@incollection{fdi:010085795,
  title = {{T}emporal trends and variability in the spatial distribution of {E}uropean tropical tuna purse-seine fishing in the {A}tlantic and {I}ndian {O}ceans},
  author = {{G}u{\'e}ry, {L}. and {K}aplan, {D}avid and {M}arsac, {F}rancis and {G}rande, {M}. and {A}bascal, {F}. and {B}aez, {J}.{C}. and {G}aertner, {D}aniel and {A}layon, {P}.{J}.{P}. and {V}idal, {T}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}t is useful to complement more sophisticated stock status estimations based on stock assessment models with simpler approaches based on analyses of raw catch-effort data to maximize the probability of detecting overexploitation and hyperstability as early as possible. {H}ere we develop a series of annual indices for the spatial distribution of catch over 1991-2019 by {E}uropean purse seine vessels of the three major tropical tuna species as a function of ocean and fishing mode (floating object or free swimming fish schools). {T}ime series of these indices are examined to identify temporal patterns with a focus on any long term trends that might be indicative of declining stock status or hyperstability. {S}patial indices are also calculated for important bycatch species over 2011-2019 from observer data for {F}rench vessels. {I}n general, results indicate a relative stability in the spatial distribution of catch over the last 30 years, though major perturbations, such as {S}omali piracy and major {E}l {N}iño events, are identifiable. {N}evertheless, recent decreasing trends in the presence of bigeye tuna and certain bycatch species merit further investigation.},
  keywords = {{ATLANTIQUE} ; {OCEAN} {INDIEN}},
  booktitle = {{I}nternational {C}ommission for the {C}onservation of {A}tlantic {T}unas = {C}ommission {I}nternationale pour la {C}onservation des {T}honid{\'e}s de l'{A}tlantique = {C}omision {I}nternacional para la {C}onservacion del {A}tun {A}tlantico},
  numero = {78 (2)},
  pages = {523--549},
  address = {{M}adrid},
  publisher = {{ICCAT}},
  series = {{C}ollective {V}olume of {S}cientific {P}apers},
  year = {2021},
  URL = {https://www.documentation.ird.fr/hor/fdi:010085795},
}