Catches in abandoned snow crab (Chionoecetes opilio) pots in the Barents Sea

• Published in: Marine pollution bulletin Vol. 173; no. Pt A; p. 113001
• Main Authors: Humborstad, Odd-Børre, Krøger Eliassen, Lasse, Siikavuopio, Sten Ivar, Løkkeborg, Svein, Ingolfsson, Olafur Arnar, Hjelset, Ann Merete
• Format: Journal Article
• Language: English; Norwegian
• Published: England Elsevier Ltd 01.12.2021; Elsevier BV
• Subjects: Animals; Baiting; Barents Sea; Brachyura; Cannibalism; Chionoecetes opilio; Crustaceans; Decapoda; Digestive glands; Energy reserves; Fisheries; Fishing; Ghost fishing; Glands; Hepatopancreas; Hunting; Male; Marine crustaceans; Meat; Potential resources; Pots; Reserves; Seafood; Self-baiting; Snow crab pots; Unaccounted mortality; Wounds; Barents Sea; Unaccounted mortality; Self-baiting; Cannibalism; Barents Sea; Snow crab pots; Ghost fishing
• ISSN: 0025-326X; 1879-3363
• DOI: 10.1016/j.marpolbul.2021.113001

During a 2018 retrieval cruise for abandoned snow crab (Chionoecetes opilio) pots in the Barents Sea, approximately 8600 pots abandoned 1.5 years earlier were recovered. Forty-three percent of a subsample of 1000 pots contained snow crabs, with an average of three crabs per pot. Most of the crabs were alive (~98%) and dominated by large males. Pinch injuries and limb loss were common and tended to decline with increasing crab size. Reflex testing showed that the crabs were vital (i.e. the crabs moved their legs, chelipeds and maxillipeds when stimulated), which was supported by a relatively high meat content. However, energy reserves in the digestive glands (hepatopancreas reserves) were low, indicating overall energy deficiencies. Our results indicate considerable unaccounted mortality due to self-baiting, continued catch and cannibalism. The findings demonstrate that snow crab pots which are lost or abandoned in the Barents Sea fishery maintain huge potential for ghost-fishing impacts. •Retrieval programs are highly valuable for derelict fishing gear impact studies.•Evaluation of individual of crabs cues the dynamics of the ghost fishing cycle.•Self-baiting, continued catch and cannibalism are likely in lost snow crab pots.•Lost pots have huge potential for ghost fishing; mitigation measures are urgent.