Group Summaries - Engineering

 

May 22-24, 2006 UF Tropical Aquaculture Laboratory

This Information Exchange Group did not meet.

 

June 5-7, 2005 Virginia State University

Attendees:
      There were 20 participants from 11 institutions.
Facilitator:      Dr. Jimmy Avery

SESSION SUMMARY:


Craig Tucker – MSU and SRAC

· Currently working on Partitioned Aquaculture Systems with Clemson University.  There are two versions: a high tech version and a low tech version.  MSU is working on the low tech version.  This system works but disease has been a problem.  The main disease issue has been proliferative gill disease. Currently using triploid smallmouth buffalo in the water treatment side of the system to control Dero worms.   Blue catfish survived better than channel catfish but F.columnaris is still a problem. The systems are currently stocked with hybrid catfish.
· USDA ARS CGRU researchers are working with a U-tube aerator.   The unit is in place but researchers are still struggling with efficiency.  Researchers are also looking at aeration placement.
· There is a SRAC project that is looking at in-pond raceways.  The raceways are installed and are stocked.
Craig Watson – UF
· There is growing interest in raising ornamentals in low salinity recirculating systems.  This requires zero discharge.  The two technologies being examined are the LSU and the NCSU recirculating systems.

 

June 6-8, 2004  University of Arkansas at Pine Bluff

Attendees: 
Not Available
Facilitator:  Philip Ray Pearson, USDA/ARS, Pine Bluff
Co facilitator:  Ruguang Chen, UAPB

SESSION SUMMARY: (* indicates a discussion topic)

Growing Environment
· Sock Saver
· U-tube aerator
· Partitioned Aquaculture System
· * Odor Control/Air Quality in alligator houses
· * Use of Heat Energy Contained in waste water discharged from alligator houses
Best Management Practices
· Feed Protein Content
· Stocking Rate
· Water Storage
· Effluent Treatment
· Water Use
Innovative Use
· Use abandoned poultry houses for production of hybrid striped bass
· Biofertilizer and biofuel from algae harvested from ponds
· Geothermal Temperature Control Methods
Harvest
· * Improved propulsion method for crawfish boats
· Electric Seine:  Electrical field repels fish
· In-Pond Fish Grader
· Seinitizer:  Sanitizing system for seines
Processing
· Using temperature to prepare oysters for shucking
· Using pressure to prepare oysters for shucking
· * Crawfish peeler
Farm Management
· Using digital image analysis to estimate fish kill
· Auto-Information System for Pond Management
· Trawl for use in obtaining samples of fish population

 

March 9-11, 2003 Texas A&M University

Attendees:  Not available
Facilitator  Not available

SESSION SUMMARY
:

The current status of investigations involving the partitioned Aquaculture System (PAS) at various locations was the primary topic of discussion.
· Robert Romaire indicated LSU has been operating their PAS system for over 2 years and have achieved production of approximately 14,000 lb/acre. He indicated their results with blue catfish have been much better than that obtained with channel catfish.
· Craig Tucker indicated they are looking at modifying the basic infrastructure of existing ponds to confine the fish in a smaller area.
· LSU has been evaluating remote control aircraft as a potential means of controlling avian predators, as well as using geothermal water to extend the breeding season of catfish.

 

March 17-22, 2002 University of Puerto Rico

Attendees:
  Not available
Facilitator:  Not available

SESSION SUMMARY:

· Charlie Shultz mentioned that the University of the Virgin Islands offers an intensive shortcourse in aquaponics during the summer.

 

March 19-20, 2001 Mississippi State University

This IEG did not meet.

 

March 29-30, 2000 Louisiana State University

This IEG did not meet.

 

March 15-16, 1999 Kentucky State University

This IEG did not meet.

 

March 15-17, 1998 Clemson University

This IEG did not meet.

 

March 24-26, 1997 University of Tennessee

This IEG did not meet.

 

March 24-26, 1996  University of Arkansas, Pine Bluff

Attendees:  Dr. Wang, Hawaii; Dr. Morrison, SE Fisheries Lab; Jack Whetstone, SC; Dr. Davis, TX; Greg Whitis, Auburn; John Collier, Clemson
Facilitator:  John Collier

SESSION SUMMARY:


Dr. Wang, Hawaii
· reported that he has developed protocols for producing algal cultures from sea water that are 95% desired species without sterilization and inoculation.  The process involves manipulating water conditions to favor the desired species and takes about 5 days.
Dr. Morrison, Southeast Fisheries Lab, Alabama
· reported that they have developed and are using a raceway below a hillside pond to grow catfish from swim-up fry to 1.5-inch fingerlings for stocking hill ponds.  Fish are grown at 1000/cubic foot and survival has been excellent.
Jack Whetstone, Waddell Center, South Carolina
· reported that they are working on systems to improve water quality in shrimp ponds.  He reported that many high-density ponds were having difficulties with water quality.
Dr. Davis, Texas
· reported that effluent problems are major in shrimp ponds.  Minor design changes greatly improve the situation, but these are difficult in existing ponds.  He has had many requests for engineering publications prepared by LSU.
Greg Whitis, Auburn
· reported that Extension Aquaculturist, Industry, and producers have developed a self-cleaning, auto-calibrating oxygen probe that can go six months without maintenance and transmits data to a computer over telephone lines.  They currently have over 100 of these systems in operation.
John Collier, Clemson
· reported that they have run the Partitioned Aquaculture System (PAS) for one season with excellent results.  The system was run at conventional pond loading rates to gather background data and check out mechanical systems.  Growth was the same as control ponds and harvest and predation made much easier. This year they will stock at twice normal rated (10,500/Ac ) and use tilapia as filter feeders for algae removal.

 

March 18-20, 1995  Auburn University

Attendees:
  Not available
Facilitator:  John Collier

SESSION SUMMARY:

· Alabama (Auburn University). Reported on in-pond raceway and recirculating pond-raceway research. The in-pond raceway (IPR) research has produced channel catfish and tilapia in high density polyculture (>400 m3) with outstanding growth rates. The IPR system is testing methods remove fish wastes and thereby reduce the impact on the pond. A tube settler system has proven to be the simplest and most effective method tested for removing solid wastes from the IPR. Economic evaluation of the IPR has yet to be done. The recirculating pond-raceway research involved pure oxygen injection and waste removal in an above ground low-volume raceway. Water was pumped back to the pond after passing through the raceway system. This system had disease problems and does not appear to be economical viable for the production of channel catfish. 
· South Carolina (Clemson University). Reported on a partitioned aquaculture system. Commercially valuable fish are reared on artificial feed in a high density raceway type partition in the system. Next solid wastes are settled and removed in a second partition. Then fluid wastes are removed by rapid or log phase growth of phytoplankton in a series of long canal type partitions. Finally surplus phytoplankton is removed by filter feeding fish in another partition of the system. Water is moved through the system and volume controlled by means of a hydraulic paddlewheel. Computer generated models and small scale systems have been tested. One acre replicated system pond units will be tested in 1995. 
The main research need identified was a need to understand the economics of alternative recirculating systems. 

 

March 13-15, 1994  Texas A&M University

This IEG did not meet.