|Effects of shelter type and food supply frequency on survival and growth of stage-2 juvenile white-clawed crayfish (Austropotamobius pallipes Lereboullet) under laboratory conditions|
Sáez-Royuela, M.; Carral, J.M.; Celada, J.D.; Pérez, J.R. (2001). Effects of shelter type and food supply frequency on survival and growth of stage-2 juvenile white-clawed crayfish (Austropotamobius pallipes Lereboullet) under laboratory conditions. Aquacult. Int. 9(6): 489-497
In: Aquaculture International. Springer: London. ISSN 0967-6120, more
Aggressive behaviour; Controlled conditions; Growth; Juveniles; Survival; Fresh water
|Authors|| || Top |
- Sáez-Royuela, M., correspondent
- Carral, J.M.
- Celada, J.D.
- Pérez, J.R.
Two shelter substrates (fibre-cement sheets and PVC pipes) and two food supply frequencies (once and twice daily) were tested on white-clawed juvenile crayfish in two separate experiments performed under laboratory conditions. Juvenile crayfish were maintained at an initial density of 50 animals per square metre in a flow-through system and fed on fresh Daphnia pulex and a feed formulated for rainbow trout. After 120 days, higher survival (50.5%), but lower growth, was obtained when fibre-cement sheets were provided as shelter. A comparison between food supply frequencies showed a better survival rate (60.5%) when food was provided twice per day although there were no differences in growth after 80 days of trial. The number of animals with chela autotomy is positively correlated (r between 0.33 and 0.48 depending on treatments) with decreases in survival rate. The combination of adequate shelter and frequency of food supply could reduce the agonistic behaviour of juvenile