If fish could break through dams... Cartoon: Seppo.net
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1 World Fish Migration Day 2018: Connecting Fish, Rivers and People Migration is an instinctive phenomenon present in many fish species which migrate between the sea and the rivers to reproduce, feed, and complete their life cycles. Unfortunately, during their migration, many migratory fish species are severely threatened. Every migration involves a wide range of threats, often caused by manmade obstacles, including dams, weirs, and sluices, which disrupt the natural flow of rivers and prevent successful migration. If they cannot reach their breeding ground, the species will decline and eventually become extinct. If fish could break through dams... Cartoon: Seppo.net On 21 April, we celebrate World Fish Migration Day (WFMD), which aims to recover healthy rivers and prevent future degradation and species extinction. Migratory fish make up a crucial link in the food chain and play an important role in healthy and productive river systems. Furthermore they provide an important food supply and livelihood for millions of people around the world.
2 On WFMD, many activities such as workshops on fish passage management and river visit programs are organized, united by a common theme Connecting Fish, Rivers and People. WFMD aims to improve environmental conditions, which we owe to future generations, and to ensure the sustenance of the millions of human lives that depend on rivers. In order to accomplish this brighter future, we need to start by educating people and raising awareness of the current situation as well as of the potential solutions to the problems. Protecting migratory fish starts by protecting wetland habitats Wetlands are very important in life cycle of fish across the world. Healthy wetlands are vital to the survival of most fish species because they fulfill their essential needs: - Fish and shellfish feed on plants and other organic matter that exist in wetlands. - Wetlands provide vegetated areas where fish can reproduce. They are also suitable spawning and nursery areas for fish by hiding eggs among wetland edges and underwater grasses. - Wetland vegetation provides shelter from predators and from inclement weather. - Wetlands provide clean water that fish need because of its function of filtering water by removing sediments and pollutants that could kill fish and amphibian eggs. - Wetlands represent the connection from the rivers to the sea, and healthy and connected wetlands allow successful migration through them. Declining wetlands, declining fish habitat The unwise use of wetlands, their loss and their degradation have negative impacts on fish populations. As the wetland habitats are drained or altered, it becomes more difficult for fish to find the habitats they need to survive. Wetland degradation is a serious problem for fish in many forms, and in particular: - The lack of habitat such as forested wetlands, beaver ponds, and stream pools is a factor limiting the survival of some fish species. - The loss of wetland vegetation causes a decline in fish populations that need cover to hide from predators. - Declining wetland habitat may result in the listing of fish under the list of Endangered Species. - Loss of the continuity of the rivers brings about a decline in the migratory fish populations.
3 Anguilla managing natural fish passage... Cartoon: Seppo.net More information Website of World fish migration day Watch the official teaser of World Fish Migration Day 2018 Download the nice Swimway poster. Download the WFMD 2016 report Contact A focus in the Mediterranean Human activities cause wetland degradation and loss by pollution, habitat destruction, and the introduction and subsequent population explosions of non-native species. All this has brought us to a point where the Mediterranean region, according to the International Union for Conservation of Nature (IUCN), risks losing 56% of endemic freshwater fish, 36% of freshwater crabs and crayfish, 29% of amphibians, and 19% of dragonflies during the next decades. Trends in wetland biodiversity are particularly bad in the Eastern Mediterranean (IUCN report: the Mediterranean: a biodiversity hotspot under threat). Freshwater fishes represent a group of species particularly little known by the wide public in the Mediterranean basin. Mediterranean rivers and lakes are host to 595 species of fish, half of which
4 are endemic (253), sometimes in only one river basin (Source IUCN Med, The status and distribution of freshwater fish endemic to the Mediterranean basin (2006)). Fish Species Map of the Mediterranean Basin (MWO ; IUCN Red List) According to the IUCN Red List, the conservation status of this group of species is of particular concern: 38% of the totals are threatened (CR+ EN+VU). Human activities have already resulted in the permanent extinction of 12 species of fish in the region. Among the identified threats are the alteration of the hydrological functioning of watercourses following the construction of dams and irregular rainfall in a context of climate change, drainage of wetlands, water pollution, and introduction of exotic fish species EX 83 CR EN VU NT LC 32 DD
5 Relative proportion of Mediterranean freshwater fish species according to their conservation status (IUCN Red List, MWO, 2018): EX = extinct; CR = critically endangered; EN = in danger; VU = vulnerable; NT = near-threatened; LC = least concern; DD = Data Deficient. Migratory species such as shad, lampreys and eels transiting between rivers and the sea to complete their life cycle are particularly threatened by the alteration of the ecological continuity of rivers. Locks and dams, particularly numerous on Mediterranean rivers and streams, affect the flow downstream of these structures, modify riparian habitats (important for aquatic fauna), and prevent migratory fish such as shad from reaching their spawning sites. Some key species in the Mediterranean Sea Lamprey (Petromyzon marinus). Credit Cyril Girard - copyright editions Mediterraneus- extracted from the "guide illustré de la faune de Méditerranée" Lampreys live mostly in coastal and fresh waters in temperate areas and are migratory and anadromous. Anadromous means that the fish migrates from the sea up into fresh water to spawn, such as salmon, striped bass, and the sea lamprey. The Sea Lamprey is threatened by the fragmentation of rivers, dredging and sediment pollution, and especially in the Mediterranean basin they are considered rare and vulnerable. Read more here:
6 The twaite shad (Alosa fallax) is a species of fish in the Clupeidae family. Credit Cyril Girard - copyright editions Mediterraneus- extracted from the "guide illustré de la faune de Méditerranée" It is found in the eastern Atlantic Ocean and the Mediterranean Sea and is an anadromous fish which lives in the sea but migrates into fresh water to spawn. Multiple anthropogenic-driven alterations of the watershed (mainly dams), impoundment of large rivers throughout Europe, and water pollution have caused a severe decline of the species. Most populations declined during the first decades of 20th century. Read more here: European eel (Anguilla Anguilla). Credit Cyril Girard - copyright editions Mediterraneus- extracted from the "guide illustré de la faune de Méditerranée" The European eel (Anguilla anguilla) is a species of eel, a snake-like, catadromous fish. Catadromous means that the fish migrates from fresh water down into the sea, such as eels.
