Tag Archives: bottom trawling.

Bottom trawling for orange roughy has scientists worried

Three of the nine fisheries within New Zealand waters were recently deemed sustainable once again. But it is bottom-trawling for orange roughy on the high seas – the area out beyond the 12 nautical mile limit of New Zealand and Australia’s exclusive economic zone – that has scientists and conservationists worried.,,  Experts call them “vulnerable marine eco-systems” (VMEs) but some in the fishing industry even object to the term as “unscientific and akin to labelling fishermen as murderers”. These tensions led to protracted wrangling about how best to protect the South Pacific’s orange roughy and that has now culminated in threats of legal action from New Zealand’s powerful fishing industry interests. >click to read<13:45

Study Reviews Trawler Effects on Seabed

An international group has taken a close look at how different types of bottom trawling affect the seabed. It finds that all trawling is not created equal — the most benign type removes 6 percent of the animal and plant life on the seabed each time the net passes, while the most other methods remove closer to a third. A University of Washington professor is among the main authors on the study, led by Bangor University in the U.K. and published July 17 in the Proceedings of the National Academy of Sciences. The meta-analysis looks at 70 previous studies of bottom trawling, most in the Eastern U.S. and Western Europe. It looks across those studies to compare the effects on the seabed of four techniques: otter trawling, a common method that uses two “doors” towed vertically in the water or along the bottom to hold the net open; beam trawls, which hold the net open with a heavy metal beam; towed dredges, which drag a flat or toothed metal bar directly along the seafloor; and hydraulic dredges, which use water to loosen the seabed and collect animals that live in the sediment. click here to read the story 16:04

The Impacts of Trawling in the North Sea are Overrated

CFOODA new study by Ferdinand Oberle, Curt Storlazzi, and Till Hanebuth attempted to quantify the global impact of bottom trawling on continental shelf. It presents a high-resolution, one-year, spatial record of ground-penetrating fishing activities, namely otter trawling (referred to as bottom-trawling in the paper) on the NW-Iberian shelf, and calculates the resuspended sediment load caused by the operations of this fleet. The authors also challenge conclusions from papers like Kaiser et al 2006 that suggest trawling affected seabed hotspots are rare. To this end the authors found NW Iberian shelf areas to be experiencing trawling on average 5.9 times per annum compared to less than 1 in previous studies.  Read the rest here 21:18

NAFO urged to protect deep sea species – Environmentalists working to mitigate damage done by bottom trawling

“We want NAFO to mitigate the effects of bottom trawling and protect areas with coral and sponges,” said Susanna Fuller, marine conservation co-ordinator with Halifax’s Ecology Action Centre, in an interview Friday. Fuller, who is also treasurer of the 70-member Deep Sea Conservation Coalition, plans to be an observer at the 36th annual meeting of the organization that runs Monday through Friday in Vigo, Spain. Read the rest here 14:37

Bottom trawling may be good for fish, study suggests

“What we found is that the indirect effects or side-effects of trawling — namely, the sort of selective removal of certain types of bottom life — sort of makes the system more productive in terms of food for the fish that fishermen target,” said Tobias Van Kooten, one of three authors of the report, along with Daniel van Denderen and Adriaan Rijnsdorp. [email protected]  06:54

Read To fish or not to fishBy Colin Ricketts