¹Philippine Council for Aquatic and Marine Research and Development Los Baos, Laguna, PHILIPPINES

pcamrd@laguna.net

　

²Nihon University Chiba, JAPAN

k-hotta@ocean.cst.nihon-u.ac.jp

　

³Aquatic Biosystems, Bay, Laguna, PHILIPPINES

aquabios@laguna.net

　

A previous study showed that the growth of the red seaweed, Kappaphycus alvarezii, cultured in floating ratfs significantly increased with fertilization of ferrous sulfate at an application rate of 3 kg/plot/week compared to that of the control.

　

This experiment was conducted in the coastal waters of Calatagan, Batangas (Philippines) to determine the optimum application rate of the fertilizer and its cost-effectiveness.

　

The results showed that the highest growth of the seaweed was attained with application of the fertilizer at 1 kg/raft/week after 30 days of culture. It was also indicated that fertilizing at the said rate was more cost-effective than fertilizing at 2 kg/raft/week.

　

　

Nihon University, College of Science & Technology Funabashi, Chiba, JAPAN

kawanisi@ocean.cst.nihon-u.ac.jp

　

Japan is small country, so it isn't enough for the land. Therefore, when a city and an airport are built, it is difficult to find the land which is suitable for the construction in the land. So, the use of the ocean space is proposed as a new space. Specially, the use of super Large floating structure is being expected. A bigger structure than 10 ha is called as the super Large floating structure. The super Large floating structure is necessary for our country which has various problems such as increase in population and lack of the land.

　

However, a big shadow occurs under the structure when the super Large floating structure is installed on the surface of the sea. The solar light which is necessary for the sea ecosystem is interrupt by the super Large floating structure. This interception is a serious problem for the sea ecosystem. The holes are made on the super Large floating structure, and light pipes are made to go through to introduce solar light in the bottom of the sea. Many light pipes are installed in the constant interval in the super Large floating structure to keep a lot of light. Solar light is introduced in the bottom of the sea under the super Large floating structure, and sea ecosystem can be preserved.

　

Authors were carried out of measuring the light reflection characteristics of the high reflection material used for the light pipe. After that the light transmission characteristics of small model of the light pipe which using high reflection material was measured. Ultraviolet radiation was shut out though a visible ray could be transmitted. The light transmission characteristics when the light pipe is used for the super Large floating structure is argued from these research results.

　

　

Department of Applied Biology & Chemical Technology The Hong Kong Polytechnic University Hong Kong, CHINA

95983046r@polyu.edu.nk

　

During the period 1996-2002, a total of ten species of puffer fish was collected and identified by us in Hong Kong waters, along which a sum of twenty-nine marine fish culture zones had been established since the 1980s. However puffer fish are not among the cultured species as they are toxic and are banned from marketing and consumption by the Hong Kong Government except in some restaurants where puffer fish were imported directly from Japan together with health certificates showing they are safe to eat.

　

Among the ten local species of puffer fish, three were confirmed to be toxic and only one was non-toxic. The annual toxicological profiles of two toxic species revealed that their flesh were actually non-toxic (toxicity less than 10 mouse units per gram in mouse bioassay) throughout the whole year. With proper processing, screening and storage methods, the flesh of most puffer fish is really safe to consume, as it is already a delicacy in Japan and some other cities in China.

　

To fully utilize the local marine resources in Hong Kong, puffer fish should be a good candidate for culture in the near future, as they will have a strong market. Besides the toxic viscera of puffer fish (mainly ovaries and liver) can be explored to produce the valuable tetrodotoxin (a neurotoxin mainly found in puffer fish), which is a potential anesthetic, a promising cancer pain drug, a proposed formulation to treat heroin addiction and a known cancer cell suppressor.