Dynamics of the Shrimp Palaemon serratus Populations in Normandy, France: From the Knowledge of its Biology to its Sustainable Fishery - Archive ouverte HAL Accéder directement au contenu
Communication Dans Un Congrès Année : 2023

Dynamics of the Shrimp Palaemon serratus Populations in Normandy, France: From the Knowledge of its Biology to its Sustainable Fishery

Résumé

The shrimp Palaemon serratus (Pennant, 1777) is a common species in Normandy rocky shores. Professional and recreative fishermen have developed several techniques to harvest this target species: landing net, trap and trawl. For two decades, the populations show high temporal fluctuations and tend to decrease. During the GeDuBouq project (2020-2023), four sites has been chosen to acquire data on the biology and dynamics of the species in Normandy. A twoyear survey of the population at two sites (Grandcamp-Maisy and Blainville-sur-Mer) shows that the species reproduces during winter and spring with the presence of larvae at the end of spring; then the juveniles recruit in summer and rapidly grow to reach a total length of 5 cm (the minimum size authorized to fish) at the beginning of the autumn. The longevity is estimated to 2-5 years. At Blainville-sur-Mer, shrimps can be parasitised by bopyrid isopod, Bopyrus squillarum with a mean prevalence of 6% throughout the survey. Using isotopes and stomach contents at four sites (the two sites mentioned above plus Chausey and Antifer), an omnivorous regime has been identified with prey differences at Grandcamp-Maisy under estuarine conditions. Few professional vessels fish P. serratus in Normandy with a quantity of disembarkation reaching ~ 22 tons in 2020. Conversely, the quantity of harvesting by recreative fishermen remains unknowledge in spite of numerous fishermen in some Normandy spots. The results obtain in this study can help the French maritime administration to adapt the season of shrimp fish outside the period of ovigerous female presence.
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Dates et versions

hal-04291090 , version 1 (21-11-2023)

Identifiants

  • HAL Id : hal-04291090 , version 1

Citer

K Costil, C Guégan, C Caplat, A Serpentini, C Roger, et al.. Dynamics of the Shrimp Palaemon serratus Populations in Normandy, France: From the Knowledge of its Biology to its Sustainable Fishery. The 19th French-Japanese Oceanography Symposium, Oct 2023, Caen, France. ⟨hal-04291090⟩
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