Fish catches from French Mediterranean lagoons INPOLAG surveys (2019-2021)

Date 2022
Temporal extent 2019-09 -2021-06
Author(s) Motte Marie1, Certain Gregoire1, Vaz SandrineORCID1, Amilhat Elsa2, Bellamy Elise1, Bourdeix Jean-Herve1, Cheret Isabelle1, Cimiterra Nicolas1, Contournet Pascal3, Darnaude Audrey4, Derolez ValerieORCID1, Faliex Elisabeth2, Gianaroli Camille1, Iotti Marie1, Jadaud Angelique1, Orozco Lucie1, Metral LuisaORCID1, Nicolas Delphine3, Simon Gael2, Schull Quentin1, Villeneuve Remi1, Violette Herve1, Ouisse VincentORCID1
Affiliation(s) 1 : MARBEC, Univ. Montpellier, IRD, Ifremer, CNRS, Sète, France
2 : CEFREM, Univ. Perpignan, CNRS, Perpignan, France
3 : Tour du Valat, Arles, France
4 : MARBEC, Univ. Montpellier, IRD, Ifremer, CNRS, Montpellier, France
DOI 10.17882/91950
Publisher SEANOE
Keyword(s) WFD, Fish indicator, Transitional water bodies, Lagoons, Mediterranean, Beach seine, Fish inventory, Juvenile fish

In order to meet the expectations of the Water Framework Directive (WFD) concerning the assessment of the ecological status of transitional water bodies, of which lagoons are part, UMR MARBEC (Ifremer, IRD, UM,CNRS) has coordinated the INPOLAG project (2019-2023) in collaboration with CEFREM (Centre de Formation et de Recherche sur les Environnements Méditerranéens-UMR 5110 CNRS-UPVD) and Tour du Valat. This project aimed to develop one of the indicators missing from the WFD requirements: the "Fish in Mediterranean lagoons" indicator adapted to the French context. To this aim, three field surveys were carried out in autumn 2019 and 2020 and in spring 2021 (Motte et al. 2020). The present dataset gathers all the biological and environmental observations obtained in the course of these three surveys.

Licence CC-BY-NC-ND
Utilisation We do our best to ensure that the data is complete, accurate and useful. However, because the processing required to generate the data is complex, we cannot be liable for omissions or inaccuracies. The data and any related materials contained therein are provided “as is”, without warranty of any kind, either express or implied, including by not limited to, fitness for a particular purpose, non-interference, system integration, or non-infringement. The entire risk of use of the data shall be with the user.
Acknowledgements This dataset was produced within the frame of the INPOLAG project, funded by Ifremer and the Office Française de la Biodiversité. The authors are grateful to the CRPMEM-Occitanie, fishermen and all the people that got involved in the collection of these data.
Sensor metadata

On the French Mediterranean coast, more than thirty lagoons are classified as transitional water masses under the WFD. The lagoons selected for the INPOLAG project were chosen to cover the different levels of two gradients: connectivity to the sea and eutrophication. These two gradients can take values ​​from 1 to 3, with:

  • For connectivity to the sea: 1 (Weakly connected) to 3 (Strongly connected)
  • For eutrophication: 1 (Weakly eutrophicated) to 3 (Highly eutrophicated

Furthermore, the sediment types and the types of dominant vegetation cover within each Mediterranean lagoon was also used to stratified the survey sampling (Menu et al., 2020). The sampling strata corresponded to the crossing between:

- sediment typology: Sand (S:> 75% sand), Muddy sand (SV: 50-75% sand), Sandy mud (VS: 25-50% sand), Mud (V: < 25% sand)

- dominant vegetation cover: Algae (A), Phanerogams (P) or Nude (Nu).

For each stratum, ideally a minimum of 3 replicates were sampled.

The fishing gear used was a 10m wide and 2m high fine meshed beach seine (4mm mesh side). This fishing gear mainly targets benthic-demersal fish species for which the swimming abilities are relatively low (slow-moving species or individuals at the juvenile stage). Decapods (shrimps, crabs) may also be very abundant and were also recorded as they can provide information on the ecological quality of water bodies.

The stations were reached by boat to ease access and transportation of equipment, catch and operators. The beach seine was deployed by two operators over depths ranging from 0.5 to 1 m deep and over a distance of 25 m. At station, various environmental and physico-chemical parameters were measured. In order to validate the sedimentary facies, a sediment sample was also collected for particle size analysis in the laboratory. The dominant vegetation cover on each station was determined visually following the deployment of the beach seine

For each seine haul, the whole catch was sorted and weighted at species level based on various relevant identification keys or were taken back to the laboratory for further identification if needed. For a representative sub-sample of each species, individuals were weighted and measured (total length for fish and length or width of the cephalothorax for decapods). When sex could be observed externally, this information was also noted.

The present dataset is composed of 6 tables.

1. The "lagoon table" recalling lagoon names and codes as well as their connectivity and eutrophic levels.

2. The "operation table" gives information about each operation (survey, date, location, strata, etc).

3. The "catch table" gives information on species catch raised as total number or total weight (kg) in the haul.

4. The "individual_observation table" gives information on measured individual length, weight or sex.

5. The "parameters table" gives information on observed % substrate cover (algae, phanerogams or sediment), salinity, temperature, depth, oxygen saturation, current speed, wind direction, cloudiness, sea state.

6. The "sediment table" gives information on particle size distribution in 5 fractions (< 2µm; 2µm< x <20µm; 20µm< x <50µm; 50µm< x <200µm; 200µm< x <2mm) and organic matter content. This last table does not have records for all the stations.

File Size Format Processing Access
97901.xlsx 1 MB XLS, XLSX Processed data Open access
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How to cite 

Motte Marie, Certain Gregoire, Vaz Sandrine, Amilhat Elsa, Bellamy Elise, Bourdeix Jean-Herve, Cheret Isabelle, Cimiterra Nicolas, Contournet Pascal, Darnaude Audrey, Derolez Valerie, Faliex Elisabeth, Gianaroli Camille, Iotti Marie, Jadaud Angelique, Orozco Lucie, Metral Luisa, Nicolas Delphine, Simon Gael, Schull Quentin, Villeneuve Remi, Violette Herve, Ouisse Vincent (2022). Fish catches from French Mediterranean lagoons INPOLAG surveys (2019-2021). SEANOE.