INVESTIGADORES
LOPEZ Laura Susana
artículos
Título:
Starvation resistance in juvenile freshwater crayfish, Cherax quadricarinatus (Decapoda, Parastacidae).
Autor/es:
CALVO, NS, TROPEA, C, ANGER K., LOPEZ GRECO LS
Revista:
AQUATIC BIOLOGY
Editorial:
INTER-RESEARCH
Referencias:
Lugar: Oldendorf/Luhe; Año: 2012 p. 287 - 297
ISSN:
1864-7790
Resumen:
Strong starvation resistance has been observed in larval decapods developing in
freshwater where food appearance may be unpredictable or poor. The point-of-no-return (PNR)
has often been utilized to quantify the vulnerability of a given species or developmental stage to
starvation. Most studies of nutritional effects on decapods focus on marine species, while there is
less information on freshwater species. We evaluated the effects of starvation on survival, growth,
and hepatopancreas structure of both early (first free-living stage, JIII) and late (1 g, J1g) juveniles
of Cherax quadricarinatus. The experiments consisted of treatments with increasing numbers of
days without food followed by continuous feeding until Day 60 (experiment with JIII) or 90 (experiment
with J1g). Regardless of body size, the time from the beginning of the experiment to first
ecdysis increased with the length of the starvation period. Growth was affected by starvation in
JIII, but it recovered after feeding, while growth could not be fully compensated during sub -
sequent feeding in J1g. PNR values (means ± SD) were 8.7 ± 0.3 and 51.0 ± 1.5 d, corresponding
to 125 and 220% of total stage duration, respectively. In conclusion, juvenile C. quadricarinatusCherax quadricarinatus. The experiments consisted of treatments with increasing numbers of
days without food followed by continuous feeding until Day 60 (experiment with JIII) or 90 (experiment
with J1g). Regardless of body size, the time from the beginning of the experiment to first
ecdysis increased with the length of the starvation period. Growth was affected by starvation in
JIII, but it recovered after feeding, while growth could not be fully compensated during sub -
sequent feeding in J1g. PNR values (means ± SD) were 8.7 ± 0.3 and 51.0 ± 1.5 d, corresponding
to 125 and 220% of total stage duration, respectively. In conclusion, juvenile C. quadricarinatusC. quadricarinatus
are highly resistant to starvation compared to early stages of other decapods. Freshwater envi -
ronments with unstable conditions of food availability may have selected for strong starvation
resistance, i.e. low nutritional vulnerability. This feature gives this species potential importance
for aquaculture and as an invader.