Studies on the Life Cycle and Aquaculture Development of Grateloupia sparsa
Date Issued
2010
Date
2010
Author(s)
Yang, Chia-Ying
Abstract
Grateloupia spp. belong to the Halymeniaceae family of Rhodophyta, under Florideophyceae and Halymeniales. In Taiwan, 6 species have been recorded, among them, field-collected G. livida and G. okamurae have been utilized as food popularly. One of the widely distributed species along the northern-east coast of Taiwan and at Penghu. G. sparsa at Penghu is larger in size, smooth and branchless, has attrached local consumer by its out-features and texture as food. Based on thes reason, we investigated its life cycle and growth needs in order to develop its propagation. According to the result of field survey, we observed the season of G. sparsa thalli, including gametophyte, carposporophyte and tetrasporophyte is December to March of next year. It was also observed that tetrasporophyte appeared year round, although its size and population were much reduced in Summer. Germinations of carpospore and tetraspore to form young thalli through discoid crust formation were tested under 3 different temperature (20、25、30℃) with 2 illuminations (13.5與40.5 μE/m2/s). The results showed discoid crusts from carpospores were more difficult than those from tetraspores to form young thalli, but easier to form nodulous filament, a multi-crusts form in tangled by their extending filaments at conditions of higher temperature, no significant difference between different illumination. Discoid crusts from tetraspore germinated more young thalli at 20℃and 40.5 μE/m2/s than other combination of temperature and illumination treatment. Nodulous filaments from carpospore or tetraspore thus formed can be propagated by fragmentation and cultured in SWM-III medium. They can be served as germ resources since the filaments can be blended into small piecies and sprayed on nylon ropes for young thalloid germination. Data of the trials of thalloid germination from nodulous filament showed 3~4 days of settlement and discoid formation under 25 ℃ were needed before the nylon ropes were transferred to 20℃, where young thalli grew faster under aeration and illumination. Young thalli of gametophyte grew to 2.3 cm within 3 months and are ready for field test, but the young thalli of tetrasporophyte failed to grow on rope. Young tetrasporophyte were detached grow the rope due to small discoid size.
Subjects
Red seaweed
Grateloupia sparsa
Lifecycle
Mass culture
seedling
Type
thesis
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