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Publications (55)
The European eel, Anguilla anguilla, is an emblematic facultative catadromous species that spawns in the Sargasso Sea and grow in continental waters of Europe and North Africa. In most of its growing habitats its population has dropped since 1980. Although Mediterranean lagoons represent particularly important habitats for eel, knowledge of eel eco...
Anguilla anguilla, A. japonica and A. rostrata are the most fished and consumed eel species. However, these species are Critically Endangered, Endangered and Endangered, respectively. A combination of factors is thought to be responsible for their decline including fisheries, climate change, habitat destruction, barriers to migration, pollution and...
Mediterranean lagoons are particularly important ecosystems for the European eel (Anguilla anguilla) population. Yet, the knowledge of eel ecology in lagoons is not as developed as it is in rivers and estuaries. Particularly, fisheries independent data describing silver eel escapement from the lagoons at a fine temporal scale are scarce. This lack...
Nineteen female silver European eels (Anguilla anguilla L.) were tagged with satellite tags and released in the Gulf of Lion in the Mediterranean during the migration seasons 2013 and 2015. Sixteen tags transmitted data: five in the Atlantic Ocean, and eleven in the Mediterranean. Of those, 50% of migrating eels were consumed by marine mammals in e...
European eel, Anguilla anguilla, is an emblematic diadromous species which population has dropped since 1980. Although Mediterranean lagoons represent productive brackish ecosystems, particularly important for eel, knowledge of eel ecology in Mediterranean lagoons is not as developed as it is in rivers. Particularly, data on glass eels’ recruitment...
Anguillid eels are found globally in fresh, transitional and saline waters and have
played an important role in human life for centuries. The population status of several
species is now of significant concern. The threats to populations include direct
exploitation at different life stages, blockages to migratory routes by dams and other
structures,...
Transitional ecosystems and, particularly, Mediterranean lagoons represent important habitats for the European eel (Anguilla anguilla) population. In these habitats many anthropogenic pressures can disturb eel movements and, in turn, negatively affect the population. Despite the importance of movements during the non-migrant growing stage in eels,...
The European eel Anguilla anguilla is listed as critically endangered by the IUCN. Among many threats, the introduced parasitic nematode Anguillicola crassus is suspected to alter the eels' swim bladder and jeopardize their reproductive oceanic migration. To date, gaining knowledge about the distribution and prevalence of A. crassus requires indivi...
Despite the increasing use of acoustic cameras in fish ecology and fisheries studies, the quantification of biases associated with this method have received little attention. In this note, we used data collected from an ARIS acoustic camera, positioned in a channel linking a lagoon to the sea, to quantify differences in European eel (Anguilla angui...
The European eel is critically endangered. Although the quality of silver eels is essential for their reproduction, little is known about the effects of multiple contaminants on the spawning migration and the European eel management plan does not take this into account. To address this knowledge gap, we sampled 482 silver eels from 12 catchments ac...
Seven South Pacific anguillid eel species live from New Guinea to French Polynesia, but their spawning areas and life histories are mostly unknown despite previous sampling surveys. A July–October 2016 research cruise was conducted to study the spawning areas and times, and larval distributions of South Pacific anguillid eels, which included a shor...
Scientific Reports 6 : Article number: 21817; 10.1038/srep21817 published online: 24 February 2016 ; updated: 20 May 2016 . In Figure 2 of this Article, the upper left graph is a duplication of the upper right graph.
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, we equipped eight female silver eels from the south of France with po...
The European anchovy, Engraulis encrasicolus L. 1758, is one of the most sought-after target species in the northwestern Mediterranean Sea. However, this stock currently
consists of small individuals, and landings are reported to have decreased considerably. The main purpose of this study was
to assess, for the first time, the interrelationships be...
The reproductive and general health of exploited fish stocks is an essential element of sustainable and profitable fisheries. The main purpose of this study was to assess the relationships between reproduction and two important parameters of fish health (parasitism and energy reserves) in female specimens of red mullet, Mullus barbatus, from the we...
