Discards in North Sea fisheries: causes, consequences and solutions

Discards refer to that part of the catch returned to the sea during fishing operations. This study assesses the consequences, causes, and potential solutions to the discard problem using the example of North Sea fisheries. Fishermen's immediate objectives during fishing operations and the low confidence in projected gains from discard reduction measures have promoted use of unselective trawls while the poor enforcement of the quota system has exacerbated discard quantities. It is concluded that a reduction in discard rates is required for a long-term solution to the ecological and economic costs of discarding and the development of fishing opportunity incentives can promote the use of more selective fishing techniques.

[1]  Michel J. Kaiser,et al.  The effects of fishing on marine ecosystems , 1998 .

[2]  M. Bergmann,et al.  Discard composition of the Nephrops fishery in the Clyde Sea area, Scotland , 2002 .

[3]  S. Greenstreet,et al.  Fishing effects in northeast Atlantic shelf seas : patterns in fishing effort, diversity and community structure. V. Changes in structure of the North Sea groundfish species assemblage between 1925 and 1996 , 1999 .

[4]  C. J. Camphuysen,et al.  The impacts of fishing on marine birds , 2000 .

[5]  Michel J. Kaiser,et al.  Fish scavenging behaviour in recently trawled areas , 1994 .

[6]  Stephen T. Buckland,et al.  A PPS sample survey of English fishing vessels to estimate discarding and retention of North Sea cod, haddock, and whiting , 2002 .

[7]  Stefan Groenewold,et al.  Effects on benthic scavengers of discards and damaged benthos produced by the beam-trawl fishery in the southern North Sea , 2000 .

[8]  B. Marlen Technical modifications to reduce the by-catches and impacts of bottom-fishing gears , 2000 .

[9]  J. Hislop,et al.  Ecology of North Sea fish , 1990 .

[10]  Colin Clark,et al.  Marine Reserves: from Beverton and Holt to the Present , 1998, Reviews in Fish Biology and Fisheries.

[11]  A. Gillespie Wasting the Oceans: Searching for Principles to Control Bycatch in International Law , 2002 .

[12]  R. Hughes,et al.  Consumption of fisheries discards by benthic scavengers : utilization of energy subsidies in different marine habitats , 1997 .

[13]  S. Stead,et al.  Days at sea: from the fishers’ mouths , 2003 .

[14]  R. Gibson Days at Sea , 1974 .

[15]  R. G. Halliday,et al.  A review of the scientific and technical bases for policies on the capture of small fish in North Atlantic groundfish fisheries , 2002 .

[16]  I. Clucas,et al.  A study of the options for utilization of bycatch and discards from marine capture fisheries , 1997 .

[17]  M. Kaiser,et al.  Opportunistic feeding by dabs within areas of trawl disturbance: possible implications for increased survival , 1997 .

[18]  R. J. Fryer,et al.  Discarding practices for commercial gadoids in the North Sea , 1998 .

[19]  Simon Jennings,et al.  Structural change in an exploited fish community: a consequence of differential fishing effects on species with contrasting life histories , 1999 .

[20]  F. Sardà,et al.  Influence of environmental factors on commercial trawl catches of Nephrops norvegicus (L.) , 2001 .

[21]  Johanna J. Heymans,et al.  Hundred‐year decline of North Atlantic predatory fishes , 2003 .

[22]  P. Moore,et al.  The behavioural ecology of epibenthic scavenging invertebrates in the Clyde Sea area: laboratory experiments on attractions to bait in moving water, underwater TV observation in situ and general conclusions , 1992 .

[23]  E. K. Pikitch,et al.  Dynamic discarding decisions: foraging theory for high-grading in a trawl fishery , 1995 .

[24]  J. Hunter,et al.  Composition and fate of the catch and bycatch in the Farne Deep (North Sea) Nephrops fishery , 1994 .

[25]  D. Symes,et al.  The discards problem: towards a European solution , 1994 .

[26]  Stefan Garthe,et al.  Amounts of discards by commercial fisheries and their significance as food for seabirds in the North Sea , 1996 .

[27]  D. L. Aiverson Some observations on the science of Bycatch , 1999 .

[28]  A. Mcintyre,et al.  Effects of Fishing on Non-target Species and Habitats , 2003 .

[29]  R. Furness Will Reduced Discarding Help or Harm Seabird Populations , 1999 .

[30]  H. Lindeboom,et al.  Impact-II: The effects of different types of fisheries on the North Sea and Irish Sea benthic ecosystems , 1998 .

[31]  J. Pope,et al.  An evaluation of the stock structure of North Sea cod, haddock, and whiting since 1920, together with a consideration of the impacts of fisheries and predation effects on their biomass and recruitment , 1996 .

[32]  John Willy Valdemarsen,et al.  Selectivity experiments with square mesh codends in bottom trawl , 1986 .