7 The European eel is a critically endangered species (Red List category). Since the 1970s, the numbers of eels reaching Europe are thought to have declined by around 90% (possibly even 98%). Contributing factors include overfishing both juveniles (glass eels) and adults, organic pollution and heavy metals, a nematode parasite (Anguillocola crassus), and barriers to migration such as hydroelectric dams. Read more here: Download the European eel brochure (French) published by the Tour du Valat. Some key projects in the Mediterranean A Life Project in Spain, Ebre Delta: LIFE MIGRATOEBRE LIFE MIGRATOEBRE project Migratory fish recovery and improved management in the final stretch of the Ebre River is a best practices and demonstration project for final stretches of major European rivers. The project is based on the implementation of mitigation measures in relation to rivers, hydromorphology improvement, especially on rivers ecological connectivity, and fish passage issues associated by the Water Framework Directive and the European Eel Recovery Plan (Regulation 1100/2007). At the same time, investments will be made in Natura 2000 sites and on species and habitats targeted by Habitats Directive conservation, at local and regional levels. Website of the project: Read the flyer of the project. Watch the video presenting the project Read a scientific article on the eel s migration in the Mediterranean: First evidence of European eels exiting the Mediterranean Sea during their spawning migration The migration route and the spawning site of the European eel (Anguilla anguilla) are still uncertain. It has been suggested that the Mediterranean eel stock does not contribute to spawning because there is no evidence of eels leaving the Mediterranean Sea. To test this hypothesis, researchers equipped eight female silver eels from the south of France with pop-up satellite tags during their escape from coastal waters. Once in deeper water, the eels quickly established their migration; five tagged eels were taken by predators within the Mediterranean, but two eels reached the Atlantic Ocean after six months and at distances greater than 2000 km from their release. These eels reached the Gibraltar Strait, and remained in deep water until they reached the Atlantic Ocean.
8 Fig: Map of the western Mediterranean Sea and Eastern Atlantic Ocean, showing the approximate tracks of the individual tagged eels, based on a restricted number longitude and latitude estimates. These results are the first to show that eels from the Mediterranean can cross the Strait of Gibraltar and continue their migration into the Atlantic Ocean. This finding suggests that Mediterranean countries, as for other EU states, have an important role to play in contributing to conservation efforts for the recovery of the European eel stock. Read the whole scientific article on the eel s migration in the Mediterranean here. For further information, please contact Elsa Amilhat, CEFREM, at elsa.amilhat@univ-perp.fr. FOCUS ON THE RHÔNE In order to preserve populations of amphihaline migratory fish, i.e., those whose life cycle alternates between the marine environment and a fresh water environment, knowledge of the state of the species and their living environment is fundamental. Migrateurs Rhône Méditerranée (MRM) launched the Rhône-Mediterranean amphipathic migratory fish observatory. Through synthetic descriptors obtained thanks to biological monitoring, the observatory is a support for decision-making and the orientation of the management policies of highly migratory fish populations in the Rhône-Mediterranean basin. It is also a tool for disseminating information to the general public and professionals working in the field of biodiversity. For a look back at eight years of research in the Mediterranean on the eel repopulation in the Camargue with the Marshes of Vigueirat, MRM and Tour du Valat, see the brochure of eel repopulation here (in French).
9 For further reading Freshwater Key Biodiversity Areas in the north-western Mediterranean sub-region (2017) Author(s): Máiz-Tomé, L.; Darwall, W.R.T.; Numa, C.; Barrios, V.; Smith, K. G. Organization(s): IUCN Centre for Mediterranean Cooperation - IUCN Global Species Programme - IUCN Species Survival Commission (SSC) Freshwater key biodiversity areas in the Mediterranean basin hotspot (2014) Author(s): Barrios, V.; Carrizo, S.; Darwall, W.; Freyhof, Jörg; Numa, C.; Smith, K. G. Organization(s): IUCN - Critical Ecosystem Patrnership Fund - Fondation MAVA pour la nature - IUCN Species Survival Commission (SSC) - IUCN Centre for Mediterranean Cooperation The status and distribution of freshwater biodiversity in the eastern Mediterranean (2014) Author(s): Barrios, V.; Darwall, W.R.T.; Numa, C.; Smith, K. G. Organization(s): Cambridge, UK, Malaga, Spain and Gland, Switzerland The Status and Distribution of Freshwater Biodiversity in Northern Africa (2010) Author(s): García, N.; Cuttelod, A.; Abdul Malak, D. Organization(s): IUCN, Gland, Switzerland, Cambridge, UK, and Malaga (Spain) The status and distribution of freshwater fish endemic to the Mediterranean basin (2006) Author(s): Darwall, W.R.T.; Smith, K. G. Organization(s): IUCN Species Survival Commission (SSC), Freshwater Biodiversity Assessment Programme - IUCN Centre for Mediterranean Cooperation Overview of the Conservation Status of the Marine Fishes of the Mediterranean Sea (2011) Author(s): Abdul Malak, D. et al. Organization(s): Gland, Switzerland and Malaga, Spain: IUCN. Other Projects Black Sea: LIFE for the sturgeons of the Danube: North Sea: River Rhine : Estonia: 19.htm
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