Please use this identifier to cite or link to this item: https://hdl.handle.net/2440/16511
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Type: Journal article
Title: The cyst hatching pattern of the Thai fairy shrimp, Branchinella Thailandensis Sanoamuang, Saengphan & Murugan, 2002 (Anostraca)
Author: Saengphan, N.
Shiel, R.
Sanoamuang, L.
Citation: Crustaceana: international journal of crustacean research, 2005; 78(5):513-523
Publisher: Brill Academic Publishers
Issue Date: 2005
ISSN: 0011-216X
1568-5403
Abstract: We investigated factors influencing the hatching of the fairy shrimp, Branchinella thailandensis in relation to brood order, and also responses of cysts to wet and dry periods. Male-female pairs of B. thailandensis were cultured under static conditions at room temperature and fed ad libitum micro-algae (Chlorella sp.). Deposited cysts of the first, sixth and eleventh broods were monitored for cyst hatching under wet and dry conditions. Cyst hatching was scored daily for 5 days after incubation. Freshly laid cysts, immediately incubated, did not hatch in any of the experimental conditions (wet/dry). On the contrary, undried cysts immersed in their parental medium for 4 weeks showed the highest hatching in all brood treatments (76.67, 94.67, and 99.33% of the first, sixth, and eleventh broods, respectively). The cysts of the first brood hatched less successfully than did those of the sixth and eleventh broods. Cyst hatching mostly took place within 24 hours after incubation. The present study shows that a wet period has a strong influence on the cyst hatching success of B. thailandensis. The cysts require a period of retention in the parental medium for 2-4 weeks to complete their embryonic development before hatching. Hatching of the three representative broods showed a different pattern for each brood. The early broods required a longer wet period than did the late broods. In contrast to the hatching behaviour of many other species, drying is not absolutely essential for cyst hatching of this species. © Koninklijke Brill NV, 2005.
DOI: 10.1163/156854005774318123
Published version: http://dx.doi.org/10.1163/156854005774318123
Appears in Collections:Aurora harvest 6
Earth and Environmental Sciences publications
Environment Institute publications

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