Publication Date:
2021-05-19
Description:
This paper focused on introducing the research results of some principal
characteristics for planning of mariculture development such as the space for
construction of mariculture projects, characteristics of climate, meteorology,
hydrology, dynamics, environmental quality and carrying capacity of the
coastal waters.
The optimum area for intensive mariculture development is 9,460 ha, located
between the depths of 6-20-25 m with the bottom which is a thick sandy mud
- muddy sand ground. At present, the exploited area for mariculture is only
about 780 ha, covering 8.2% of the optimum area, less than 0.5% of total area
suitable for mariculture.
The wind velocity in the coastal zone often ranges between 0.6 – 9.0 m/s. The
wave height often ranges between 0.3-0.9m, within the present safety limit
for construction of mariculture projects. The maximum current velocity
reaches to 29-52cm/s, usually the current velocity is below 10cm/s, satisfying
the limit of dynamics for mariculture development. The water exchange time
in the coastal bays ranges between 6-12 days.
The environment quality in the coastal waters of Khanh Hoa province has
shown signs of local pollution, especially, pollution of sedimental
environment in the developed mariculture, condensed residential and
developed industrial areas. The average toxic index of the water environment
ranges between 0 - 49.2%, the maximum value reaches to 54.5% and in the
sedimental environment, the average value ranges between 21.9 – 67.5%,
and the maximum value reaches to 97.0%.
The total carrying capacity of the coastal waters ranges between 3.13-12.71
tons nitrogen/day. The organic assimilative capacity is 0.01– 0.42 tons
BOD/day. Nowadays, the carrying pressure of the coastal areas of Khanh Hoa
province has reached to 35-55% of the carrying limit of the waters, although
mariculture is not developed yet. Therefore the farming methods and the
policies for management of development must be changed.
Description:
Published
Keywords:
Aquaculture
Repository Name:
AquaDocs
Type:
Journal Contribution
,
Not Known
Format:
pp.67-82
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