Transcript Renewable Resource:

Content
• Importance of fish to human
• Cause of over-fishing and its impacts on
the environment
• The ways to ensure sustainability of
fisheries in Hong Kong
Importance of fish to human –
For Commercial purpose
• As food supply
．To compensate essential nutrients absent in
rice (protein, oil, Vitamins and minerals )
．Less cholesterol than the other food
• Marine fishing
．To support the living of about 200 million
employees in related industries globally
Importance of fish to human –
For Recreational purpose
• Fishing as an outdoor activity
• For appreciation and relaxation
Fish Protein ~
• Fish protein is necessary for physical
growth and maintenance (amino acids)
• Fish protein is highly digestible and has
favorable taste
Fish Oil ~
• Polyunsaturated fatty acids in fish oil can
decrease blood triglyceride and cholesterol
• Fish helps maintain a healthy heart and
lowers the risk of stroke and heart attack
Fish Vitamins ~
• Vitamin A is present in fish as retinol,
which is readily absorbed and utilized by
humans
• Vitamin D is present in seafood
Fish Minerals ~
• Fish iron is necessary for hemoglobin
formation in the blood
• Calcium and phosphorus are essential for
bone formation
• Iodine avoid causing goiter and cretinism
and retarding growth
Cause of over-fishing
• Demand of fish increase as population
growth of people
• The massive overcapacity of fishing fleets
which leads to great pressure from
fisheries on the dwindling fish stocks
• New technologies and fishing methods
• Economic development
The number of marine fish catch in
different year
Impacts on the environment
• Threat to ocean health are exacerbated
• Fishing down the food web ( the
systematic removal of the largest top-level
predators )
• Cause serial depletion
• Alter the composition of entire ecological
communities
• Alter the relationships of prey to predators
and thereby pose risks to entire
ecosystems
• Global warming
• Changes in ocean currents
The ways to ensure sustainability
of fisheries in Hong Kong
• Aquaculture Development
• Fisheries Management & Development
• Fisheries Legislation
• Others
Aquaculture Development –
by Agriculture, Fisheries and Conservation
Department
• To identify suitable new species with good
market potential for extension to farmers
(Jade Perch, Tinca sp. and Chinese Long Snout
Catfish)
• To develop feed formulations to replace
trash fish, traditional feed for aquaculture
• To provide assistance on fish culture
techniques and related management
problems encountered
New Species of Fish
← Jade Perch
↑Chinese Long Snout Catfish
← Tinca sp.
• To provide assistance in disease diagnosis
and advice on appropriate treatment
measures
• To provide initiatives
• To conduct regular water quality
monitoring at fish culture zones
• To implement an enhanced phytoplankton
monitoring programme
Fisheries Management &
Development - by Agriculture, Fisheries
and Conservation Department
• The proposed fisheries management
measures include a territorial-wide fishing
license system
• Artificial reefs are able to encourage
growth and development of a great
number and variety of marine organisms
• To commissioned a consultancy study to
examine the technical and financial
feasibility of developing an offshore fishing
for Hong Kong
• To launch the Hong Kong Fish Net
(www.hk-fish.net) to help raising the
public awareness on the need and
importance of fisheries resources
conservation in Hong Kong
www.hk-fish.net
Fisheries Legislation - by
Agriculture, Fisheries and Conservation
Department
• The Fisheries Protection Ordinance (Cap
171) :
．destructive fishing practices (electricity,
explosive, toxic substances, dredging and
suction devices) are banned
Electricity:
．destroy nearby small fish and planktons
Explosive substances:
．destroy nearby small fish and even planktons
．destroy the related food chains and cycles of
the marine ecosystem
Toxic substances:
．poison the neurosystem of the target fish
．would kill nearby small fish and other marine
lives such as corals
Dredging and suction devices:
．affect the seabed
．damage to the fisheries resources
• The Marine Fish Culture Ordinance
(Cap. 353) :
．require all marine fish culture activity
to operate under licence in designated
fish culture zones
Others
• Closed-fishing (April to August)
• Control marine water quality
．Indicate the state of health of marine waters
．Assess compliance with the statutory Water
Quality Objectives (WQOs)
．Reveal long-term changes in water quality
．Provide a basis for the planning of pollution
control strategies
Levels of compliance with key water quality
objectives (WQOs) in Hong Kong Waters
it is equipped with a satelliteaided global positioning
system for accurate location
of sampling stations at sea