WANG Jintao, CHEN Xinjun, Kevin W. Staples, CHEN Yong. A stock assessment for Illex argentinus in Southwest Atlantic using an environmentally dependent surplus production model[J]. Acta Oceanologica Sinica, 2018, 37(2): 94-101. doi: 10.1007/s13131-017-1131-y
Citation: WANG Jintao, CHEN Xinjun, Kevin W. Staples, CHEN Yong. A stock assessment for Illex argentinus in Southwest Atlantic using an environmentally dependent surplus production model[J]. Acta Oceanologica Sinica, 2018, 37(2): 94-101. doi: 10.1007/s13131-017-1131-y

A stock assessment for Illex argentinus in Southwest Atlantic using an environmentally dependent surplus production model

doi: 10.1007/s13131-017-1131-y
  • Received Date: 2016-06-25
  • Rev Recd Date: 2011-06-03
  • The southern Patagonian stock (SPS) of Argentinian shortfin squid, Illex argentinus, is an economically important squid fishery in the Southwest Atlantic. Environmental conditions in the region play an important role in regulating the population dynamics of the I. argentinus population. This study develops an environmentally dependent surplus production (EDSP) model to evaluate the stock abundance of I. argentines during the period of 2000 to 2010. The environmental factors (favorable spawning habitat areas with sea surface temperature of 16-18℃) were assumed to be closely associated with carrying capacity (K) in the EDSP model. Deviance Information Criterion (DIC) values suggest that the estimated EDSP model with environmental factors fits the data better than a Schaefer surplus model without environmental factors under uniform and normal scenarios. The EDSP model estimated a maximum sustainable yield (MSY) from 351 600 t to 685 100 t and a biomass from 1 322 400 t to 1 803 000 t. The fishing mortality coefficient of I. argentinus from 2000 to 2010 was smaller than the values of F0.1 and FMSY. Furthermore, the time series biomass plot of I. argentinus from 2000 to 2010 shows that the biomass of I. argentinus and this fishery were in a good state and not presently experiencing overfishing. This study suggests that the environmental conditions of the habitat should be considered within squid stock assessment and management.
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