Edad, crecimiento y mortalidad natural de la sardina austral Sprattus fuegensis (Jenyns, 1842) en el mar interior de Chiloé, Chile

Translated title of the contribution: Age, growth and natural mortality of the Patagonian sprat Sprattus fuegensis (Jenyns, 1842) in Chiloé inland sea, southern Chile

Francisco Cerna, Elson Leal, Amalia López, GUIDO PLAZA PASTEN

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Growth parameters (L, K, and t0) and natural mortality of the Patagonian sprat (Sprattus fuegensis) Chiloé inland sea were estimated. This area corresponds to the northern limit of the species distribution in the South Pacific Ocean. A total of 1,584 otolith were analyzed between July 2005 and December 2006. A covariance analysis ruled out significant differences (P = 0.654) in the otolith size-fish length relationship between males and females. The otoliths showed high monthly proportion of hyaline edge type in August 2005 and from July to October 2006. The hyaline band formation from mid-winter to spring coincided with the breeding season extending from September to December. This suggests an annual periodicity of annuli formation, likely as a consequence of channeling energy into reproduction. The growth parameters were L= 17.71 cm; K = 0.78 yr-1; and t0 = -0.46 yr, while the maximum observed age was 6 years. Natural mortality given growth parameters and species maturity, was estimated at 1.0 yr-1. The modal decomposition of monthly length distribution, analyzed by a statistical-numerical algorithm (MIX approach) gave similar results to those obtained from otolith readings.

Translated title of the contributionAge, growth and natural mortality of the Patagonian sprat Sprattus fuegensis (Jenyns, 1842) in Chiloé inland sea, southern Chile
Original languageSpanish
Pages (from-to)580-587
Number of pages8
JournalLatin American Journal of Aquatic Research
Volume42
Issue number3
DOIs
StatePublished - 1 Jan 2014

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