The present invention concerns methods and kits for detecting, identifying and/or quantifying a pathogen in a tissue sample of an individual, and/or for diagnosing an infection by a pathogen in a tissue sample of an individual, comprising the analysis of high resolution melt curves obtained from cDNA produced from RNA extracted from said tissue sam...
Helminth parasites were studied in 149 silver eels from five sites in northern Europe. In total, 88% were infected by 12 species including Monogena, Cestoda, Nematoda, and Acanthocephala. Anguillicoloides crassus was most common (56%), then Acanthocephalus clavula (30%) and Pseudodactylogyrus spp. (17%). The body condition (BC) was negatively influ...
It is well known that parameters relating to physical condition and reproduction of fish provide essential data for estimating
the productivity of exploited populations, as is the case with the European hake (Merluccius merluccius) in the northwestern Mediterranean Sea. Although parasitism might affect these parameters, research in this area is ver...
The degradation in the quality of silver eel and their health could have been a major factor in the collapse of the European eel (Anguilla anguilla) population. However, the health status of the spawners has been poorly studied until now. This study evaluated the quality of migrant male silver eels from four Mediterranean habitats in France present...
Lepidapedon sereti n. sp. is described from the macrourid Coelorinchus sereti from the deep water off Vanuatu. It is placed in the Elongatum group and Elongatum subgroup. It differs from the other species described in this subgroup by the distinctly dorsally subterminal excretory pore. It also differs from other species in combinations of size, exc...
Environmental characteristics in water and sediments of two contrasted coastal Mediterranean lagoons, Bages-Sigean and Canet-St Nazaire, were measured over a three season survey. The urban pollution (treatment plant discharges) is very important in Canet-St Nazaire lagoon reflecting untreated sewages, while in Bages-Sigean, the northern part appear...
Because parasitism is among the reasons invoked to explain the collapse of Anguilla anguilla, we evaluated the parasitic constraint on body condition (BC) of migrant silver eels as a proxy of fitness with inter-site comparisons. Metazoan parasites were studied in 149 silver eels from five sites (northern Europe). In total, 89% were infected by 13 s...
Economic issues regarding fishing within the Mauritanian Exclusive Economic Zone are of heightened importance. Fish exports are one of the main economic resources of the country. However, European sanitary quality is not always reached for exported fishes. In previous years, an European ban on exportation had devastating effects on the economy of t...
Although fish health may influence key population-level processes, particularly those dealing with natural mortality, reproduction, and growth, which, in turn, affect stock productivity, little emphasis has been placed on the links between fish health and the management of marine fisheries. This article addresses this gap and illustrates how knowle...
Eel virus European X (EVEX) was first isolated from diseased European eel Anguilla anguilla in Japan at the end of seventies. The virus was tentatively classified into the Rhabdoviridae family on the basis of morphology and serological cross reactivity. This family of viruses is organized into six genera and currently comprises approximately 200 me...
The present paper deals with Proctophantastes nettastomatis (Digenea: Zoogonidae; Lepidophyllinae) found in the intestine of three species of deep-sea fish, Dicrolene longimana (Ophidiidae, Ophidiiformes), Bathyuroconger sp. (Congridae, Anguilliformes), and Venefica tentaculata (Nettastomatidae, Anguilliformes). The fish were collected near the isl...
The influence of sea-cage salmon farms in increasing the parasite loads of wild salmonids has received considerable attention due to the potential negative consequences for both natural populations and cultivated stock. However, studies dealing with the parasitological loads of reared fish of other species and their relation with farm-associated wi...
The sea bass, Dicentrarchus labrax, is one of the most extensively farmed marine fishes in the Mediterranean. Under the high-density condition common in aquaculture, the monogenean gill parasite Diplectanum aequans can cause significant economic losses. This study used real-time quantitative PCR to investigate the dynamic expression of immune respo...
