MODULE 7 Flashcards
What are the problems in need of solving as time progresses?
With the population projected to reach around 8.2 Billion in 2025, we are faced with an increasing demand and a decreasing supply of natural resources.
What is the significance of aquaculture?
We now farm more fish than we catch as opposed to our traditional system of capture fisheries
development that meets the needs of the present without compromising the ability of future generations to meet their own needs
Sustainable Development
What does ASIN stand for and what are its objectives?
Agriculture Sustainability Initiatives for Nature, Inc. and its goal is to provide high quality and traceable agricultural produce using sustainable and environmentally sound practices.
What are some of the problems that the oyster industry is facing?
Prevalent cases of red tide in oyster hotspots, particularly Aklan and Pangasinan
What is the scientific and common name of the slipper-shaped/Philippine Cupped Oyster?
Crassostrea iredalei/”Talabang Tsinelas”
Why is the slipper-shaped oyster commercially desirable?
It grows at a faster rate to a larger size and has straight shell margins which make them easier to open.
How long is the average culture period for oyster farming?
about 9 months
There is great development potential in oysters due to their what?
Tolerance of estuarine conditions and abundant spatfall
What are some of the water conditions that oysters thrive in?
- Clean brackish water whole year round (Intertidal zones)
- water is usually green to blue-green in color which indicates the presence of phytoplankton
- salinity of 17-25 ppt
- temperature of 27-32 degrees celsius
- water depth of 1.5-2.5m (traditional) and 5.0m (non-tradittional culture methods)
What are some measures that need to be implemented in cultivating oysters?
- No excessive flooding
- must be protected by a natural barrier or a breakwater to prevent damages to farm structure specially during typhoons
Sustainability in aquaculture correlates with (3) other classifications
Environmental, Economic, Social and community
How much oysters has ASIN been able to cultivate in Quezon?
2 tons of oyster meat per month
What is the main benefit that oysters are known for?
They are filter feeders, meaning they can clean out water.
What are some of the effects of oyster culture on estuarine physico-chemical dynamics
- Reduction in flow
- Increase in sedimentation
- Decrease in water depth
- Decrease in circulation
- Affects water quality parameters such as DO
- May modify estuarine dynamics and habitat
What are oyster growing methods that are suitable for singles?
- Rack and Bag Culture
- Floating Culture
- Suspended Nets
What are suitable oyster growing methods for shellstock?
- Bottom Culture
- Stake Culture
- Longline Culture
What is a sign that the oyster farming method one is using is sustainable?
- The river depth is not decreasing and there is a 0.5 meter distance between the cultch and the floor of the river.
- There are plenty of fish as it also serves as a nursery.
- There is security as you can lift the cultch up to supervise the growth of the oysters.
Which is more sustainable? Raft or Stake Method
Raft Method
Pediveliger
the stage where the oyster grows legs and attaches to a broodstock
