Mating and hatching behaviour of the lake prawn Palaemon paucidens De Haan (Decapoda, Palaemonidae).

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The mating and hatching behaviour of the Lake prawn, Palaemon paucides, was observed through keeping them in the laboratory during its breeding season. 1) The mating behaviour mostly takes place from about four o'clock in the afternoon to about nine o'clock in the evening. Males and female move actively for about two hours before mating, and males follow the female. However, no pair formation is observed. 2) Within about two hours before mating males come up to the female pausing temporarily, and lift his abdomen and telson slightly up with all of his pleopods vibrating vigorously, or bend his abdomen like a boomerang. 3) While female is making a parturient moult taking one or two seconds, or just after that, some males mount the female's dorsal side for an instant (mounting), but other males do not. Accordingly male's mounting is not necessarily an indispensable process for the mating of this species. 4) The mating is observed just after female's parturient moult, and there are two momentary ways of mating behaviour in this prawn. One is that the male clings to female as if winding himself around the female's cephalothorax and bringing his genital apertures into contact with her genital apertures. In the other behaviour, the upside male parallelly holds downside female bringing both ventral sides into contact together. 5) The hatching behaviour begins at seven or eight o'clock in the evening and ends at nine to eleven o'clock. In this behaviour the ovigerous female lifts her abdomen and telson at an angle of 40-60° against the substratum with all of her pleopods vibrating vigorously. This behaviour is repeated many times every a few to about ten minutes until the female hatches almost all of her eggs.
日本水産増殖学会の論文

Mating and hatching behaviour of the lake prawn Palaemon paucidens De Haan (Decapoda, Palaemonidae).

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日本水産増殖学会 | 論文

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