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Investigaciones marinas

versión On-line ISSN 0717-7178

Resumen

PENAILILLO P., Jessica  y  ARAYA C., Miguel. Formation moment and periodicity of the growth microincrements in the otoliths of pejerrey larvae (Austromenidia regia) maintained in the laboratory. Investig. mar. [online]. 1996, vol.24, pp.31-38. ISSN 0717-7178.  http://dx.doi.org/10.4067/S0717-71781996002400003.

In order to know the periodicity and the moment of first growth microincrement formation in the sagitta otolith of pejerrey larvae (Austromenidia regia) were maintained in the laboratory for 26 days. The photoperiod and temperature were maintained constant. Larvae were fed ad libitum with plankton, artificial food for fishes and Artemia sp. nauplii. Five larvae were sacrificed at regular intervals; it standard length was measured then the sagittae and lapillus otoliths were extracted. The otoliths were reading by two readers counting twice each one, with more than three microincrements of diference in the reading were discarded. At larvae hatch present an average standard length of 7,3 mm, reaching an average standard length of 12,3 mm at the final of the experimental period. The regression analysis between the number of microincrements and the age in days, delivery the following parameters: a = 5,86 y b = 0,98, resulting the slope significantly equal to one. The regression intercept indicates that larvae hatching with approximately 6 microincrements, which it was corroborated with the analysis of otoliths of larvae newly hatching.

Palabras clave : Otolith; microincrements; validation; pejerrey.

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