Age and daily growth of Engraulis anchoita juveniles from the San Matías Gulf (41° S - 64° W)
Keywords:Anchovy, juveniles, growth, San Matías Gulf, daily increments
Daily growth in length of Engraulis anchoita juveniles from the San Matías Gulf was analyzed. The specimens were caught during a cruise that took place from 4th through 20th December 2006. Individual growth trajectories were reconstructed counting and measuring daily increments width in otoliths. The information obtained was complemented with previous data on length-at-age of small anchovy larvae. Daily growth rates, that ranged between 0.12 and 0.74 mm day-1, averaging 0.33 mm day-1 (SD = 0.19), were similar to the ones reported for juveniles of the species from the Buenos Aires shelf. Hatching dates extended from 1st February through 15th June 2006, with the maximum peak in April. The existence of a close relation between daily growth and ontogenetic development, particularly the influence of metamorphosis on the growth rate is postulated. The largest otolith growth was observed at 60 days at a mean length of 42.2 mm which corresponds to the size of the metamorphosed juveniles. The abrupt decline in growth due to ontogeny would coincide, in most cases, with the advance of the winter season.
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Copyright (c) 2014 Daniel Brown, Ezequiel Leonarduzi, Claudio Buratti
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