Identificación de las zonas de desove del pez Stromateus stellatus en zona centro-sur de Chile.
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Date
2025
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Publisher
Universidad de Concepción
Abstract
Se determinaron las principales zonas de desove del pez marino Stromateus stellatus Cuvier, 1829 (Scombriformes, Stromateidae) en la zona centro-sur de Chile (33°00’S-41°00’S). Para ello, se describen los huevos de esta especie, y se caracterizan 3 grupos de distintos estados de desarrollo embrionario. Además se analizó la distribución y abundancia en relación con la temperatura y la salinidad superficial. Para ello, se analizaron 377 estaciones con muestras de ictioplancton recolectadas durante el crucero del Fondo de investigación pesquera FIP 2008-09 que abarcó desde la región de Valparaíso hasta la región de Los Lagos, entre los meses de Septiembre a Octubre del año 2008, complementadas con perfiles hidrográficos con CTD que permitieron caracterizar las condiciones ambientales de la zona de estudio. Para evaluar la influencia de estas variables en la distribución y abundancia de huevos se utilizaron Modelos Aditivos Generalizados (GAMs). Los resultados revelaron que las mayores concentraciones de huevos se registraron en la zona sur del área de estudio, específicamente entre 39°S y 40°S, y en áreas con temperaturas superficiales entre 11,5°C y 13,5°C, y salinidades entre 30 y 34 PSU. En la zona sur, se observó un desplazamiento de los huevos hacia zonas costeras a medida que avanzan en su desarrollo, junto con un leve transporte hacia el norte. Se concluyó que la salinidad es un factor determinante en la distribución de los huevos y que las zonas costeras representan áreas clave para los estadios avanzados de desarrollo. Estos hallazgos proporcionan información valiosa para la gestión y conservación de la especie en su área de distribución.
The main spawning areas of the marine fish Stromateus stellatus in the central southern zone of Chile were determined. Due to the limited available information on the eggs of this species, their description and characterization were carried out, categorizing them into three groups of different developmental stages. Additionally, their distribution and abundance were analyzed in relation to oceanographic variables such as temperature and salinity. To achieve this, 377 stations with ichthyoplankton samples collected during the FIP 2008-09 cruise were analyzed. This survey covered the area from the Valparaíso region to the Los Lagos region between September and October 2008 and was complemented with hydrographic profiles that allowed for the characterization of the environmental conditions of the study area. Subsequently, Generalized Additive Models (GAMs) were applied to assess the influence of these variables on the distribution and abundance of the eggs. The results revealed that the highest egg concentrations were recorded in the southern part of the study area, specifically between latitudes 39°S and 40°S, and in areas with surface temperatures ranging from 11.5°C to 13.5°C and salinities between 30 and 34 PSU. In the southern zone, a displacement of the eggs towards coastal areas was observed as they advanced in their development, along with a slight northward transport. It was concluded that salinity is a determining factor in the distribution of the eggs and that coastal areas represent key habitats for the advanced developmental stages. These findings provide valuable information for the management and conservation of the species within its distribution range.
The main spawning areas of the marine fish Stromateus stellatus in the central southern zone of Chile were determined. Due to the limited available information on the eggs of this species, their description and characterization were carried out, categorizing them into three groups of different developmental stages. Additionally, their distribution and abundance were analyzed in relation to oceanographic variables such as temperature and salinity. To achieve this, 377 stations with ichthyoplankton samples collected during the FIP 2008-09 cruise were analyzed. This survey covered the area from the Valparaíso region to the Los Lagos region between September and October 2008 and was complemented with hydrographic profiles that allowed for the characterization of the environmental conditions of the study area. Subsequently, Generalized Additive Models (GAMs) were applied to assess the influence of these variables on the distribution and abundance of the eggs. The results revealed that the highest egg concentrations were recorded in the southern part of the study area, specifically between latitudes 39°S and 40°S, and in areas with surface temperatures ranging from 11.5°C to 13.5°C and salinities between 30 and 34 PSU. In the southern zone, a displacement of the eggs towards coastal areas was observed as they advanced in their development, along with a slight northward transport. It was concluded that salinity is a determining factor in the distribution of the eggs and that coastal areas represent key habitats for the advanced developmental stages. These findings provide valuable information for the management and conservation of the species within its distribution range.
Description
Tesis presentada para optar al título de Bióloga Marina
Keywords
Peces Conducta, Peces Investigaciones, Desove inducido y no inducido