Development and testing of an ultra-low-opening trawl to improve utilization of quota of atlantic cod (Gadus morhua) in the groundfish fishery of New England

Abstract

A team of researchers, fishermen, and a netmaker in New England developed an ultra-low-opening trawl (ULOT) With a goal to reduce catches of overfished Atlantic cod (Gadus morhua) Without loss of catches of other commercially important flatfish species. Use of the ULOT reduced catch rates of Atlantic cod by a mean of 48.0 kg/h (46.8%) compared With the use of a standard bottom trawl. It also reduced catch rates of American plaice (Hippoglossoides platessoides) by a mean of 9.5 kg/h (14.3%) but not catch rates of 3 other commercial species and 1 taxonomic group that also dominated catch. Length-based reductions in catch rates Were observed, primarily for undersized American plaice (<30.5 cm in total length [TL]), midrange yellowtail flounder (Limanda ferruginea) (36–38 cm TL), and large Witch flounder (Glyptocephalus cynoglossus) (>40 cm TL). Mean ULOT headrope height Was 0.73 m, and 9.1% of fuel Was saved. Economic evaluation indicated that the ULOT can increase profitability and fishing time by 53.7% and 88.1%, respectively, confirming that it is a viable option for fishermen to avoid Atlantic cod While accessing quota of more abundant groundfish species.