Abstract
Atlantic salmon (Salmo salar L.) is, in France, a totemic species and a symbol of the quality of aquatic environment. Formerly, very abundant in numerous river basins entering the Channel or the Atlantic coast, this species, unfortunately, is declining since the beginning of the 20th century and particularly after the end of the 2nd World War. Presently, this anadromous fish migrates on 40 river systems located between the Belgium border and the Spanish one. Salmon is mainly exploited by rod anglers but there still exists a professional fishery in the Adour-Gaves basin (located in the South-West part of France) where salmon catches are allowed with drift net. In all other estuaries and coastal waters where they are not prohibited, salmon catches by (professional) fishermen remain incidental and very few. Commercial salmon fishing, whether targeted or accidental, is strictly regulated in France, including a fishing licensing regime specific to diadromous fish species.” The total catch is currently estimated to 10 metric tons around 3000 fish. The decline of Atlantic salmon in France is due to multiple anthropogenic pressures that have affected the size and the quality of its freshwater habitat during the 20th century such as: edification of dams on a great number of rivers for energy production or for agricultural and domestic purposes; increase of the water pollution with a degradation of the quality of the spawning areas; impediments to free migration due to an insufficient number of fish ladders or non effective fishways that prevent salmon to reach safely and rapidly their spawning areas. The final result is a large decrease of productivity of salmon stocks in most part of French salmon rivers and some difficulties to maintain a professional or leisure exploitation. Despite the ban of salmon catch in large river systems such as the Loire, Gironde, Seine, Garonne, Dordogne basins and the drastic decrease of the number of salmon fishers (presently less than 3000 for anglers and less than 30 for professional fishers), managers have some great difficulties to rebuild the population. Most of restoration programs failed due to a too fragmented approach without a global view of salmon needs; fishing regulations without improvement of salmon environment have limited effects on the stock restoration if the main cause of decline is the decrease of the quality of salmon habitat. So, the future of Atlantic salmon in France lies in the implementation of an ecosystemic approach in order to have perennial and significant effects on the abundance of this population. The examples of restoration programs undertaken in the Adour-Gaves basin or in small river systems such as the Elorn river in Brittany confirm the need for management plans including not only fishing regulations but also improvement of salmon environment. On the Adour-Gaves river system for example, a restoration program including regulation of fishery, improvement of the free migration of individuals for a better access to the best spawning areas located in the upper course of the salmon tributaries, has given significant results on the stock abundance and on the percentage of large spawners in the population.
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Notes
- 1.
There exists 25 salmon rivers 22 of which are a drainage area of less than 1000 km² (Valadou 2014)
- 2.
Ten year average since 2003
- 3.
Including a neighborhood river: The Nivelle river
- 4.
The Adour estuary is the only estuary where a professional fishery for salmon is allowed.
- 5.
In a succinct way, more the productivity level is high more the size of the territory is small and more the density of individuals is high.
- 6.
- 7.
We have taken this period because in the 19th century the salmon fishing was allowed from January to November and at the end of the 20th century, the drif net fishery was allowed from mid-March until the end of July.
- 8.
- 9.
Combined with the escapement value, this indicator provides an estimate of the total potential number of eggs available for the river basin. For example, according to MIGRADOUR (www.migradour.com), technical structure in charge of the Atlantic salmon counting in the Adour basin, 4483 salmons escaped the fisheries in 2010, so the egg deposition for that year could be estimated to 21 millions of eggs for the whole salmon basin.
- 10.
It’s also the case for others migratory fishes such as sea trout or shads.
- 11.
It was important for the managers to know the optimal duration of the total net hauling zone in the estuary and to see if a staggered hauling regime between the lower and upper estuary enabled the harvesting rate of the salmon population migrating into the estuary to be minimized for the same number of days of hauling.
- 12.
Speeds between 2 and 4 m/s during short periods of few seconds are not rare (Mahaut and Prouzet 2010).
- 13.
11.2 tons of which for private human consumption.
- 14.
Mainly the Adour estuary and the Bay of Mont Saint-Michel in Normandy.
- 15.
Difficult to explain as it was not linked to an increase of the salmon run in all the others French salmon rivers perhaps a possible consequence of a successful restocking.
- 16.
Without taking into account the numerous catches from the rod and line fishery that were sold also but not recorded.
- 17.
The marine fisheries statistics gave for the period 1901–1925 an average landing of 58.8 tons of salmon per year for the maritime French fishery; statistics not taking into account the salmon caught by the “baro” fisheries and by anglers. (after de Drouin de Bouville 1943)
- 18.
30 «baros» were registered at the end of the 19th century, 4 located on the Gaves caught a large number of salmon (Cuende and Prouzet 1992):Cauneille, Lahontan, Puyoo and Sordes.
- 19.
Around 4.5 tons, in 2013, for the Adour estuary.
- 20.
8,400 eggs per fish.
- 21.
We count 2,250 hydroelectric power stations in France and 75,000 dams of different kinds. This number was higher in the 19th century, around 100,000, but at that time watercourses formed the principal means of communication and transport and the rivers were maintained and the migratory species abundant due to the maintenance of the river continuity (Rabic et al. 2010).
- 22.
Annexe 3—rapport CREBS—INRA—sur les captures de poissons migrateurs dans les estuaires français depuis le milieu du 19ème siècle. 1987.
- 23.
Annexe 8—rapport CREBS—INRA—sur les captures de poissons migrateurs dans les estuaires français depuis le milieu du 19ème siècle. 1987.
- 24.
Less than 30 fishers catch salmon if we add the inland professional fishers with a social status of farmers and who have the right to fish in the fluvial part of the estuary (39 fishing licenses have been attributed in 2015).
- 25.
The “baro” was banned in 1926 on the Adour-Gaves basin; the purse seine was banned in 1978; the rod and line is now used only for the recreational fishery and the salmon sale is prohibited for the leisure fishery.
- 26.
To catch mullets, melgrim, migratory salmonids, shads, sea lamprey, sea bass, spotted sea bass.
- 27.
The number of salmon incidental caught by gill nets along the coast is difficult to estimate, perhaps a few hundred.
- 28.
In 2002, a report on the salmon migration on the Aulne river showed that only 5% of the spawners were able to migrate on the upper part of this river where 73% of the production areas for juvenile were located (Croze et al. 2002).
- 29.
Prouzet—non published data. The total number of salmon caught in the tidal pond from 1983 to 1985 was 61 fish from a release of 40,614 smolts (rate of return 0.15%).
- 30.
Over maturation for the spawner migrating towards spawning areas located far from the mouth (e.g. Allier river) or delayed of the downstream migration of smolts with an increase mortality during the sea water transfer.
- 31.
It is the reason of the failure of the salmon restoration in the large salmon system in France.
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Prouzet, P., Michelet, N. (2019). Ecological Status of Atlantic Salmon (Salmo Salar L.) in France: Need for an Ecosystemic Approach. In: Komatsu, T., Ceccaldi, HJ., Yoshida, J., Prouzet, P., Henocque, Y. (eds) Oceanography Challenges to Future Earth. Springer, Cham. https://doi.org/10.1007/978-3-030-00138-4_20
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