Proctophantastes brayi n. sp. (Digenea: Zoogonidae; Lepidophyllinae) has been found in the intestine of two species of deep-sea fish Polymixia (silver eye fish) near the island of Erromango in Vanuatu at a depth ranging from 720 to 830 m. Specimen whole mounts, histological and scanning electron microscopy preparations showed that P. brayi differs...
Gobius bucchichii, in a protected area lived longer than those outside the reserve. Our findings emphasize the cryptic role played by marine protected areas on ecosystems.
Most studies which aim at detecting effects of parasites on fish show that intermediate stages of parasites affect their host while adult parasites are usually less virulent in the final host. We studied the effect of the acanthocephalan Acanthocephaloides propinquus on one of its final hosts, the fish Gobius bucchichii. This study showed that the...
Recruiting coral reef fish larvae from 38 species and 19 families from New Caledonia were examined for parasites. We found 13 parasite species (Platyhelminthes: Monogenea, Cestoda and Trematoda) but no acanthocephalan, crustacean or nematode parasites. Over 23% of individual fish were infected. Didymozoid metacercariae were the most abundant parasi...
Ditrachybothridium piliformis is a new species from the spiral intestine of a cat shark, Galeus sp., from the southern Pacific Ocean. This is only the second species assigned to Ditrachybothridium. It differs from the type species D. macrocephalum in lacking spines on the scolex, a character originally used to diagnose the genus. The diagnoses of t...
Ditrachybothridium piliformis is a new species from the spiral intestine of a cat shark, Galeus sp., from the southern Pacific Ocean. This is only the second species assigned to Ditrachybothridium. It differs from the type species D. macrocephalum in lacking spines on the scolex, a character originally used to diagnose the genus. The diagnoses of t...
Ecological factors may influence the number of parasites encountered and, thus, parasite species richness. These factors include diet, gregarity, conspecific and total host density, habitat, body size, vagility, and migration. One means of examining the influence of these factors on parasite species richness is through a comparative analysis of the...
Recolonisation of protected areas by new host species, and their parasites, or the translocation of individuals (accidentally or intentionally) to new locations may induce new host-parasite associations. Parasites are usually found to be less well-adapted and more virulent to newly colonized host species. Such new host-parasite associations may rep...
Acanthocephalans are polygamous parasites of vertebrates and some species are known to aggregate in sexual congress to mate. Such a reproductive behaviour could lead to male-male competition for access to females and could have consequences for sexual selection. We dissected 87 gobiid fish, Gobius bucchichii, harbouring 891 acanthocephalans, Acanth...
The effects of parasites on coral reef fishes are largely unexplored and unknown. In other fish-parasite systems, parasites may have far reaching effects upon their hosts, leaving few aspects of their host's biology unaffected. In French Polynesia, coral reef fishes are relatively well studied, but the effects of parasites upon the coral reef fish...
Three species of fish of great economic interest, Dicentrarchus labrax (Linnaeus) (N = 15),Anguilla anguilla (Linnaeus) (A/ = 20), and Mugil ce-phalus Linnaeus (N = 20), were collected during April and June 1997 from Biguglia Pond in Corsica, France, and examined for metazoan parasites. A total of 25 ectoparasite and endoparasite species were recov...
We collected 396 Gobius bucchichii, Steindachner, 1870 (Teleostei, Gobiidae) in and around the marine reserve of Cerbère-Banyuls, in the southeast of France, between March and July 1994. Five species of adult parasites were found: one acanthocephalan, Acanthocephaloides propinquus Dujardin, 1845 (Acanthocephala, Arhythmacanthidae); one nematode, Cu...
La campagne MUSORSTOM 8, réalisée à bord du N.O. "Alis", s'est déroulée dans les eaux de Vanuatu du 19 septembre au 14 octobre 1994. Cent quatre-vingt-six opération de dragages et de chalutages ont eu lieu dans la zone bathyale supérieure, sur les pentes des îles et sur le sommet du guyot Bougainville. De grandes superficies chalutables ont été déc...
