Long-term changes in maturation of sardine, Sardina pilchardus, in Portuguese waters

Authors

  • Alexandra Silva Instituto Português do Mar e da Atmosfera (IPMA)
  • Sara Faria Instituto Português do Mar e da Atmosfera (IPMA) - Cascais Ambiente
  • Cristina Nunes Instituto Português do Mar e da Atmosfera (IPMA)

DOI:

https://doi.org/10.3989/scimar.03852.03A

Keywords:

maturation condition, sardine, Portuguese waters

Abstract


Long-term changes in sardine maturation were described using samples collected from landings off the western Portuguese coast since 1947. Estimates of the length at 50% maturity (L50) were calculated in 44 years of the study period and proved to be good proxies of the maturation length of first-year spawners (Lp50 of age 0-1 fish). Sardine probability of maturing at a given length declined from the early 1950s to the late 1960s, corresponding to an increase of ca. 2 cm in both L50 and Lp50. This trend reversed in the early 1970s and halted in the early to mid-1990s. The tendency for sardine to mature at a lower length was positively correlated with improved body condition in the growing season preceding maturation. Long-term trends in sardine maturation and body condition were parallel to trends in sea surface temperature reported in the literature. The results suggest that maturation at a lower size is directly influenced by increased temperature, and that higher temperatures improve body condition through increased feeding efficiency or a combination of both. We found no evidence that fishing intensity has contributed to long-term changes in sardine maturation.

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Published

2013-09-30

How to Cite

1.
Silva A, Faria S, Nunes C. Long-term changes in maturation of sardine, Sardina pilchardus, in Portuguese waters. Sci. mar. [Internet]. 2013Sep.30 [cited 2024Mar.28];77(3):429-38. Available from: https://scientiamarina.revistas.csic.es/index.php/scientiamarina/article/view/1472

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