Identification of the variables that affect the spawning fraction of Argentine anchovy (Engraulis anchoita) Northern stock using generalized linear models
Keywords:Engraulis anchoita, reproduction, spawning frequency, spawning, pelagic fish, generalized linear models
The daily spawning females fraction (S) of Argentine anchovy (Engraulis anchoita) in relation to the year, length, proportion of females, temperature and salinity variables was studied using generalized linear models. Samples were collected during eleven research surveys carried out in the main spawning seasons and areas during 1993-2008. The aim of this work was to identify the factors that affect the spawning activity. No temporary differences were observed and an S 0.12 average value was estimated. The poor explanatory percentage of the models analyzed did not allow to clearly detect the variables that could affect S. Length and temperature were the only variables that related positively, which suggests that Argentine anchovy spawning activity might be related to the population females size composition that would be affected by the environment.
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Copyright (c) 2013 Ezequiel Leonarduzzi, Emiliano Di Marco, Marcelo Pájaro
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