Topic
Dredging
About: Dredging is a research topic. Over the lifetime, 3300 publications have been published within this topic receiving 28325 citations.
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TL;DR: The impact of scallop dredging on benthic megafauna was assessed by direct observation of damage, both in the bycatch and in organisms encountering dredges but not captured as mentioned in this paper.
Abstract: The impact of scallop dredging on benthic megafauna was assessed by direct observation of damage, both in the bycatch and in organisms encountering dredges but not captured. Damage was assessed using a simple 4- point scale adapted for different taxonomic groups. Experi- mental dredging was undertaken on a scallop fishing ground in the north Irish Sea, off the Isle of Man. Divers were deployed immediately after dredges had passed, to record levels of damage to megafauna left in the dredge tracks. Mean damage levels, and the proportions of the 4 damage scores in the bycatch and on the seabed, were the same in most species. Some common species did show differences. The edible crab Cancer pagurus was more severely damaged when not captured, while the starfish Asterias rubens and whelk Neptunea antiqua received greater damage within the bycatch. Capture efficiency for the megafauna was low, rang- ing from 2 to 25% among species. The results indicate that the majority of damage to large benthic invertebrates during scallop dredging occurs unobserved on the seabed, rather than in the bycatch.
77 citations
Journal Article•
76 citations
TL;DR: The use of fishing gears has increased globally since the 1950s when it accounted for more than 40% of reported catches to a peak in most areas such as North America and Europe in the 1980s.
76 citations
Book•
01 Nov 1979
TL;DR: The second edition of this highly successful book, which covers all aspects of modern dredging including operating methods, outputs, costs, contracts and environmental impact, has been fully updated and expanded.
Abstract: The second edition of this highly successful book, which covers all aspects of modern dredging including operating methods, outputs, costs, contracts and environmental impact, has been fully updated and expanded. New material on site investigation, project implementation, and environmental aspects of dredging bring the book up-to-date. It instructs the reader in the planning and implementation of dredging projects, gives methods of estimating costs and gives a complete technical treatment of dredging. Illustrations and in-depth descriptions make this book accessible and easy-to-use.
76 citations
TL;DR: An ecosystem approach to study the complex effects of clam harvesting was implemented using a trophic mass-balance model, which constructed the present state of the Venice lagoon ecosystem and compared with models produced for a reconstructed past lagoon and a projected future lagoon.
Abstract: Harvesting of the invasive Manila clam, Tapes philippinarum, is the main exploitative activity in the Venice lagoon, but the mechanical dredges used in this free-access regime produce a considerable disturbance of the lagoon ecosystem. An ecosystem approach to study the complex effects of clam harvesting was implemented using a trophic mass-balance model. The trophic rela- tions in the ecosystem were quantified with a mixed trophic impact analysis and further evaluated by con- sidering different explanations for the ''Tapes paradox'', which consists of the apparent population enhancement of Manila clams by dredging and the apparent nutri- tional advantages that this species receives from re-sus- pended organic matter. The key-role played by this introduced species is highlighted by a network analysis that indicates a ''wasp-waist control'' of the system by Manila clams. The model constructed to characterise the present state of the Venice lagoon ecosystem is com- pared with models produced for a reconstructed past lagoon and a projected future lagoon. The future model was obtained by simulating the elimination of clam dredging in 10 years. The three different models were compared using thermodynamic and informational indices. Simulating the elimination of clam dredging produced a 33% increase in artisanal fishery catches, carried out by means of static gears, even with no change in fishing effort. These simulations also forecast an increase in the mean trophic level of the artisanal fishery catches as a positive effect of eliminating mechanical clam harvesting.
76 citations