An overview of the hooking mortality of elasmobranchs caught in a swordfish pelagic longline fishery in the Atlantic Ocean

@article{Coelho2012AnOO,
  title={An overview of the hooking mortality of elasmobranchs caught in a swordfish pelagic longline fishery in the Atlantic Ocean},
  author={Rui Coelho and Joana Fernandez-Carvalho and Pedro G. Lino and Miguel Neves dos Santos},
  journal={Aquatic Living Resources},
  year={2012},
  volume={25},
  pages={311-319}
}
Hooking (or "at-haulback") fishing mortality was analysed in elasmobranchs captured by Portuguese long- liners targeting swordfish in the Atlantic Ocean. Information was collected by on-board fishery observers who moni- tored 834 longline fishing sets between August 2008 and December 2011, and recorded information on 36 067 elasmo- branch specimens from 21 different taxa. The hooking mortality proportions were species-specific, with some species having relatively high percentages of live… Expand

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References

SHOWING 1-10 OF 31 REFERENCES
Pelagic shark bycatch in the tuna- and swordfish-directed longline fishery off southern Africa
The capture of pelagic sharks as bycatch of the South African pelagic longline fleet targeting tuna Thunnus spp. and swordfish Xiphias gladius was investigated during the period 1998-2005. In all, 26Expand
Fishing gear modifications to reduce elasmobranch mortality in pelagic and bottom longline fisheries off Northeast Brazil
TLDR
Comparisons between circle (size 18/0, 0° offset) and J-style hooks demonstrated that the circle hooks have a greater efficiency in reducing the mortality of most species caught, both in pelagic and coastal longline fisheries. Expand
The estimated short-term discard mortality of a trawled elasmobranch, the spiny dogfish (Squalus acanthias)
TLDR
In evaluating the range of 72 h trawling mortalities found across pen trials, estimated tow-weight was a significant predictor of mortality, explaining 67% of the variation, suggesting that penning stress was merely an additive factor compounding initial capture stress that dictated the 72 h mortality of trawled individuals. Expand
Bycatch and discard mortality in commercially caught blue sharks Prionace glauca assessed using archival satellite pop-up tags
TLDR
A preliminary estimate of 20 000 t of annual dead discards for North Atlantic blue sharks is similar to that of the reported nominal catch, and could substantially change the perception of population health if incorporated into a population-level stock assessment. Expand
Effects of hook and bait on targeted and bycatch fishes in an equatorial atlantic pelagic longline fishery
TLDR
The effects of different hook style and bait type combinations on the catches of targeted, bycatch, and discarded fishes in equatorial atlantic waters indicated that the effects of hook Style and bait on the cpuEs were species-specific. Expand
Decreases in Shark Catches and Mortality in the Hawaii-Based Longline Fishery as Documented by Fishery Observers
Abstract This article summarizes catch data for sharks collected by fishery observers during two periods (1995–2000 and 2004–2006) in the Hawaii-based pelagic longline fishery, which targetsExpand
Estimating the odds of survival and identifying mitigation opportunities for common bycatch in pelagic longline fisheries
TLDR
Hooking survival rates and, therefore opportunities to reduce bycatch mortalities differed among the 10 species commonly discarded or released, where the odds of survival to the time of release are high and methods to reduce post-release mortality can be considered. Expand
survival of small-spotted catshark (scyliorhinus canicula) discarded by trawlers in the cantabrian sea
TLDR
No significant differences in survival-rates were found between males and females, and no strong relationships between survival-rate and depth fished, sorting time or trawl duration were evident. Expand
The survival of skates (Rajidae) caught by demersal trawlers fishing in UK waters
TLDR
The results indicate that discard mortality removes almost as many fish from the skate stock as are landed commercially in the Bristol Channel skate fishery. Expand
Capture time, size and hooking mortality of bottom longline-caught sharks
TLDR
Assessing the factors affecting mortality during longline capture for the four most abundant species that incurred at-vessel mortality in the U.S. Atlantic Ocean indicated that as hook time and shark size increased mortality rates for the sandbar and blacktip sharks increased. Expand
...
1
2
3
4
...