We augment discussions about the Good Environmental Status of the North Sea by developing two extreme visions and assessing their societal benefits. One vision ('Then') assumes restoration of benthic functioning; we contend that trawling had already degraded the southern North Sea a century ago. Available information is used to speculate about benthic functioning in a relatively undisturbed sou...

Simultaneous trawling at surface and at depth at one location off the Columbia River, Oregon, in June 2000 identified the depth distribution of juvenile salmonids and associated fishes. Juvenile salmon off the Columbia River were distributed primarily near the surface, within the upper 12 m. Highest densities of subyearling chinook salmon (Oncorhynchus tshawytscha) off the Columbia River were a...

Imagery has become a key tool for assessing deep-sea megafaunal biodiversity, historically based on physical sampling using fishing gears. Image datasets provide quantitative and repeatable estimates, small-scale spatial patterns habitat descriptions. However, taxon identification from images is challenging often relies morphotypes without considering taxonomic framework. Taxon particularly in ...

From 1 June 2010 in the Italian coastal waters of Northern Adriatic Sea, trawl fishery within three nautical miles became banned. This activity was previously allowed for some species as an exception to legislation. In order evaluate consequences both on demersal resources and economic yields which will oblige fishermen beyond miles, a pilot study performed. Twenty hauls comparing catch discard...

Abundance indices ofyoung fish in the North Sea derived from the International Bottom Trawl Survey (JBTS) show large interannual fluctuations, which are not in accordance with ICES assessments in every case. The standard estimation of the abundance indices, however, does not explicitly account for potential influences of environmental variables on the spatial aggregation of juvenile fish and th...

Web community is intensely studied in web resource discovery. Many literatures use core as the signature of a community. A core is a complete bipartite graphs, denoted as Ci,j. But discovery of all possible Ci,j in the web is a challenging job. This work has been investigated by trawling [1][2]. Trawling employs repeated elimination/generation procedure until the graph is pruned to a satisfied ...

The necessity to move from a traditional fishery management to an ecosystem approach is now acknowledged. Indicators are required to support the development of this approach. For example, community indicators have been proposed to assess the impact of fishing. We tested here the applicability of one such community indicator, the abundance-biomass comparison (ABC method), as a measure of the imp...