The nine priority areas to restock the Mediterranean
Tempo di lettura: 6minuti
Urgent call for action on the eve of the Ministerial Conference on Mediterranean Fisheries
Malta, 28 March 2017. “There are at least nine areas in the Mediterranean that need protection as a matter of priority in order to safeguard marine ecosystems and contribute to the recovery of fish stocks, starting with the central Adriatic where Italy and Croazia must soon state their positions regarding the protection of the Jakuba/Pomo Pit.” This is the call of MedReAct on the eve of the Ministerial Conference on Mediterranean Fisheries organised by the European Commission, taking place in Malta 29 and 30 March 2017. This area, which lies between Italy and Croatia, reaches a maximum depth of 200-260 metres, and has unique geomorphological and oceanographic features. It suffers severe impacts from bottom trawling which over the years has greatly reduced Adriatic fish stocks. This fishing method represents a serious threat to one of the most important nursery and spawning zones for European hake and Norway lobster (for more details see the attached briefing document). A proposal for its protection is currently being examined by the General Fisheries Commission for the Mediterranean which will express its position in the coming months.
The Malta conference, in which sixteen ministers from Mediterranean countries will participate, will conclude with the signing of the Malta MedFish4Ever declaration, committing Mediterranean countries to protect vulnerable species and sensitive habitats and to establish fisheries restricted zones and marine protected areas. By 2020 the coastal states must achieve protection of 10% of the Mediterranean Sea, in line with the sustainable development goals of the United Nations and the Convention on Biological Diversity. “Protection of the Jakuba Pomo Pit represents an important testing ground on which to verify the level of political will to restore vulnerable marine areas and fish stocks and to save the future of Adriatic fisheries,” declared MedReAct spokesperson Domitilla Senni. “We call on Italy and Croatia to make a public commitment at the Malta Ministerial Conference to protect this area from bottom trawling.”
In addition to the Pomo Pit, MedReAct draws attention to eight other priority areas requiring protection measures:
Northern Sicilian Seamounts
Gulf of Lion Slope
Alboran Sea Seamounts
Western Sardinia Canyons
Southern Ligurian Seamounts
Aegean Sea – the Thracian Sea
Each of these areas is described below.
Priority areas in the Mediterranean Sea
Northern Sicilian Seamounts. Located off the northwest coast of Sicily, the area includes two seamounts each of about 1000 meters, called Aceste and Drepano, as well as the Ustica ridge and escarpment. Aceste, characterized by the presence of black corals (Antipatharia) and scleractinians (Dendrophyllia cornigera), is an area of high importance for elasmobranchs, especially sharks, and in particular the great white shark (Carcharodon carcharias) which is relatively numerous in this area, and longnose spurdog (Squalus blainvillei) which is abundant. The southernmost area is located at the entrance to the Strait of Sicily, an essential migratory zone in the Mediterranean, considered a vulnerable area for small pelagic species.
Adriatic Sea Jabuka/Pomo Pit. The area, situated in the central Adriatic at a maximum depth of 200-260m, presents unique geomorphological and oceanographic features. In addition to playing an important role in the overall oceanographic dynamics of the entire Adriatic Sea, it is considered an Essential Fish Habitat, the only one in the central Adriatic, mostly for the reproduction and growth of important Adriatic demersal species, especially European hake (Merluccius merluccius). This area hosts the largest population of Norway lobster (Nephrops norvegicus) and is important especially for juveniles at depths below 200m. It is also a nursery zone for black-bellied angler (Lophius budegassa) and horned octopus (Eledone cirrhosa). Based on an available scientific data it is a high density area for giant devil ray (Mobula mobular) which is an endemic species. The Pit could function as a favorable environment for some key life history stages of the porbeagle shark (Lamna nasus), which is critically endangered. Regarding benthic species, several types of corals can be found (Scleractinia, Actiniaria). Although it covers less than 10 percent of the total surface of the Adriatic Sea, this area is one of the most important fishing grounds in the Adriatic for bottom trawling, which puts the fish resources of the entire Adriatic under pressure. Fish populations are threatened by overfishing and high fishing pressure on juveniles. Currently, the General Fisheries Commission for the Mediterranean is considering a proposal to close the Jakuba/Pomo Pit to bottom trawling.
