Shell damage and mortality in the common whelk Buccinum undatum caused by beam trawl fishery

Mensink, B.P.; Fischer, Cornelius; Cadée, Gerhard C.; Fonds, M.; Hallers-Tjabbes, Cato C. ten; Boon, Jan P.

doi:10.1016/s1385-1101(00)00003-4

Cited by 31 publications

(22 citation statements)

References 20 publications

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“…The more brittle-shelled whelk species B. undatum sustained higher frequencies of mild and medium damage but injury was less severe than has been reported in whelks caught by beam trawls in the North Sea (Mensink et al, 2000). Since the survival of whelks discarded in the Nephrops ®shery is high (Bergmann, 2000) and B. undatum can repair chipping damage within six weeks (Mensink et al, 2000), the resulting shell scars could possibly be utilised to indicate past ®shing intensity, similar to an approach taken by Witbaard and Klein (1994) and Kaiser et al (2000) using scars on bivalve shells.…”

Section: Damage To Molluscsmentioning

confidence: 62%

Damage sustained by epibenthic invertebrates discarded in the Nephrops fishery of the Clyde Sea area, Scotland

Bergmann¹,

Beare

Moore³

2001

Journal of Sea Research

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The Clyde Sea Nephrops ®shery produces ca. 25 000 t y 21 discards with invertebrates accounting for up to 90% of the number of animals discarded. Trawling and handling of the (by-)catch often results in physical injury, the extent of which was previously unknown. Damage sustained by invertebrate discards was assessed following commercial trawling (of 62±270 min duration) and sorting on deck. Brittlestars Ophiura ophiura were most vulnerable with 100% incurring damage, followed by squat lobsters Munida rugosa (57%) and star®sh Astropecten irregularis (56%). Harder-shelled species such as hermit crabs Pagurus bernhardus and queen scallops Aequipecten opercularis sustained fewer injuries (14 and 2%, respectively). Shell chipping, loss and damage of limbs were the most frequent types of injury incurred. The severity and frequency of damage was mainly correlated with species-speci®c morphological and behavioural characteristics. Vessel type, tow duration and animal size had a major in¯uence on damage to the epibenthic invertebrates caught. While damage may potentially be repaired, survival is adversely affected and sublethal effects might signi®cantly impair ®tness of frequently trawled individuals and populations. q

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Section: Damage To Molluscsmentioning

confidence: 62%

Damage sustained by epibenthic invertebrates discarded in the Nephrops fishery of the Clyde Sea area, Scotland

Bergmann¹,

Beare

Moore³

2001

Journal of Sea Research

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“…Investigations by means of experimental trawling and empirical data showed that trawl fisheries increase the mortality of benthic species not caught in the nets but which are damaged by the passing gear (Bergman & van Santbrink, 2000;Mensink et al, 2000;Callaway et al, 2007;Rabaut et al, 2008). Moreover, fishing indirectly affects benthic communities by disturbing the sediment, altering seabed morphology, and increasing suspend solids in the water column (Watling, 2005), while individuals not killed may be left at the surface, increasing food availability for scavenging species (Frid et al, 1999).…”

Section: Discussionmentioning

confidence: 99%

Long-term changes in the spiny dogfish (Squalus acanthias) trophic role in the southwestern Atlantic

et al. 2011

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We used a comprehensive dataset on the diet of Squalus acanthias in the southwestern Atlantic Ocean (35-55°S) to test the hypothesis that fishery has caused a decrease in the trophic level of this species (fishing down process). Of 3,644 stomachs examined between the years 1985 and 2010, 2,214 (60.77%) contained prey items. Generalized linear models were used to evaluate the support in our data for five explanatory variables (sex, predator's total length, season, region and decade) that may explain the consumption of the given prey. The frequency of fish, mainly Merluccius hubbsi, and benthos in the stomachs decreased through time, whereas the squid Illex argentinus and jellyfishes exhibited positive trends. The trophic level of S. acanthias declined from the 1980s to the 1990s due to the high consumption of prey items at lower trophic levels. On the other hand, the consumption of argentine anchovy, Engraulis anchoita, an underexploited species, did not reveal changes through time.

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“…We expect that those species that live within reach of the tickler chains, and that are not robust, will suffer significant fishing mortalities. Moreover, Mensink et al (2000) conclude that even a robust species like the common whelk (Buccinum undatum) suffers considerable fisheries-induced mortality, because about 55% of the animals caught in a 12 m beam trawl died within six weeks.…”

Section: Discussionmentioning

confidence: 99%

Mortality in megafaunal benthic populations caused by trawl fisheries on the Dutch continental shelf in the North Sea in 1994

Bergman

2000

ICES Journal of Marine Science

127

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We estimated the direct mortality of benthic fauna caused by one single passage of commercial beam and otter trawls in field experiments. The benthos dredge Triple-D was used to sample megafauna (>1 cm), while macrofauna (>1 mm) were sampled by means of a Reineck boxcorer and, in some cases, a van Veen grab. Direct mortalities ranging from about 5 up to 40% of the initial densities were observed for a number of gastropods, starfishes, small and medium-sized crustaceans, and annelid worms. For bivalve species, direct mortalities were found from about 20 up to 65%. Mortality per m 2 trawled area due to fishing with a 12-m beam trawl was not higher than that due to a 4-m beam trawl. For all species considered, the direct mortality was largely attributed to animals that died in the trawl track, either as a direct result of physical damage inflicted by the passage of the trawl or indirectly owing to disturbance, exposure, and subsequent predation. In 1994, the 12 m beam trawl with tickler chains was the dominant gear type in the Dutch sector, resulting in a mean annual trawling frequency of 1.23. The mean annual trawling frequencies with the 4 m beam trawl using tickler chains, the 4 m beam trawl with a chain mat, and the otter trawl were 0.13, 0.01, and 0.06, respectively. The annual fishing mortality in invertebrate megafaunal populations in the Dutch sector ranged from 5 up to 39%, with half of the species showing values of more than 20%. For all species studied, the 12 m beam-trawl fisheries caused higher annual fishing mortalities than the concerted action of the other fisheries. Only with respect to species restricted to sandy coastal areas did the 4 m beam-trawl fleet contribute substantially to the annual mortality. Implications of the impact of trawling on the composition of benthic communities are discussed. International Council for the Exploration of the SeaKey words: direct mortality of trawling, fishing mortality, impact of beam trawling, impact of otter trawling, megafauna.

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Shell damage and mortality in the common whelk Buccinum undatum caused by beam trawl fishery

Cited by 31 publications

References 20 publications

Damage sustained by epibenthic invertebrates discarded in the Nephrops fishery of the Clyde Sea area, Scotland

Damage sustained by epibenthic invertebrates discarded in the Nephrops fishery of the Clyde Sea area, Scotland

Long-term changes in the spiny dogfish (Squalus acanthias) trophic role in the southwestern Atlantic

Mortality in megafaunal benthic populations caused by trawl fisheries on the Dutch continental shelf in the North Sea in 1994

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