Using hydrodynamics to modify fishing performance of a demersal fishing gear

Burgaard, Karen B.; Carstensen, Stefan; Fuhrman, David R.; Saurel, Camille; O’Neill, Finbarr G.

doi:10.1016/j.fishres.2023.106831

Fisheries Research

2023

DOI: 10.1016/j.fishres.2023.106831

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Using hydrodynamics to modify fishing performance of a demersal fishing gear

Karen B. Burgaard,

Stefan Carstensen,

David R. Fuhrman

et al.

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2024

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Cited by 3 publications

References 29 publications

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Trawling through time: reconstructing a late nineteenth century beam trawl for scientific inshore fishery investigations

Hunt,

Engelhard,

Pinnegar

et al. 2024

Maritime Studies

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Understanding long-term change in fish populations often relies on comparing catches from historical and contemporary trawl surveys. However, such comparisons may not resolve biases associated with differences in fishing gears and their relative catchabilities. It is possible to reduce these uncertainties by replicating historical trawl gear and practices. With the availability of unique historical catch data, we investigated the trawl gear employed by the Northumberland Sea Fisheries Committee (NSFC) during scientific surveys conducted between 1892–1913 in inshore waters of the Northumberland coast (UK), and describe our attempt to reconstruct the gear using currently available materials. We reviewed the historical literature, photographs and acquired technical expertise to reconstruct a late nineteenth century beam trawl used by the NSFC. The replica gear consisted of a 6.7 m beam connected by two Brixham style wrought-iron trawl heads, which held open a triangular-shaped trawl net with rounded ground-rope. Following construction, we tested the performance and catchability of the replica gear by conducting comparative trawls using a modern otter trawl in August 2018 and March 2019. Both trawl gears exhibited similar catches for flatfish in August trials, yet a higher proportion of individuals were landed by the otter trawl in March. Zero or negligible catches were exhibited by the replica gear during this period. This work collates relevant information to describe the evolution, design and functioning of late nineteenth century beam trawls used around the British Isles, providing an important repository for investigators interested in trawl technology and survey designs.

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Trawling through time: reconstructing a late nineteenth century beam trawl for scientific inshore fishery investigations

Hunt,

Engelhard,

Pinnegar

et al. 2024

Maritime Studies

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Numerical simulation of particles beneath a towed circular cylinder

Burgaard,

Carstensen,

Fuhrman

et al. 2024

Coastal Engineering

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Semi-pelagic self-adjusting otter boards: effects on the catching performance of a demersal trawl

Eighani,

Malta,

Melli

et al. 2024

Can. J. Fish. Aquat. Sci.

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In this study, we investigate whether replacing conventional seabed-contacting otter boards with semi-pelagic self-adjusting otter boards (SAO), which have the ability to maintain a given height above the seabed, affects catch efficiency of a demersal fish trawl. Experimental fishing trials, using the alternate haul method, were conducted in the Kattegat and Skagerrak with three otter board configurations using: conventional seabed-contacting otter boards; the SAO set to maintain a target height over the seabed of 1 m; and the SAO set to maintain a target height 5 m. Replacing conventional otter boards with SAO resulted in a loss of catch efficiency for haddock (Melanogrammus aeglefinus), whiting (Merlangius merlangus), and plaice (Hippoglossoides platessoides), while no significant difference was found for cod (Gadus morhua), common dab (Limanda limanda) and lemon sole (Microstomus kitt). When comparing the SAO - 1m and SAO - 5m, it was observed that SAO - 5m resulted in a loss of catch efficiency for haddock and plaice, a minimal reduction for cod and no significant difference for whiting, common dab, and lemon sole.

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Using hydrodynamics to modify fishing performance of a demersal fishing gear

Cited by 3 publications

References 29 publications

Trawling through time: reconstructing a late nineteenth century beam trawl for scientific inshore fishery investigations

Trawling through time: reconstructing a late nineteenth century beam trawl for scientific inshore fishery investigations

Numerical simulation of particles beneath a towed circular cylinder

Semi-pelagic self-adjusting otter boards: effects on the catching performance of a demersal trawl

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