INVESTIGADORES
LOPEZ Laura Susana
artículos
Título:
Nutritional vulnerability and compensatory growth in early juveniles of the red
Autor/es:
STUMPF, L, CALVO, N. PIETROKOVSKYY SS LÓPEZ GRECOCO, L.S.
Revista:
AQUACULTURE
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2010 vol. 304 p. 34 - 41
ISSN:
0044-8486
Resumen:
The objective of this study was to investigate the nutritional vulnerability of stage III juveniles of the
freshwater crayfish Cherax quadricarinatus. The point-of-reserve-saturation (PRS50), the point-of-no-return fish Cherax quadricarinatus. The point-of-reserve-saturation (PRS50), the point-of-no-return
(PNR50) and the compensatory growth capacity in intermittently fed individuals were determined. The 50) and the compensatory growth capacity in intermittently fed individuals were determined. The
juveniles were subjected to different feeding protocols for the PRSPNR experiment and the intermittent PNR experiment and the intermittent
feeding experiment. Fifty percent of the juveniles were able to successfully molt to the following stage
(PRS50) after 3.53 feeding days and failed to molt to the following stage (PNR50) after 4.28 starvation days. In 50) after 3.53 feeding days and failed to molt to the following stage (PNR50) after 4.28 starvation days. In
the intermittent feeding experiment, stage III juveniles achieved similar growth and survival compared to
those kept under the continuous feeding regimen. Full compensatory growth occurred during the restriction
period in the initially fed group and during the refeeding period in the initially starved group. This is the first first
study on PRS, PNR and compensatory growth in a subtropical freshwater crayfish. Moreover, it shows that fish. Moreover, it shows that
stage III juveniles are unable to molt to the following stage without feeding, requiring at least two feeding
days to molt and survive. Feeding seems to be necessary at the beginning of stage III, when energy reserves
are probably accumulated. On the other hand, the capacity to fully compensate may lead to a reduction in the
amount of food supplied, thereby diminishing the costs of production and improving water quality. In
conclusion, the high level of compensatory growth capacity, together with the values of PNR50 and PRS50 50 and PRS50
obtained in this study, could serve as useful indices for assessing brood quality and food quality in
aquaculture.
© 2010 Elsevier B.V. All rights reserved