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1 April 2007 EFFECTS OF STAGE 2 JUVENILE REMOVAL FREQUENCY ON FINAL SURVIVAL RATES IN ARTIFICIAL INCUBATION OF CRAYFISH EGGS (PACIFASTACUS LENIUSCULUS DANA. ASTACIDAE)
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Abstract

In artificial incubation of astacid crayfish eggs, stage 2 juveniles must be removed by hand from incubators and a significant decrease in survival rates has been recorded between hatching (stage 1) and the first moult (stage 2). To reduce these losses, eggs of Pacifastacus leniusculus were incubated at a density of 6.6 cm−2 and different removal frequencies of stage 2 juveniles from the incubators were tested: every 5, 4, 3, and 2 days, daily and only once at the end of incubation. Formaldehyde was used to control growth of fungi. The best final survival rate (88.6%) was obtained when stage 2 juveniles were removed daily from the incubators. There were no significant differences nor between removals every 2 and 3 days (79.6% and 76.5%, respectively) neither between 4 and 5 days (72.6% and 69.8%, respectively). Considering all treatments, final survival rates decreased as juvenile removal was delayed up to only one removal at the end of incubation.

P. M. MELENDRE, J. D. CELADA, J. M. CARRAL, M. SÁEZ-ROYUELA, and A. AGUILERA "EFFECTS OF STAGE 2 JUVENILE REMOVAL FREQUENCY ON FINAL SURVIVAL RATES IN ARTIFICIAL INCUBATION OF CRAYFISH EGGS (PACIFASTACUS LENIUSCULUS DANA. ASTACIDAE)," Journal of Shellfish Research 26(1), 201-203, (1 April 2007). https://doi.org/10.2983/0730-8000(2007)26[201:EOSJRF]2.0.CO;2
Published: 1 April 2007
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