Effects of breeder reuse on the reproductive potential of the signal crayfish (<Emphasis Type="Italic">Pacifastacus leniusculus</Emphasis> Dana. Astacidae) in culture |
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Authors: | J D Celada J I Antolín J M Carral J R Pérez M Sáez-Royuela |
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Institution: | (1) Department of Animal Production II, Universidad de León, Campus de Vegazana s/n, León, 24071, Spain |
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Abstract: | The aim of this work was to evaluate the reproductive potential of the signal crayfish (Pacifastacus leniusculus Dana) in the second cycle under culture conditions. The experiment was carried out using 5,653 animals placed in six earthen
ponds in August. Three treatments were performed, each in two ponds: breeder reuse (males and females used in the former reproductive
cycle), female reuse (new males from the wild and females used in the former reproductive cycle) and new breeders (males and
females from the wild). In April, close to hatching, egg-bearing females were transferred to the hatchery. Mortality of the
reused breeders (around 30% of females and 41.4% of males) was significantly higher than that of the new breeders (11.4% of
females and around 19.5% of males). The proportion of berried females close to hatching was significantly higher for the new
ones (77.4% of the initial number), and the percentage of new females with a large quantity of eggs (63.6%) was higher than
that of the reused females (25.6 and 20.9%). Differences among the percentages of females without eggs in the new breeders
(11.2%) and the rest of the treatments (30.7 and 39.6%) were significant. The reproductive capacity of reused females was
not improved by providing new males. Considering the number of females initially stocked into ponds, mean yield per new female
was greater than that of the reused females, mainly due to the higher mortality recorded in the reused broodstock. Although
the yield that can be obtained using the same breeders in two reproductive cycles drops in the second one, the production
was not negligible. |
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Keywords: | Astacid crayfish Pacifastacus leniusculus Reproductive efficiency Broodstock management |
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