Guide of TOTAL FISHING

Effects of Trawling and Dredging on Seafloor Habitat
18-29 4 Habitat Mapping and Distribution of Fishing Effort, pp.
Most studies on the effects of fishing gear on the seafloor have been focused on trawl and dredge fisheries.
coastal waters bottom is made with contact, mobile fishing gear.
Other gear, such as pelagic trawls and seines, are not included in this chapter because they either have less contact with the seafloor or they represent a minor fraction of the total fishing effort..
Fishing gear that is dragged over the seabed or through the water is called mobile gear.
All bottom-contact, mobile fishing gear disturbs the seafloor to some extent.
It is classified as active fishing gear because the animals do not voluntarily enter the gear; they are either swept up from the seabed or netted from the water by the gear.
Improvements in fishing vessel electronic navigation equipment from radio direction finders (LORAN), collision avoidance equipment, radar, and finally satellite-based navigation, such as global positioning systems (GPS), have increased fishing efficiency.
By 1971, trawling was considered “a most efficient method of offshore fishing” (Shapiro, 1971).
Although trawl fishing also spread along the Pacific coast, the relatively narrow continental shelf and limited West Coast markets led to establishment of a smallboat fishery (generally less than 25 m in length) until the advent in the late 1960s of foreign fisheries..


TOTAL FISHING

Effort reduction
Advice from ICES to fisheries managers in north-west European waters has long recommended reductions in overall fishing effort as too many fish are being killed for the long-term sustainability of fish stocks.
An overall aim would be to balance total fishing effort on a particular fish stock at a level that matches the surplus stock that can be taken on a sustainable basis, i.e.
Since total fishing effort is a product of the number of vessels multiplied by the number of days that they go fishing, it is possible to reduce effort by either reducing the number of vessels in a fishery, or the number of days that vessels may go fishing (or both).
Such vessel and gear improvements are called 'technical creep' and are estimated by some sources to have amounted to an improvement of 4% per year in catching power of Europe's fishing fleet over recent years.

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