Abstract

Different trials on artificial incubation of crayfish eggs (Pacifastacus leniusculus DANA) were carried out using specially designed devices. A part of each female progeny was detached and placed into these devices, while the other part remained attached to the mother pleopods under the same thermal conditions. Eggs were detached from the females at different phases of the embryonic development: embryo with naupliar appendages (mean degrees x days = 490), embryo with thoracic appendage rudiments (mean degrees x days = 620) and embryo with strongly developped eye pigment (mean degrees x days = 853). In both cases, artificial and maternal incubation, reproductive efficiency were improved by means of low temperature during a part of the embryonic development. Maximum efficiency up to stage 2 juvenile and with artificial incubation was found to be: 75,37% for eggs detached from females at 490 degrees x days, 76% at 620 degrees x days, and 74% at 853 degrees x days. These efficiency rates were similar to the ones obtained with the eggs on the female pleopods until independent stage 2. Even though the eggs were detached from the females at an early phase of the embryonic development, it is possible to attain high efficiency with artificial incubation of P. leniusculus eggs by influencing thermal conditions.

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