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Revista de biología marina y oceanografía

On-line version ISSN 0718-1957

Abstract

HERNANDEZ-SANTORO, Carola; PEREZ-MORA, Graciela; DIAZ-RAMOS, Eduardo  and  BOHM-STOFFEL, Gabriela. Analysis of macro and microscopic indicators to establish the period of maximum intensity of spawning of anchovy Engraulis ringens of northern Chile. Rev. biol. mar. oceanogr. [online]. 2013, vol.48, n.3, pp.451-457. ISSN 0718-1957.  http://dx.doi.org/10.4067/S0718-19572013000300004.

Although the period of maximum reproductive activity of anchoveta has long been established between July and December, this period can be further defined using microscopical maturity information. This rather unknown biological information is relevant to specify the period of maximum spawning intensity for the management of the fishery. In this work the period of anchoveta maximum spawning intensity is defined using macro and microscopic sexual maturity data from the years 2000 to 2010. The monthly variability of the Gonadosomatic Index (IGS) showed a higher reproductive activity from July onwards reaching a maximum value in August, with high IGS values been observed until December. Microscopical analysis allowed to precise this period between the first half of July and mid October. On the basis of expert judgment, the onset of maximum spawning intensity of anchovy can be established when the Spawning Activity Index (IAD) attains a sustained value of at least 25% during over 2 weeks non necessarily in a row, with a IGS equal or higher than 6%.

Keywords : Engraulis ringens; gonadosomatic index; spawning period; reproductive activity; northern Chile.

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