WorksheetsMud Crab Culture Revision
Total questions: 13
Worksheet time: 7mins
Four species of mudcrab has been the focus of both commercial fishries and aquaculture production. Which of the following species is important to Brunei Darussalam?
Scylla olivacea
Scylla tranquebarica
Scylla serrata
Scylla paramamosain
State one reason why mud crab has high consumer demand and market price.
High meat yield
Highly cannibalistic
Hatchery produced crablets easily obtained
Highly innovative culturing technique
How many spines does Scylla serrata has between its eyes?
5
6
9
4
State the function of the fourth legs found in mud crabs.
For crushing food
For cutting food
For walking
For swimming
The following image is an image showing a male mudcrab.
True
False
State the stage in the lifecycle of the mudcrab after the eggs hatched.
Zoea
Megalopa
Crablet
Post Larvae
Sub-adult and adult crabs eat attched bivalves, marine detritus, molluscs, crustacean and fish. Which type of feeding habit does mudcrab exhibit?
Carnivorous
Herbivorous
Omnivorous
Piscivorous
One of the major challenge in crab culture in open system is cannibalism. Which of the following is a strategy to significantly improve surivival rates in culture?
Culturing crabs at higher density
Culturing crabs in individual containers
Provision of adequate amount of food for crabs
Provision of adequate hiding space for crabs
Which of the following best describe the premolt or proecdysis stage in crab moulting cycle
Stage where crabs gets out of old shell and take up water rapidly
Stage where hard outer layer of shell separates from membranous layer
Stage where crab expands its body and limbs by taking in water
Stage where the carapace hardens but walking legs are still flexible
Which of the following environmental factor affects hatching time and release of larvae in mudcrab reproduction?
Salinity
pH
Temperature
Dissolved oxygen
Which of the following describes the on-growing sytsem shown in the picture?
Pond culture
Pen culture
Cage culture
Cellular system culture
Which of the following best descibe the process where mudcrabs are identified, held and fed for a period of few weeks before they are eventually marketed.
Crab Fattening
Crab Holding
Crab Boarding
Crab Loading
Which of the following problem in mudcrab culture can be reduced by the provision of essential fatty acid in diet and optimum water temperature in culture.
Limitations of seed supply
Incomplete moulting
Cannibalism
Disease transmission
