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Spawning and fecundity of Jenyns's sprat, Ramnogaster arcuata, a winter spawner in the temperate waters of the Río de la Plata estuary, Argentina–Uruguay

Published online by Cambridge University Press:  25 March 2008

Karina A. Rodrigues ,
Gustavo J. Macchi ,
Eduardo M. Acha  and
María I. Militelli
Karina A. Rodrigues*
Affiliation:
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo Victoria Ocampo No. 1, Mar del Plata (7600), Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Rivadavia 1917, Buenos Aires (1033), Argentina
Gustavo J. Macchi
Affiliation:
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo Victoria Ocampo No. 1, Mar del Plata (7600), Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Rivadavia 1917, Buenos Aires (1033), Argentina
Eduardo M. Acha
Affiliation:
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo Victoria Ocampo No. 1, Mar del Plata (7600), Argentina Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Rivadavia 1917, Buenos Aires (1033), Argentina Departamento Ciencias Marinas, Universidad Nacional de Mar del Plata, Funes 3350, Mar del Plata (7600), Argentina
María I. Militelli
Affiliation:
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP), Paseo Victoria Ocampo No. 1, Mar del Plata (7600), Argentina
*
Correspondence should be addressed to: Karina A. RodriguesInstituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)Paseo Victoria Ocampo No. 1 Mar del Plata (7600)Argentina email: krodrigues@inidep.edu.ar
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Abstract

The reproductive biology of the Jenyns's sprat Ramnogaster arcuata in the Río de la Plata area was studied using macroscopic and histological analysis of ovaries. Samples were collected during two research surveys carried out in June 1998 and June 1999. In addition monthly occurrences of this species from historical data were analysed. Jenyns's sprat specimens were mainly observed in open waters of the estuary during winter months. Most of the females collected during June 1998 and 1999 were in the spawning stage. This pattern differs from fish that reproduce in the estuarine waters of the Río de la Plata, which spawn during spring and summer. These results suggest that conditions of productivity and larval retention in the estuary also remain during winter months. This characteristic might be useful for R. arcuata larvae in avoiding competition with other estuarine spawners. Jenyns's sprat is a multiple spawner with indeterminate annual fecundity. A preliminary estimate of spawning frequency (N = 220) indicated a daily percentage of females with postovulatory follicles of 17.35%, which suggests that this species spawns on average once every six days. Batch fecundity, estimated from counts of hydrated oocytes from 40 females, ranged from 669 to 2026 hydrated oocytes in 1998 and from 570 to 1830 hydrated oocytes in 1999. Batch fecundity was fitted to a linear function of total body weight (without ovary) in 1999. Mean relative fecundity was 234 hydrated oocytes per female gram (ovary free) in 1998 and 155 hydrated oocytes per female gram (ovary free) in 1999, and no significant relationship was observed between this parameter and female size. The dry weight of 100 hydrated oocytes ranged between 3.9 and 6.3 mg, these values being significantly higher than those estimated for other species of the Río de la Plata estuary.

Keywords

Clupeidaehistologyreproductionspawning groundestuarine front
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 2 , March 2008 , pp. 423 - 429
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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