sebastolobus altivelis ) |
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| Scientific name | ||||||||||||
| Sebastolobus altivelis | ||||||||||||
| Gilbert , 1896 |
The long-spiked spiny head ( Sebastolobus altivelis ), English Longspine thornyhead , is a marine fish in the family of spiked heads . It occurs on the Pacific coast of North America from southern California to Alaska and the Aleutian Islands .
features
The fish is conspicuously red in color, juvenile fish under 5 centimeters are black and can grow up to 39 centimeters; Sizes around 30 centimeters are common. The maximum known age is 45 years.
The dorsal fin usually has 15, sometimes 16 fin spines and 8 to 10 soft rays. The fin spines are non-toxic. The anal fin is supported by three spines and 4 to 6 soft rays. The caudal fin is rounded, the pectoral fins are indented. The head spines are very strong.
Way of life
The long-spiked spiked head lives close to the ground on soft soils at a depth of 370 to 1600 meters. It has adapted to the high pressure, the low oxygen content of the water and the low food supply with a slowed metabolism ; the fish can survive without food for up to 180 days. In general he eats u. a. of krill, brittle stars and other lower life forms found on the deep sea floor. But cannibalism also occurs, i. H. large fish hunt smaller specimens.
The fish is hunted as prey by larger animals.
Reproduction
Females reach sexual maturity at around 23 years of age and lay around 2,000-50,000 eggs in January to May.
Danger
The long-spiked spiny head is not listed on the IUCN Red List , but is endangered by overfishing and bottom trawling . The fish is caught in Canada and exported to Japan , where it is considered a delicacy. From 1996 to 2005, around 6,500 tons were fished in Canada.
literature
- Eschmeyer, Herald, Hamann: Pacific Coast Fishes , Peterson Field Guides, ISBN 0-395-33188-9