Scientia Marina, Vol 70, No S2 (2006)

Field comparison of sardine post-flexion larval growth and biochemical composition from three sites in the W Mediterranean (Ebro river coast, bays of Almería and Málaga)


https://doi.org/10.3989/scimar.2006.70s279

Alberto Garcia
Instituto Español de Oceanografía, Málaga, Spain

Dolores Cortes
Instituto Español de Oceanografía, Málaga, Spain

Teodoro Ramírez
Instituto Español de Oceanografía, Málaga, Spain

Castor Guisande
Universidad de Vigo, Facultad de Ciencias, Pontevedra, Spain

Jose Quintanilla
Instituto Español de Oceanografía, Málaga, Spain

Francisco Alemany
Instituto Español de Oceanografía, Palma de Mallorca, Spain

José María Rodriguez
Instituto Español de Oceanografía (Gijón, Asturias), Spain

Juan P. Alvarez
Instituto Español de Oceanografía, Málaga, Spain

Angel Carpena
Instituto Español de Oceanografía, Málaga, Spain

Abstract


Late larval stages of sardine (16-23 mm) were sampled during the 2003 spawning season in their nursery grounds located off the Ebro river mouth, on the Catalan coast, and in two bays of the Alborán Sea coasts, the Bay of Almería and the Bay of Málaga. The daily growth analysis of each sampled population revealed faster growth in the Ebro sardine larvae than in both of the Alboran Sea larval populations. This fact is supported by their greater content with age of DNA, RNA and protein. However, the significantly higher carbohydrate content of the Bay of Almería sardine larvae and a higher Fulton’s index, indicative of energy storage of individuals, in both of the sardine populations sampled in the Bays of Almería and Málaga show evident differences in the daily growth of the Alborán Sea larvae from those originating in the Ebro region. Late larval growth in the Alborán Sea sardine tends to favour an increase in body mass rather than in body length. This study hypothesises that the productivity pulses off the Alboran Sea coasts induced by the north and northwestern wind regimes may be responsible for the growth pulses observed in the otolith microstructure.

Keywords


sardine larvae; Mediterranean; growth; DNA; RNA; proteins; carbohydrates

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