SEANEO

Port-Saint-Louis-du-Rhône, France
Port-Saint-Louis-du-Rhône, France

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Tessier A.,SEANEO | Tessier A.,University of Perpignan | Tessier A.,French National Institute for Agricultural Research | Francour P.,CNRS Ecology of Marine Ecosystems and Responses to Stress Laboratory | And 6 more authors.
Hydrobiologia | Year: 2015

Artificial reefs have been deployed in France since 1968 with the principal objective of enhancing success and continuity of artisanal fishing. Over 50 % of the volume of reef material has been deployed since 2000. Because of significant expansion of reef construction and availability of new research results concerning their performance since the late 1990s, we examined status and trends of French artificial reefs. Since the review of Barnabé et al. (Artificial reefs in European seas, 2000), 35 reports have been published and are analyzed here. Fish assemblages on artificial reefs have been the focus of ecological research, with emphasis on species richness and abundance. Fish production has been associated with the age of artificial reefs and the reef’s structural complexity. The perception of stakeholders toward artificial reefs is a notable area of investigation. Economic studies are absent. Other developments in French artificial reefs over the last 10–15 years include the discontinued use of waste materials in reef construction, more directed design of reef structure, and the inclusion of additional objectives concerning biodiversity and recreation. Recommendations here include development of long-term ecological studies of artificial reefs and the evaluation of fishery production, including issues such as trophic dynamics, ecological connectivity of habitats, and socio-economic studies. © 2015, Springer International Publishing Switzerland.


Tessier A.,SEANEO | Tessier A.,CNRS Training and Research Center on Mediterranean Environments | Tessier A.,French National Institute for Agricultural Research | Dalias N.,SEANEO | Lenfant P.,CNRS Training and Research Center on Mediterranean Environments
Journal of Applied Ichthyology | Year: 2015

Artificial reefs (ARs) have been deployed in France primarily to sustain artisanal fishery; however, based on their perceptions of these coastal management tools they can also be frequented by other sea users. In this work, the perceptions of AR professional and recreational users (direct users only) were studied by focusing on three AR sites located along the Gulf of Lion coastline (northwestern Mediterranean Sea, France) to determine whether they were becoming multi-use sites or were negatively perceived. Between 2011 and 2012, semi-directed interviews with artisanal fishermen, recreational fishermen, recreational spear fishermen and SCUBA divers were conducted to characterize their profiles, levels of knowledge, and expectations regarding ARs and how well these expectations were satisfied. The results showed although ARs were designed for use by artisanal fishermen that they were also frequented by others, mainly the local populations. The enhancement of fish at AR locations to maintain target species (e.g. Sparus aurata, Mullus sp.) for fishing activities was a common expectation. There were also expectations specific to AR usage, which varied among the different sites and users. Several factors influenced user satisfaction, such as AR design and communications by local authorities regarding this coastal tool. The results of this study indicate that AR users have either neutral or positive perceptions regarding ARs. In addition to their ecological objectives, ARs have socio-economic potential; therefore effective strategies for their management should be explored. © 2015 Blackwell Verlag GmbH.


Koeck B.,CNRS Training and Research Center on Mediterranean Environments | Koeck B.,French National Center for Scientific Research | Pastor J.,CNRS Training and Research Center on Mediterranean Environments | Saragoni G.,CNRS Training and Research Center on Mediterranean Environments | And 3 more authors.
Marine Environmental Research | Year: 2014

Temporal movement patterns and spawning behaviour of the dusky grouper Epinephelus marginatus were investigated using depth and temperature sensors combined to acoustic telemetry. Results showed that these fish are year-round resident, remaining inside the fully protected area of the marine reserve of Cerbère-Banyuls (65 ha) and display a diurnal activity pattern. Records from depth sensors revealed that groupers range inside small, distinct, and individual territories. Individual variations in habitat depth are only visible on a seasonal scale, i.e., between the spawning season and the rest of the year. In fact, during summer months when the seawater temperature exceeded 20 °C, tagged groupers made vertical spawning migrations of 4-8 m in amplitude. These vertical migrations are characteristic of the reproductive behaviour of dusky groupers, during which they release their gametes. The results are notable for the implementation of management rules in marine protected areas, such as reduced navigation speed, boating or attendance during spawning season. © 2013 Elsevier Ltd.


PubMed | CNRS Training and Research Center on Mediterranean Environments, SEANEO and Reserve Naturelle Marine de Cerbere Banyuls
Type: | Journal: Marine environmental research | Year: 2014

Temporal movement patterns and spawning behaviour of the dusky grouper Epinephelus marginatus were investigated using depth and temperature sensors combined to acoustic telemetry. Results showed that these fish are year-round resident, remaining inside the fully protected area of the marine reserve of Cerbre-Banyuls (65 ha) and display a diurnal activity pattern. Records from depth sensors revealed that groupers range inside small, distinct, and individual territories. Individual variations in habitat depth are only visible on a seasonal scale, i.e., between the spawning season and the rest of the year. In fact, during summer months when the seawater temperature exceeded 20 C, tagged groupers made vertical spawning migrations of 4-8 m in amplitude. These vertical migrations are characteristic of the reproductive behaviour of dusky groupers, during which they release their gametes. The results are notable for the implementation of management rules in marine protected areas, such as reduced navigation speed, boating or attendance during spawning season.

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