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Article . 2010 . Peer-reviewed
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Comparison of seasonal variability in the reproduction of Pacific sardine (Sardinops sagax) from Baja California Sur, Mexico, in the years 1982-1992

Authors: Torres-Villegas, J. René; Ochoa-Báez, Rosa Isabel; Pérez Gómez-Álvarez, Liduvina; García-Melgar, Gustavo;

Comparison of seasonal variability in the reproduction of Pacific sardine (Sardinops sagax) from Baja California Sur, Mexico, in the years 1982-1992

Abstract

[ES] Se estudió el ciclo reproductivo de Sardinops sagax de 1982 a enero de 1992 en Bahía Magdelena B.C.S. Se tomaron muestras a bordo de la flota comercial, registrándose los parámetros morfométricos y la madurez del ovario por histología. El índice gonadosomático se relacionó con los grupos de tallas y las frecuencias de hembras maduras. Utilizando resultados de CalCOFI, se confirmó la temporada de desove entre 1950 y 1966, incluyendo el área de reproducción en la Corriente de California. Se identificó un período reproductivo de diciembre a julio, con un maximo entre enero y febrero y otro período de menor magnitud entre julio y agosto. Las modificaciones en la estacionalidad reproductiva coinciden con cambios ambientales, como el fenómeno de "El Niño 82-83", durante el cual no se registró reproducción. A partir de ese año, el máximo de verano fue disminuyendo hasta desaparecer en 1986. Las hembras con intensa actividad reproductora midieron entre 160 y 210 mm de longitud estandard, evidenciándose su participación cada temporada de reproducción en el período de estudio. La abundancia de huevos de sardina mostró una distribución latitudinal del desove, con variaciones anuales. Hacia el sur se identificó un ámplio período de desove con un máximo consistente en invierno y, en algunos años un máximo menor al principio del verano

[EN] Reproductive seasonality and spawning of Sardinops sagax were studied from January 1982 to January 1992 at Bahia Magdalena, B.C.S. Samples were taken on board the commercial fleet. Morphometric parameters and maturity of the ovaries using histological procedures were recorded. The gonado somatic index was related to the size group and active female frequencies. Using the CalCOFI results, the spawning season was confirmed from 1950 to 1966, including the reproductive area of this species in the California Current. A seasonal reproductive cycle from December to July was described, with the maximum spawning activity during January and February. Another small spawning peak occurred between July and August. Environmental changes influenced reproductive seasonality, like the “ElNiño 82-83” event when no reproduction was recorded. Starting in that year, the summer peak declined until 1986 when it disappeared. Females with intense spawning activity were 160 to 210 mm in standard length. This group was present in all reproduction seasons. Abundance of sardine eggs showed a latitudinal distribution of spawning, with annual variations. Towards the South, a wide spawning period was identified with a consistent winter peak and, in some years, a small peak in early summer

The authors acknowledge the support from Dirección de Estudios de Posgrado (IPN) to the program: "OCEANOGRAFIA PESQUERA DE LOS RECURSOS PELAGICOS EN EL PACIFICO ORIENTAL MEXICANO" (9313811)

10 páginas, 5 figuras, 3 tablas.-- Trabajo presentado en "International Symposium on Middle-sized Pelagic Fish", eds: C. Bas, J.J. Castro y J. Mª Lorenzo

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Spain
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Keywords

Sardinops sagax, Reproduction, Sardina del Pacífico, Pacific sardine, Madurez sexual, Sexual maturity, Reproducción, California Current, Corriente de California

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selected citations
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This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
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impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
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