Introduction
Besides the natural coastal area flood prevention function, lagoon in Tainan has the functions of stabilize waves and currents in the inland sea. It also acts as natural marine ranch. However, due to the change of sandbank, the amount of water in the inland sea has decreased and the inland sea become shallower and smaller, and some oyster bamboo stands are buried in the sand, affecting the livelihood of local fishermen.
The decrease of seawater also causes the water temperature to change easily, which increases the disease rate of farming species. The optimal temperature for oysters and clams to grow must be below 28 ° C. Hight temperature will result in poor harvests. At present, oyster farming in Tainan still follows the traditional methods. How to respond to the changes in the coastal environment in the south and its adjustment strategies are currently important issues.
The decrease of seawater also causes the water temperature to change easily, which increases the disease rate of farming species. The optimal temperature for oysters and clams to grow must be below 28 ° C. Hight temperature will result in poor harvests. At present, oyster farming in Tainan still follows the traditional methods. How to respond to the changes in the coastal environment in the south and its adjustment strategies are currently important issues.
Our research
Comparing the oyster production and output value between the national and Tainan areas over the years, the national output peaked in 1999 and then declined year by year. On the other hand, the output of Tainan from 1996 to 2012 was stable. In terms of output value, the national output value in 1998 was the lowest in the country, and then increased year by year. The trend of Tainan region is consistent with the national output value trend. Summarizing the relationship between the two, it can be found that although the output is gradually decreasing, the output value is increasing. It means that the market demand for oysters is greater than the supply. It is hoped that the unit price of oysters will be increased to replace production by monoculture of oysters.
Monoculture of oyster refers to a single detached state when the development of oysters begins from the stage of attachment of juveniles, and its subsequent growth and storage space is also sufficient. Therefore, the shell of the oyster can grow evenly and broadly to form a single oyster. There are two methods to from a single oyster. One is the physical method. After the oyster babies are attached, the babies are removed from the attachment base in various ways to continue breeding. The other is by chemical, which is to use drugs (epinephrine, etc.) during the juvenile stage, so that juveniles can grow directly into a single state without attachment. (Dai, Yeo , 2012).
According to Yu and Shi (1994), comparing the economic benefits of single oysters and traditional flat-bottom farming, the biggest difference is that single oyster farming saves the peeling process and increases the value of oysters. Although the cultivation period is longer, the average profit is still higher than that of traditional one. Cigu district has different water levels, so there are traditional hanging type, standing shed type and floating stilt frame, in Beimen district, there is mostly flat hanging type.
According to Yu and Shi (1994), comparing the economic benefits of single oysters and traditional flat-bottom farming, the biggest difference is that single oyster farming saves the peeling process and increases the value of oysters. Although the cultivation period is longer, the average profit is still higher than that of traditional one. Cigu district has different water levels, so there are traditional hanging type, standing shed type and floating stilt frame, in Beimen district, there is mostly flat hanging type.
Related News
NCKU USR team help the local to increase the competitiveness of the oyster farming within industries
2019-11-06 NCKU News Center One of our team member, Prof. Chang Yi introduce the topic to the master's course on climate change and marine environmental protection, and lead students to explore the challenges facing the oyster industry. The course integrates scientific knowledge such as coastal change, coastal management and oyster farming. See Chinese Version for news |