No Thumbnail Available

Site selection for kelp (Laminaria japonica Aresch)

Regional Seafarming Development and Demonstration Project

Year of publication 1989

Pages p. 31

Author Fisheries and Aquaculture Management Division

Product type Project

Category Programme / project report

Edition 1

Synopsis (short abstract) The important commercial seaweed Laminaria japonica was introduced into China in the late 1920s from Hokkaido, Japan. Although commercial production of kelp harvested from its natural habitat has been carried out in Japan for over a century, mariculture of this algae on a very large commercial scale was realized in China in the 1950s. Between the 1950s and the 1980s kelp production in China increased from about 60 to over 250,000 dry weight metric tons annually, making China the largest producer of Laminaria. The success of the kelp cultivation industry has mainly depended on the adoption of three important techniques: (1) the floating raft method of cultivation in which young sporophytes are attached to culture ropes which are fastened to long floating rafts in suitable coastal waters, (2) low temperature cultivation of summer seedlings in which Laminaria sporelings are cultivated over the summer months in cooled water whose temperature is kept below 10° C, and (c) application of ni trogen fertilizer in the open sea. The chief extracts from Laminaria are algin, iodine and mannitol, products widely used in textile, printing, medical and food manufacturing industries. Laminaria is also used to manufacture a variety of products for human consumption and for making various kinds of health foods. The techniques of raft culture and seedling-rearing used for Laminaria production may also be used for cultivating other species of seaweeds, such as Undaria, Gelidium and Eucheuma, as well as for mariculture of scallops, abalone and mussels. Though Laminaria is a cold water species, these growing techniques may be adapted for growing commercial seaweeds in countries located in warmer climates. This manual was specially prepared for the “Training and Demonstration Course on Laminaria Sefarming,” an activity under the UNDP/FAO/NACA Regional Seafarming Development Project (RAS/86/024).

Language English

Also available in:
No results found.

Related items

Showing items related by metadata.

  • No Thumbnail Available
    Project
    Programme / project report
    Site selection for aquaculture: Introduction, technical and non-technical considerations in site selection
    Establishment of African Regional Aquaculture Centre
    1987
    Also available in:
    No results found.
  • No Thumbnail Available
    Project
    Programme / project report
    Soil quality considerations in the selection of sites for aquaculture
    Establishment of African Regional Aquaculture Centre
    1987
    Also available in:
    No results found.
    Soil quality is an important factor in fish pond productivity as it controls pond bottom stability, pH and salinity of overlying water and concentrations of plant nutrients required for the growth of phytoplankton, which is the base of food chain of the fish. A satisfactory site for constructing fish ponds is that where the soil is very deep, with low salinity levels and neutral pH, water infiltration is very low, mineralization of organic matter takes place rapidly, nutrients are adsorbed and r eleased slowly over a long period. Moderately heavy textured soils because of their high surface area and surface charge density posses the above characteristics. Too heavier textured soils such as pure clay may not be satisfactory as they have very high adsorptive property and thereby act as a sink for nutrients like phosphorus which may not be easily released to the overlying water. These soils may also give problems of developments of deep cracks when dry (on draining the ponds) thereby allow ing seepage losses of water. In order to have a clear understanding of the various physicochemical and biological processes which are controlled by the soil in the ponds and to make decisions on the suitability of sites for aquaculture as well as effective managements of the soils for increased productivity of the ponds, one needs to have a good background knowledge of the nature and properties of the soil. This chapter presents basic information on soils, their characteristics and their appli cations to aquaculture. The physicochemical characteristics of water as they affect aquaculture. are discussed separately elsewhere. The science of aquaculture has many similarities with that of agriculture though it is of recent development compared to the latter. Many of the ideas in aquaculture are derived from the experiences in agriculture.
  • Thumbnail Image
Show more

Users also downloaded

Showing related downloaded files
Show more