Deepsea fish are highly vulnerable to over-exploitation and have a low resilience to fishing. Fishing effort on tusk impacts other deepwater species and habitat. Avoid eating.
Tusk are found from depths of 20 m to 1000 m, but mainly inhabit deep water from 150 to 450 m. It spawns from April to July. It is regarded as the 'odd fish out' in the gadoid family (the group of fish that includes cod and haddock) because of its solitary and sedentary nature. It grows slowly and can attain a length of 120 cm and weight of 30 kg. Males and females mature at about 50 cm and 8 to 10 years old. Maximum age is about 20 years. It's life history traits are in line with other members of the gadoid family and suggest that tusk is less vulnerable to fishing mortality than typical deep-water species.
Many of the deepwater fisheries, including those for tusk, have limited data and there is little or no evidence that they are sustainable. Neither are there specific objectives for their management known to ICES. ICES Advice 2013, Book 9
ICES Advice 2013, Book 9
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Tusk is taken in mixed fisheries with ling and as a bycatch species in longline, trawl and gillnet fisheries for a range of species, including cod. It is mainly fished in depths in the range of 200-500 m. Fishing on the Mid-Atlantic Ridge is in the depth range 500-800m. Deep sea ecosystems are highly vulnerable and have a very low resilience, thus the impacts of any large scale removal of fish or abrasion of the seabed caused by fishing gear are likely to be severely detrimental with recovery slow, especially with regard to coldwater corals. Many deepsea fisheries are experimental and are targeted with heavy bottom trawling gear, which can decimate seamounts and ocean ridge ecosystems. Lost gear, especially static gear such as gillnets, is likely to ghost fish for a very long time, as there are few currents in the deep sea to collapse or degrade the nets. Any bycatch in deepsea fisheries is likely to be of vulnerable species. Thus deepwater fisheries are considered unsustainable.
Based on method of production, fish type, and consumer rating: only fish rated 2 and below are included as an alternative in the list below . Click on a name to show the sustainable options available.
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