@article{fdi:010049395,
  title = {{E}stimates of historic changes in total mortality and selectivity for {E}astern {A}tlantic skipjack ({K}atsuwonus pelamis) from length composition data},
  author = {{G}aertner, {D}aniel},
  editor = {},
  language = {{ENG}},
  abstract = {{C}atch-at-size data of the eastern {A}tlantic skipjack were used to estimate changes in total mortality from 1969 to 2007. {W}e used a transitional model of mean length that generalized the {B}everton-{H}olt mortality estimator to allow change in mortality rate under nonequilibrium conditions. {T}hen, from homogeneous periods of time, length-converted catch curves were used to access qualitative changes in selectivity patterns for two surface fisheries (the baitboat fishery operating from {D}akar, {S}enegal, and the {E}uropean and associated purse seine fisheries). {T}o explore the impact of catch on the mortality rate, a {B}ayesian change-point analysis was conducted on the catch time series to detect concomitant variation between mortality rates and catch. {F}inally, potential causes of these changes are discussed in relation to the implementation of new fishing technology, such fish aggregating devices ({FAD}). {T}he general pattern depicted by total mortality is in agreement with previous knowledge on this fishery: a state of complete or practically complete exploitation during the nineties followed by the decrease in nominal purse seine fishing effort in the last decade, combined with the effect of a seasonal moratorium on {FAD} fishing operations. {T}here was no evidence of a change in selectivity between the two contrasted periods of time considered: 1969-1979 and 1986-1999; the second period being characterized by the introduction of new technology onboard vessels. {I}n contrast, the covariation over time between total catch and mortality rate three years later highlights the effect of the fishing pressure on the stock of eastern {A}tlantic skipjack.},
  keywords = {{S}kipjack tuna ; {M}ortality rate ; {FAD} ; {F}ishing strategies ; {B}ayesian ; change-point analysis},
  booktitle = {},
  journal = {{A}quatic {L}iving {R}esources},
  volume = {23},
  numero = {1},
  pages = {3--11},
  ISSN = {0990-7440},
  year = {2010},
  DOI = {10.1051/alr/2009034},
  URL = {https://www.documentation.ird.fr/hor/fdi:010049395},
}