Evaluating potential biodegradable twines for use in the snow crab fishery off Newfoundland and Labrador

Five biodegrabable twine types were investigated for potential use in the snow crab (Chinoecetes opilio) fishery that operates off Newfoundland and Labrador, Canada. The five twine types included 1) 2-ply Sisal, 2) 3-ply Cotton 60-threated, 3) 3-ply Cotton 72-thread, 4) 3-ply Cotton 96-thread and 5) 3-ply Hemp 40 strand. Each twine was deployed at sea for 124 days and their degradation rates over time were studied. The results indicate variability in twine degradation rates. The 3-ply cotton 96-thread twine was the best performing twine.  Over the study period, this twine rapidly declined in breaking strength. The total reduction was 63% of the initial strength.  In addition, there was a statistical relationship between breaking strength and soak time for three twin types 1) 2-ply Sisal, 2) 3-ply Cotton 60-thread and 3) 3-ply Hemp 40 strand. The 2-ply cotton 96-thread is now required for use by all fisheries in the province of Newfoundland and Labrador targeting snow crabs.