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Age and growth of Whitemouth croaker (Micropogonias furnieri) larvae and juveniles.

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Author
Braverman, M.
Brown, D.R.
Acha, E.M.
Date
2017

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Alternative Title
Edad y crecimiento de larvas y juveniles de corvina rubia (Micropogonias furnieri)
Abstract
With the aim of studying the age and daily growth of whitemouth croaker (Micropogonias furnieri) larvae and juveniles, the microstructure of sagittae otoliths of 122 individuals 3-25 mm standard or notochord length (SL or NL) size range and 7-92 days old was analyzed. Specimens derived from the turbidity front of the Río de la Plata area (Argentina) the main spawning zone of the species. Counting and measuring of the increments width along the otolith major radius were performed. The length-at-age data were fitted to the linear model (R2 = 0.875) and that of Laird-Gompertz (R2 = 0.881) with L0 = 2.44 and 2.76 mm, respectively, that represents the average length at hatch. With the Laird-Gompertz model an inflection point at 31 days and 10.23 mm SL was obtained. The instantaneous growth rates as a function of length showed a bell shape with an increment of 0.19-0.28 mm day-1 (27 mm SL asymptotic length). The growth rate derived from the linear model was 0.25 mm day-1. A linear relationship between the otolith major radius and length was found. The analysis of increments width as a function of age showed a trend similar to the one described in the Laird-Gompertz model.
Con el objetivo de estudiar la edad y el crecimiento diario de larvas y juveniles de corvina rubia (Micropogonias furnieri) se analizó la microestructura de los otolitos sagittae de 122 individuos de un rango de longitud de 3-25 mm de longitud estándar o notocorda (LS o LN) y 7-92 días de edad. Los ejemplares se obtuvieron en el frente de turbidez del área del Río de la Plata (Argentina), principal zona de desove de la especie. Se realizó el conteo y medición del espesor de los incrementos a lo largo del radio mayor del otolito. Los datos longitud-edad se ajustaron al modelo lineal (R2 = 0,875) y al de Laird-Gompertz (R2 = 0,881) con L0 = 2,44 y 2,76 mm, respectivamente, que representa la longitud promedio al nacimiento. Con el modelo de Laird-Gompertz se obtuvo un punto de inflexión a los 31 días y 10,23 mm LS. Las tasas instantáneas de crecimiento en función de la longitud presentaron forma acampanada con un incremento de 0,19-0,28 mm día-1 (longitud asintótica de 27 mm LS). La tasa de crecimiento derivada del modelo lineal fue de 0,25 mm día-1. Se encontró una relación lineal entre el radio mayor del otolito y la longitud. El análisis del espesor de los incrementos en función de la edad mostró una tendencia similar a la descripta en el modelo de Laird-Gompertz.
Journal
Revista de Investigación y Desarrollo Pesquero
Volume
31
Page Range
5-17
URI
http://hdl.handle.net/1834/14783
Collections
Revista de Investigación y Desarrollo Pesquero

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