Estimación y variabilidad temporal de talla de madurez gonadal de la caballa (Scomber japonicus peruanus) en el litoral peruano

Revista Peruana de Biologia

Torrejón-Magallanes, Josymar¹  Sánchez, Javier¹  Ñiquen, Miguel¹  Mori, Julio¹  Bouchon, Marilú¹ 

[1] Instituto del Mar del Perú, Perú

关键词: Chub mackerel;    size-at-gonad maturity;    temporary changes;    generalized linear mixed models;    random effects.;   

DOI  :  10.15381/rpb.v24i4.13741

学科分类：生物科学（综合）

来源: Universidad Nacional Mayor de San Marcos * Facultad de Ciencias Biologicas

【 摘 要 】

The values of size-at-gonad maturity (L50) of chub mackerel (Scomber japonicus peruanus) were estimated for the years 1994 - 2017 in the Peruvian littoral. The analysis was performed for the period November - March where the highest reproductive activity occurs. The proportion of mature females was ftted using a logistic binary model, through generalized linear mixed models (MLGM), which assumes random effects associated with the periods. The GLMM, with fixed effects estimated a L50 of 24.8 cm of fork length (FL) (24.69 cm - 24.9 cm), while with changes between periods, with random effects, L50 ranged between 20.4 cm and 27.0 cm FL. It was observed that an increase in temperature caused the decrease of the L50 in the years 1997 - 1999 and 2015 - 2016, which coincides with El Niño events. A positive correlation was found between the L50 and spawning biomass, so changes in L50 may be a density-dependent effect. There was no trend in the L50 series, so there would be no effect of the fishing mortality (F) on the L50. However, we think that the decrease in the L50 in relation to a low population density and mainly an increase in F should be given as a long-term effect and not in isolated events as our results showed.

【 授权许可】

CC BY-NC