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Ovipositional Behaviour of the Swimming Crab, Portunus trituberculatus (Miers, 1876) (Decapoda, Portunidae): Implications for Broodstock Management in a Hatchery

Katsuyuki Hamasaki and Kyohei Fukunaga
Crustaceana
Vol. 81, No. 7 (Jul., 2008), pp. 813-822
Published by: Brill
Stable URL: http://www.jstor.org/stable/20111452
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Ovipositional Behaviour of the Swimming Crab, Portunus trituberculatus (Miers, 1876) (Decapoda, Portunidae): Implications for Broodstock Management in a Hatchery
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Abstract

Ovipositional behaviour of the swimming crab, Portunus trituberculatus, was observed in the laboratory. Females were reared in tanks with sand on the floor. Prior to oviposition, females bent back their abdomen, both sides of which were covered with four pairs of erect exopods of the pleopods. This formed a cavity between the abdomen and the sand. Eggs were extruded onto the sand from two gonopores, similar to paste being squeezed from a tube. The extruded eggs sank into a depression in the sand under the abdomen and they then attached to the ovigerous setae of the endopods of the pleopods, which were moving back and forth. Some of the extruded eggs that spread under the body did not attach to the ovigerous setae of females that were dug out of the sand for observation, or of females that could not bury themselves sufficiently into the sand. Consequently, we conclude that a sandy substratum is vital for successful egg attachment in swimming crabs used for broodstock in a hatchery. /// Le comportement d'oviposition du crabe nageur Portunus triberculatus a été observé en laboratoire. Les femelles ont été élevées dans des aquariums avec un fond de sable. Avant l'oviposition, les femelles déplient leur abdomen dont les deux côtés sont couverts avec les quatre paires d'exopodes des pléopodes, dressés. Cela forme une cavité entre l'abdomen et le sable. Les œufs sont extrudés dans le sable au niveau des deux gonopores, comme une pâte sortant d'un tube. Les œufs extrudés coulent dans une dépression dans le sable sous l'abdomen et sont alors attachés aux soies ovigères des endopodes des pléopodes qui se balancent en va et vient. Certains œufs extrudés ne se sont pas attachés aux soies des femelles qui avaient été sorties du sable pour l'observation, ou des femelles qui n'ont pas pu s'enfoncer suffisamment dans le sable. En conséquence nous pouvons conclure qu'un substrat sableux est vital pour un attachement satisfaisant des œufs chez les crabes nageurs utilisés comme géniteurs dans les écloseries.

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