Abstract
Greenland halibut (
Reinhardtius hippoglossoides
) is a commercially important species in the northeast
Atlantic trawl fishery. However, direct fishing for it is not allowed and it can only be harvested as
bycatch. We investigated for the first time the size selection of Greenland halibut in a newly developed
double steel grid system designed for the cod and haddock bottom trawl fishery. In this sorting system
the first grid (lower grid) replaced the lifting panel present in the traditional Sort-V single grid system
often applied in the fishery. Thus, it contributed to the fish sorting process and simultaneously guided
fish to the second grid (upper grid). However, the results showed that nearly all Greenland halibut
escapees left through the second grid. The release efficiency of the first grid was estimated to be low,
and only 11% of the Greenland halibut entering the grid zone made contact with this grid in a way that
provided a size-dependent release probability. In contrast, the estimations showed that all Greenland
halibut, still in the gear after the first grid, made contact with the second grid. However, this contact
was suboptimal for size selection of most individuals, as the estimated 50% retention length (based
on the morphology of Greenland halibut) was below the expected value. Comparison of the release
efficiency of the new double grid system relative to that of the grid systems used in the fishery today
revealed that the new system did not improve the release of undersized Greenland halibut. Moreover,
we found that the existing Sort-V single grid system released significantly more Greenland halibut
than the new double grid system.
Reinhardtius hippoglossoides
) is a commercially important species in the northeast
Atlantic trawl fishery. However, direct fishing for it is not allowed and it can only be harvested as
bycatch. We investigated for the first time the size selection of Greenland halibut in a newly developed
double steel grid system designed for the cod and haddock bottom trawl fishery. In this sorting system
the first grid (lower grid) replaced the lifting panel present in the traditional Sort-V single grid system
often applied in the fishery. Thus, it contributed to the fish sorting process and simultaneously guided
fish to the second grid (upper grid). However, the results showed that nearly all Greenland halibut
escapees left through the second grid. The release efficiency of the first grid was estimated to be low,
and only 11% of the Greenland halibut entering the grid zone made contact with this grid in a way that
provided a size-dependent release probability. In contrast, the estimations showed that all Greenland
halibut, still in the gear after the first grid, made contact with the second grid. However, this contact
was suboptimal for size selection of most individuals, as the estimated 50% retention length (based
on the morphology of Greenland halibut) was below the expected value. Comparison of the release
efficiency of the new double grid system relative to that of the grid systems used in the fishery today
revealed that the new system did not improve the release of undersized Greenland halibut. Moreover,
we found that the existing Sort-V single grid system released significantly more Greenland halibut
than the new double grid system.