@article{fdi:010061690,
  title = {{N}ew insights in the spatial dynamics of sardinella stocks off {M}auritania ({N}orth-{W}est {A}frica) based on logbook data analysis},
  author = {{B}raham, {C}.{B}. and {F}r{\'e}on, {P}ierre and {L}aurec, {A}. and {D}emarcq, {H}erv{\'e} and {B}ez, {N}icolas},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ardinella spp. are the main species fished in {M}auritanian waters. {L}ogbook data (1991–2009) were used to standardise {CPUE}. {T}his clearly revealed that the abundance of sardinella peaked in the warm season ({J}uly–{S}eptember) which is the main, if not the only significant spawning season for round sardinella. {T}his study does not directly confirm or falsify the common belief that the adults migrate from the {S}enegalese {EEZ} up to north of the 21° {N} latitude, but it presents a variety of new hypotheses. {I}f a single transboundary stock exists, part of its individuals, or a sub-stock, is probably more sedentary and remains in the permanent upwelling area located in northern {M}auritania and southern {M}orocco. {B}etween years, changes in abundance index are dominated by a decrease from 1996 to 2006, depending on the months taken into account, and especially whether or not the warm (spawning) season is considered. {F}or a given month, the spatial distribution of sardinella shows limited differences between years. {I}n the southernmost latitudes of the {M}auritanian {EEZ} the seasonal pattern, which is dominated by high catch rates during the warm season, is much stronger after the year 2001, and then tended to increase year after year. {C}hanges in species distribution and abundance during the twenty-year study period are difficult to relate to environmental dynamics. {H}owever, an inversion of the upwelling trend was observed in 2001, matching a change in the seasonality of sardinella catches, although the causality between the two phenomena could not be established. {T}he increase in the abundance index of sardinella in the last five years, particularly during most of the core fishing season ({J}uly–{S}eptember) might be due to favourable oceanographic conditions (higher upwelling index) and/or changes in the fishing strategies or efficiency. {B}efore annual indices of abundance can be used in the future, it will be necessary to better understand possible changes in catchability during the warm/spawning season.},
  keywords = {{SARDINE} ; {ESTIMATION} {DE} {STOCK} ; {ABONDANCE} ; {DISTRIBUTION} {SPATIALE} ; {ZONE} {ECONOMIQUE} {EXCLUSIVE} ; {UPWELLING} ; {SAISON} {DE} {PONTE} ; {VARIATION} {SAISONNIERE} ; {VARIATION} {PLURIANNUELLE} ; {MAURITANIE}},
  booktitle = {},
  journal = {{F}isheries {R}esearch},
  volume = {154},
  numero = {},
  pages = {195--204},
  ISSN = {0165-7836},
  year = {2014},
  DOI = {10.1016/j.fishres.2014.02.020},
  URL = {https://www.documentation.ird.fr/hor/fdi:010061690},
}