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Abstract:

Cannibalism by Engraulis anchoita on their eggs was investigated on the spring spawning ground of the northern population of the species during the 1993-1999 period. Egg distribution was patchy and egg cannibalism was only found in a limited number of fish. The maximum number of eggs found in a single stomach analyzed was 433. This value corresponded to 5.1% of the total number of eggs in the stomach of all fish sampled in 1993. Mean number of anchovy eggs per stomach ranged between 3.9 and 10.0 (mean S.E.: 1.5-5.1) for 1993-1996 and 1.3 (mean S.E.: 0.5) for 1999. Consumption of eggs over a 12-h feeding period represented, on average, 15-33% (mean S.E.: 6.2-20.1) of the total egg mortality within the study area in 1993-1996, but only 2% (mean S.E.: 0.8) in 1999. The mean abundance of copepods in the plankton samples (69,000 copepods/m2), especially calanoids, in 1999 was higher than in previous years (6000-53,000 copepods/m2). The same pattern was observed with the number of copepods ingested (400 copepods by fish in the 1993-1996 period and 1200 in 1999). Relationship between consumption rate and density of plankton eggs revealed a marked decrease in the egg cannibalism to low egg density values and an increase of that parameter with the increment of the plankton eggs. There was strong evidence of a decrease in egg cannibalism as copepod density increased. Our results indicate that not only intra-specific predation on anchovy eggs was high, but also anchovy egg cannibalism could be an extra source of energy when the principal food (calanoid copepods) is scarce. In areas where cannibalism was intense, that behavior supplied 91% of the daily energy necessary for reproduction. © 2006 Elsevier B.V. All rights reserved.

Registro:

Documento: Artículo
Título:Egg cannibalism in the northern population of the Argentine anchovy, Engraulis anchoita (Clupeidae)
Autor:Pájaro, M.; Curelovich, J.; Macchi, G.J.
Filiación:National Institute for Fisheries Research and Development (INIDEP), P.V. Ocampo s/n, B7602HSA Mar del Plata, Argentina
Marine Biology Lab. FCEyN, University of Buenos Aires, Argentina
Consejo Nacional de Investigaciones Científicas y Técnicas, P.V. Ocampo s/n, B7602HSA Mar del Plata, Argentina
Palabras clave:Argentine anchovy; Cannibalism; Copepods; Eggs; Engraulis anchoita; Predation; cannibalism; crustacean; egg predation; fish; Argentina; South America; Calanoida; Clupeidae; Copepoda; Engraulidae; Engraulis anchoita
Año:2007
Volumen:83
Número:2-3
Página de inicio:253
Página de fin:262
DOI: http://dx.doi.org/10.1016/j.fishres.2006.09.014
Título revista:Fisheries Research
Título revista abreviado:Fish. Res.
ISSN:01657836
CODEN:FISRD
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01657836_v83_n2-3_p253_Pajaro

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Citas:

---------- APA ----------
Pájaro, M., Curelovich, J. & Macchi, G.J. (2007) . Egg cannibalism in the northern population of the Argentine anchovy, Engraulis anchoita (Clupeidae). Fisheries Research, 83(2-3), 253-262.
http://dx.doi.org/10.1016/j.fishres.2006.09.014
---------- CHICAGO ----------
Pájaro, M., Curelovich, J., Macchi, G.J. "Egg cannibalism in the northern population of the Argentine anchovy, Engraulis anchoita (Clupeidae)" . Fisheries Research 83, no. 2-3 (2007) : 253-262.
http://dx.doi.org/10.1016/j.fishres.2006.09.014
---------- MLA ----------
Pájaro, M., Curelovich, J., Macchi, G.J. "Egg cannibalism in the northern population of the Argentine anchovy, Engraulis anchoita (Clupeidae)" . Fisheries Research, vol. 83, no. 2-3, 2007, pp. 253-262.
http://dx.doi.org/10.1016/j.fishres.2006.09.014
---------- VANCOUVER ----------
Pájaro, M., Curelovich, J., Macchi, G.J. Egg cannibalism in the northern population of the Argentine anchovy, Engraulis anchoita (Clupeidae). Fish. Res. 2007;83(2-3):253-262.
http://dx.doi.org/10.1016/j.fishres.2006.09.014