Data/hora: 02/06/2024 11:06:55

Provedor de dados: | 5
País: | France
Título: | Contribution des frayères côtières au recrutement du stock de seiche Sepia officinalis de Manche : lien entre le succès de la phase pré-recrutée et l'abondance de la ressource
Autores: | Gras, Michael.
Data: | 2013-06-17
Ano: | 2013
Palavras-chave: | Sepia officinalis; Manche; Cycle de vie; Pêcheries; Modèle d'évaluation de stock; Recrutement.; Sepia officinalis; English Channel; Life cycle; Fisheries; Stock assessment model; Recruitment.
Resumo: | The English Channel cuttlefish Sepia officinalis is the most important cephalopod stock in the N-E Atlantic but is only managed by local measures, mainly due to a lack of suitable tools. The objective of this work is therefore to improve the knowledge of its population dynamic, particularly the parameters inuencing the resource abundance. After a summary of the state of the art, in a first step, the exploration of the stock structure during the reproduction period revealed that, in a warming and high fishing pressure context, the life history traits of cuttlefish have changed and a percentage of one year old cuttlefish are mature. In a second step, the inuence of the fuel price on the spatial allocation of the French trawling effort was highlighted and this metier is the most suitable to derive cuttlefish abundance indices. In a third step, a two stage biomass model, a suitable model to assess exploited marine populations with poor age data, was developed and enabled the development of two indicators of the fishing impact on the exploited cohort: the stock-recruitment relationship and the exploitation rate. In a fourth and final step, the contribution of 3 spawning areas to the recruitment was explored using 3 different techniques. Results indicate that the central stock is a mix between different spawning areas and seems to be inuenced by different environmental and anthropic parameters. Finally, results are discussed in the context of each life cycle phase (reproduction, pre-recruit stage, recruitment and exploitation) and perspectives are presented.
Tipo: | Text
Idioma: | Francês
Identificador: | http://archimer.ifremer.fr/doc/00160/27135/25334.pdf
Editor: | Université de Caen Basse-Normandie
Relação: | http://archimer.ifremer.fr/doc/00160/27135/
Formato: | application/pdf
Fonte: | 2013 Université de Caen Basse-Normandie