Long-term changes in deep-water fish populations in the northeast Atlantic: a deeper reaching effect of fisheries?
- 11 March 2009
- journal article
- research article
- Published by The Royal Society in Proceedings. Biological sciences
- Vol. 276 (1664), 1965-1969
- https://doi.org/10.1098/rspb.2009.0098
Abstract
A severe scarcity of life history and population data for deep-water fishes is a major impediment to successful fisheries management. Long-term data for non-target species and those living deeper than the fishing grounds are particularly rare. We analysed a unique dataset of scientific trawls made from 1977 to 1989 and from 1997 to 2002, at depths from 800 to 4800 m. Over this time, overall fish abundance fell significantly at all depths from 800 to 2500 m, considerably deeper than the maximum depth of commercial fishing (approx. 1600 m). Changes in abundance were significantly larger in species whose ranges fell at least partly within fished depths and did not appear to be consistent with any natural factors such as changes in fluxes from the surface or the abundance of potential prey. If the observed decreases in abundance are due to fishing, then its effects now extend into the lower bathyal zone, resulting in declines in areas that have been previously thought to be unaffected. A possible mechanism is impacts on the shallow parts of the ranges of fish species, resulting in declines in abundance in the lower parts of their ranges. This unexpected phenomenon has important consequences for fisheries and marine reserve management, as this would indicate that the impacts of fisheries can be transmitted into deep offshore areas that are neither routinely monitored nor considered as part of the managed fishery areas.This publication has 18 references indexed in Scilit:
- Predicting ecological consequences of marine top predator declinesTrends in Ecology & Evolution, 2008
- LONG-TERM CHANGE IN BENTHOPELAGIC FISH ABUNDANCE IN THE ABYSSAL NORTHEAST PACIFIC OCEANEcology, 2006
- Deep-sea fishes qualify as endangeredNature, 2006
- Trends in body size across an environmental gradient: A differential response in scavenging and non-scavenging demersal deep-sea fishProceedings. Biological sciences, 2005
- Long-term and regional variability of phytoplankton biomass in the Northeast Atlantic (1960–1995)ICES Journal of Marine Science, 2001
- Long-term change in the megabenthos of the Porcupine Abyssal Plain (NE Atlantic)Progress in Oceanography, 2001
- Continental slope and deep-sea fisheries: implications for a fragile ecosystemICES Journal of Marine Science, 2000
- Effects of bottom fishing on the benthic megafauna of Georges BankMarine Ecology Progress Series, 1997
- A comparison of the deep-water demersal fish assemblages of the Rockall Trough and Porcupine Seabight, eastern North Atlantic: continental slope to riseJournal of Fish Biology, 1996
- Summary atlas of deep-living demersal fishes in the North Atlantic BasinJournal of Natural History, 1988