A technique for the artificial infection of the snail Helix aspersa by its parasite the nematode Nemhelix bakeri is described. The snail is relaxed by injection of an anesthetic, and 1 gravid female worm is introduced into the genitalia through the genital pore. Half of the injected snails were successfully infected. Following the course of infecti...
The resorption of unemitted gametes during the post-spawning period of the male and female reproductive cycles in Lithognathus mormyrus was studied by histochemical, histological and cytological methods. The resorption of residual spermatozoa involved the phagocytotic activity of Sertoli cells bounding the seminiferous cysts of spermatozoa, and tho...
The population dynamics of Labratrema minimus (Stossich, 1887) metacercariae (Trematoda, Bucephalidae) were studied in its second intermediate fish host Atherina boyeri from Salses-Leucate lagoon (Northwest Mediterranean Sea, South of France), during the cercarial shedding period. The infection parameters (prevalence and mean abundance of infection...
A histo-cytological study was carried out on the effects of Labratrema minimus (Stossich, 1887) metacercariae (Trematoda, Bucephalidae) in the liver of the second intermediate hosts, grey mullet Liza ramada and silverside Atherina boyeri. The following features were seen at the interface between the fish and the parasite. (1) Formation of the initi...
Projects
Projects (4)
European eel, Anguilla anguilla, is an emblematic amphihaline fish species distributed from Norway to northern African coast. It has been fished for centuries, however, a severe depletion of its stock has been observed since 1980 (in 2017, it was from two to 10% compared to the 1960-1979 reference period). In response to this decrease, the European Union adopted in 2007 measures to bring about the recovery of the eel stock (Regulation EC No 1100/2007) and EU countries had to draw up and implement national eel management plans at river-basin level. The long term key objective of these plans is to “reduce anthropogenic mortalities so as to permit with high probability the escapement to the sea of at least 40% of the silver eel biomass relative to the best estimate of escapement that would have existed if no anthropogenic influences had impacted the stock”.
Mediterranean lagoons are very productive brackish ecosystems which appear to be of particular importance for European eels’ population: the remarkably fast growth of the eels living in lagoons allows the production of genitors in a short generation time. However, knowledge of European eel ecology in Mediterranean lagoons is not as developed as it is in freshwater ecosystems. In particular, quantitative data on glass eels’ recruitment to the lagoons and silver eels’ escapement to the Mediterranean Sea are very scares.
In this context the FLUX project aims at acquiring new quantitative data on glass eels’ recruitment and silver eels’ escapement to and from a pilot lagoon, the Bages-Sigean complex (South Western French Mediterranean coast). Recruitment and escapement monitoring will be performed daily during a whole year to identify the main migration periods. Daily monitoring of recruitment and escapement will then be focused on these main migration periods during the two following years. Silver eels’ escapement will be estimated using an adaptive resolution imaging sonar (ARIS) when glass eels’ recruitment will be monitored using both passive and active traps. In addition, environmental factors will be measured continuously in the sampling area (i.e. turbidity, discharge, salinity, temperature…) or estimated based on the measurement made at the closest meteorological stations (rainfalls, wind strength and direction, atmospheric pressure, cloud cover…). The FLUX project should provide valuable data to improve prediction of glass eels’ recruitment and silver eels’ escapement abundances based on these environmental factors. These results should increase our understanding of European eel ecology in Mediterranean lagoons and, ultimately, to develop management plan specifically adapted to these unique ecosystems.
Date : October 2018 – November 2021
Financial support : Agence de l’Eau Rhône Méditerranée et Corse, Région Occitanie, Ministère de l’Agriculture et de l’Alimentation, Fonds National d’Aménagement et de Développement du Territoire, Université de Perpignan Via Domitia, CNRS.