Alicante Canyon. This is one of the largest submarine canyons in Spain’s eastern waters. Located in one of the areas with the widest continental shelf, it is part of one of the main rose shrimp (Parapenaeus longirostris) fishing areas, and thus is strongly impacted by shrimp bottom trawling. This area is an essential habitat and nursery area for the hake (Merluccius merluccius), together with the presence of other associated species (assemblages) in the canyon. Several cetacean species and the loggerhead turtle (Caretta caretta) are also present in the zone. The deepest part of the canyon, located on the eastern side, is a spawning ground for bluefin tuna (Thunnus thynnus). It is considered a sensitive habitat for several elasmobranches species (Etmopterus spinax, Galeus melastomus and Scyliorhinus canicula).
Balearic Seamounts. The area includes four different seamounts: Emile Baudot, Ses Olives, Ausías March and Bell Guyot. Essential habitats (bluefin tuna spawning ground) and sensitive habitats (bamboo coral gardens - Isidella elongata), maërl beds, coralligenous, gorgonian gardens (Muriceides lepida, Swiftia palida, Eunicella verrucosa, Villogorgia brevicoides, Viminella flagelum, Callogorgia verticilata) and black corals (Leiopathes glaberrima, Antipathes dichotoma) have been found. These organisms are particularly threatened by bottom trawling and long-line fishing. The presence of these species is often associated with the presence of commercial species (monkfish, hake, Norway lobster, lobster, octopus, red shrimp) which call for an adequate management. The area is also visited by pelagic species such as swordfish (Xiphias gladius), different dolphin species (Tursiops truncatus, Delphinus delphis), sperm whale (Physeter macrocephalus) and loggerhead turtle (Caretta caretta). Vulnerable Marine Ecosystems can also be found in the area.
The Alboran Sea Seamounts. These seamounts, located between the European and African continents in the Alboran Sea, are scattered throughout the area along with the remains of an old volcano rising 15m above sea level, making part of a mountain ridge (Alboran Island). Along the canyons of the Alboran Sea are deep water corals. Hake is one of the most important target species for the trawl fisheries in this area; it is fished at excessively high levels in all trawling areas from the Strait of Gibraltar to the Cape of Gata, including the deep bottom fishing grounds surrounding Alboran Island. Juvenile hakes are caught in more shallow waters of about 50-300m depth, whereas adults are fished at depths of around 800 m, together with the Nephrops norvegicus fishery.
Western Sardinia Canyons. The Catalano and Oristano submarine canyons are located off the east coast of Sardinia and together constitute the most important part of the canyon system surrounding the island. Submarine canyons usually are areas of interest for fisheries, in that they are highly productive zones due to their special hydrodynamics. In this case, fisheries for large pelagic species are present. In these zones one finds various cetacean species, such as Risso’s dolphin (Grampus griseus), sperm whale (Physeter macrocephalus), fin whale (Balaenoptera physalus), and striped dolphin (Stenella coeruleoalba), as well as large filter feeders such as basking shark (Cetorhinus maximus) and giant devil ray (Mobula mobular), which is relatively abundant in these areas. Moreover, at the edge of the slope there are lobster (Palinurus elephas) nurseries.
Southern Ligurian Seamounts. This area includes a series of seamounts (Cialdi, Giglio and Jadul) north of the Tyrrhenian Sea and on the edge of the Pelagos Sanctuary. It is a high primary production area which supports many different shark and ray species (Cetorhinus maximus, Carcharhinus brachyurus, Scyliorhinus canicula, Galeus melastomus, Etmopterus spinax, Raja clavata, Raja asterias). For most of these species, this area serves as a nursery. The six-gilled shark (Hexanchus griseus) and thresher shark (Alopias spp) are also found in this area. In the Cialdi seamount the first submerged micritic limestones were discovered with Acesta excavata associated with corals and polychaetes, including Vermiliopsis monodiscus and Protula sp.
Aegean Sea - The Thracian Sea. This is a disjunct area which covers two areas known as the Strymonian Gulf and the Samotraki Plateau. The Samotraki Plateau and the Strymonian Gulf are two demersal areas located in the north of the Aegean Sea, at a depth of around 180m, and are considered to be spawning grounds for hake. The area is an important fishing ground for bottom trawlers. These activities increase the mortality rates of juveniles of all species in the 180m isobath area of the Thracian Sea. As far as hake is concerned, the nursery and breeding grounds lie mainly in international waters in the Aegean and Thracian Seas.
Scientific Information to Describe Areas Meeting Scientific Criteria for Mediterranean EBSAs, Oceana (2014). Link
Fisheries conservation and vulnerable ecosystems in the Mediterranean open seas, including the deep seas, de Juan, S. and Lleonart, J. eds. UNEP-MAP-RAC/SPA (2010). Link