Distribución de desovantes y estimación de variables reproductivas de la merluza (Merluccius hubbsi) al norte de 41° S en junio-julio de 2013.
The reproductive area, spawning frequency, fecundity and oocyte dry weight of the Northern hake stock in June-July 2013 were analyzed. Results indicated that the reproductive activity of the species in the Buenos Aires region during those months took place, mainly, north of 37° S, near the 50 m isobath in a 6-13.5 °C temperature range that coincides with a bottom thermal front. Values of batch fecundity (between 56,431 and 2,203,472 hydrated oocytes), relative fecundity (between 175 and 970 hydrated oocytes g-1) and spawning frequency (14 days) were in the same range than those obtained in May in previous years. The relationship between batch fecundity and total length, gutted weight, age and hepatosomatic index (HSI) variables were positive in all cases, which indicates an increase in the number of eggs produced with the maternal characteristics analyzed. The oocyte dry weight, that showed a significant relationship with length, gutted weight, age and the HSI, suggests that the largest specimens invest energy to increase the amount and improve the quality of the oocytes produced.
| Main Authors: | , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Spanish / Castilian |
| Published: |
2017
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| Subjects: | Fecundidad, Distribución, Reproducción, Desove, Poblaciones desovantes, Merlucciidae, Merluccius hubbsi, Merluza, ASFA_2015::F::Fecundity, ASFA_2015::D::Distribution, ASFA_2015::R::Reproduction, ASFA_2015::S::Spawning, ASFA_2015::S::Spawning populations, |
| Online Access: | http://hdl.handle.net/1834/10989 |
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