Publication details.


Author(s):M.M. Gil, M. Palmer, A. Grau, S. Deudero, J.I. Alconchel, I.A. Catalán
Title:Adapting to the wild: the case of aquaculture-produced and released meagres Argyrosomus regius
JCR Impact Factor:1.658
Abstract:The performance of juvenile Argyrosomus regius released off the coast of Mallorca Island (Balearic
Islands, Spain) was assessed by comparing the body condition, stable isotope signature and stomach
contents of aquaculture-produced A. regius that had been released, fished and returned by fishermen
after spending from a few days to >1 year at liberty with A. regius reared under controlled conditions
on two contrasting diets (well-fed and unfed). During the first 40 days of the experiment, the
condition index (KR) of the returned A. regius and the unfed A. regius followed the same decreasing
trend. Thereafter, the KR values of the returned A. regius were significantly higher than those of the
unfed A. regius but never reached the values of well-fed A. regius. The δ13C signal of the returned
A. regius clearly increased (in comparison with the well-fed A. regius) after they had spent a few
months at liberty. The temporal pattern depicted by the stable isotopes and the most likely prey
composition inferred from this pattern strongly suggest a shift in diet. The stomach contents of the
returned A. regius that had spent <100 days at liberty consisted almost exclusively of decapods. The
diet of the few returned A. regius that had spent >100 days at liberty consisted entirely of fishes.
Wild A. regius from the remaining fishery on the Spanish coast exhibited the same ontogenetic diet
shift from invertebrates to fishes, but at a smaller size threshold. Overall, the results demonstrated
that culture-reared A. regius experience adverse conditions during the first days after release into
the wild but that at least some A. regius are able to adapt to the natural environment after a few
months at liberty.

Related staff

  • Ignacio A. Catalán Alemany
  • Miguel Palmer Vidal
  • Related projects

  • INIA-Corvina