University:
York University
Course:
BIOL 4340 | Fish Biology
Academic year:

2019
Views:

442

Pages:

2
Author:

Nick T.

Module 4: Grow out Types: Intensive: High concentrations of animals. ✓ Supply all Feed Extensive: Very low concentration of animals. ✓ Feed obtained from environment. Location: Land: Easier. Harder for animals to escape Water: Challenging overall. Tank Considerations: Shape Aeration Self-cleaning Recycling Sides Labor costs Recirculating Systems Pros and Cons: "Swirl" Separators Radial Flow Separators Drum Separators primary rotating flow secondary radial flow ➤Nitrification (ammonia to nitrite to nitrate) ✓ Process is: NH3(toxic) -----> NO2- (toxic) > NO3 (non-toxic) Nitrosomas Nitrobacter Good Diameter To depth ratio 5:1-10:1 Nitrification: (Biofloc Technology) Ammonia (NH3) -> Nitrite -> Nitrate. NH3+ 2O2 -> NO3- + H+ + H2O Filter feeders can feed on the nitrifying bacteria. Brown Biofloc do not use light. Green Biofloc needs light and incorporates algae (can "crash") Raceways: Long track-like pond. Requires a lot of water Inconsistent conditions throughout. Mixed-cell Raceways. Bottom center drains Predation will also be a problem in an open area. G Upper-side drains Effluent pumps influent manifolds "Sea Ranching" Expensive High-tech