Aquaculture systems
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Transcript of Aquaculture systems
Aquaculture Systems
Current Events:
A vaccine for Ich
Types of systems
• Cage
• Raceway
• Pond
• Recirculating Tanks
Cage
• Can move cage to fresh water
• Fish can escape
• Fish can be stolen/released
Movie
Raceway
• Need constant flow of water
• Generally built parallel to rivers
• Necessary for trout
• High water quality
Pond
• Most common method
• Large scale production
• Lowest maintenance
Recirculating tanks
• Uses least amount of water
• Best Temperature control
• Lowest water quality
Recirculating Tanks
• Main Tank
• Bio Filters
• Sediment Tank
• Pumps
• Water in/out control
Main Tank
• Holds fish
• Creates circular water pattern
• Collects from the bottom
• Removes Sediment/waste
Biofilter
• Plastic substrate that bacteria can cling to.
• Bacteria convert toxic ammonia (NH3) in fish waste to nitrite (NO2) and then nitrate (NO3) which is least toxic.
Biofilter
• Bacteria (Nitrosomonas & Nitrobacter) cling to plastic discs
• Aerobic Bacteria• Bacteria control the Ammonia• Takes 2-4 weeks for colonization
• Ammonia →Nitrite →Nitrate• NH3 & NH4
+ →NO2 →NO3
• Most toxic → Least toxic
Sediment Tank
• Has a cone shaped bottom
• Non-soluble solids settle out
• Soluble solids – give the water a brown color – need special filters
Sand filter
• Removes solids
• Sand clogs quickly
• Must backwash daily
• Residue build-up– No longer functional
Aquaculture Tanks
Aerators
• Keep the water circulating
• Keep oxygen in the water so fish do not suffocate.
Equipment
• Seines – nets with predetermined opening sizes to catch or hold only fish larger than a specific size
Shrimp Harvest
• Video