Resources Assessment, Life Cycle and Culture Experiments of Gelidium spp. Found at The North and Northeastern of Taiwan.
Date Issued
2007
Date
2007
Author(s)
Chen, Pei-Yu
DOI
zh-TW
Abstract
Gelidium is one of the economically important algae distributed along the northern and northeastern coast of Taiwan. Fishermen collect the plants from the sublittoral zone by diving. The algae are sun-dried and packed for sale as raw material for agar industry or boiled to make the gelling desert by the local residents. Gelidium resource becomes part of the fishermen’s income.
After a yearly investigation of the natural abundance in 2004, an annual harvest was estimated to be 231.8 metric tons, close to the reported 165 tons of trade in 2003. However, it was far different from the reported 80 metric tons yield of 2004. It revealed the fact that an over harvesting of standing crop could be happened in 2003, leading to the lower harvesting in 2004.
To better understanding of the resources, the local species of Gelidium at Waimusan, Keelung were studied of their life stages and growths in different months of 2005. The morphology of sporangia, spore releasing, spore germination and seedling growth were also studied. It has been observed that only one type of morphologically distinct plants contained carposporangia during spring. The new species was regarded as gametophyte of the various local species, G. amansii, G. japonicum and G. pacificum.
The germination and growth of carpospore and tetraspore of different species were similar. Indoor growth of seedlings was found better in plane seawater, low temperatures and short light period . Outdoor growths of sporophytes, which were tied on the hanging string of cotton, nylon and hemp material, were tested in a closed tank and open pond. It was found that a vertically-hanging of the algal strip of nylon had a better growth than horizontally-hanging and other string material. However, the growth stopped very soon and plants decayed due to the end of the growth season.
Subjects
石花菜、養殖、人工夾苗、生活史
Geldiium
artifical substrate
Culture
Life history
Type
other