Program and Abstracts(PDF)

Kitadai, Y., and S. Kadowaki. 2004. The growth and N, P uptake rates of Ulva pertusa cultured
in coastal fish farms. Suisanzoshoku, Vol:52. Pp 65–72. (in Japanese with English abstract)
Biological water purification by culturing Ulva pertusa in coastal fish farms was estimated as a
function of light intensity, dissolved inorganic nutrient and water temperature. Ulva pertusa was
cultured from 0.5 m to 8 m depths in coastal fish farms from August to November, 2002. The
maximum growth of thallus area, wet weight and thickness were recorded at 0.5 m depth. The
maximum growth of thallus area reached to 640 cm 2 on August. The maximum growth of thallus
thickness reached to 0.11 mm on November. Average contents of total nitrogen (N) and total
phosphorus (P) in Ulva pertusa reached to 35 mg N/g dry and 2.1 mg P/g dry in October,
respectively. The maximum N, P uptake rates of Ulva pertusa were 3.6 mg N/m 2 /day and 0.19
mg P/m 2 /day at 0.5 m depth, respectively. Michaelis-Menten’s constants of N, P uptake rates
were 26 μg N/l and 8.6 μg P/l, respectively. Downward irradiance of 730 μmol/m 2 /s resulted in
the maximum N, P uptake rates. N, P uptake rates of Ulva pertusa at 25°C were 2.5 mg N 2 /day
and 0.13 mg P/m 2 /day, respectively. Water temperature coefficients of N, P uptake rates were
1.076 and 1.084, respectively. The N and P uptake rates of cultured Ulva pertusa were
formulated from dissolved inorganic nutrients, light intensity and water temperature
characteristics found in coastal fish farms, and the calculated values corresponded well with the
observed values.
Hiraoka, M., S. Shimada, M. Uenosono, and M. Masuda. 2004. A new green-tide-forming alga,
Ulva ohnoi Hiraoka et Shimada sp. nov. (Ulvales, Ulvophyceae) from Japan. Phycological
Research, Vol:52. Pp 17–29.
Ulva ohnoi Hiraoka et Shimada sp. nov. (Ulvales, Ulvophyceae) is described from southern and
western Japan and is characterized by the following combination of features: (i) the large, fragile,
easily torn thalli, which are 30-55 μm thick in the upper and middle regions and often have
microscopic marginal teeth; (ii) the production of zoids in the upper marginal region; (iii) a
regular alternation of dioecious gametophytes and a sporophyte; (iv) the production of freefloating
thalli from torn-off attached thalli, which reproduce vegetatively by fragmentation and
form green tides in summer to autumn; (V) disorderly arranged cells that are polygonal or
quadrangular in the upper and middle regions; and (vi) the chloroplast covering the outer face of
cell, with 1-3 pyrenoids. Ulva ohnoi differs from U. armoricana Dion et al., U. fasciata Delile, U.
reticulata Forsskål, U. scandinavica Bliding and U. spinulosa Okamura et Segawa, which all
possess microscopic marginal serrations, in thallus shape, cell shape or life history pattern. It is
also distinguished from morphologically similar species by sequences of the nuclear encoded
internal transcribed spacers and the 5.85 ribosomal RNA gene and the plastid encoded large
subunit of ribulose-1,5-bisphosphate carboxylase/oxgenase gene. Furthermore, crossing tests
demonstrate that there is a reproductive boundary between U. ohnoi and the most closely related
species, U. fasciata and U. reticulata.
Yokoyama, H. 2010. Monitoring, assessment and management of fish farm environments in
Japan. Reviews in Aquaculture, Vol:2. Pp 1–12.
In Japan, coastal fish farming has become a well-established industry. Intensive cultivation of
finfish, however, generates large amounts of organic waste and nutrients, resulting in
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