4/21/2009. Evaluation of Yellow Perch Grow-out in a 19 o C RAS HISTORY. Materials and Methods

Size: px

Start display at page:

Download "4/21/2009. Evaluation of Yellow Perch Grow-out in a 19 o C RAS HISTORY. Materials and Methods"

Jeffery Blair
5 years ago
Views:

4/2/2009 Evaluation of Yellow Perch Grow-out in a 9 o C RAS Gregory Fischer, Chris Hartleb, James Held, Kendall Holmes, Sarah Kaatz, & Jeff Malison HISTORY

Raised for food markets and stocking uses in outdoor ponds and recirculating water systems. Fillet prices range from $8.70 to $37.40/kg depending on market.

Issues with cold water temperatures during winter for outdoor rearing in ponds.

1 4/2/2009 Evaluation of Yellow Perch Grow-out in a 9 o C RAS Gregory Fischer, Chris Hartleb, James Held, Kendall Holmes, Sarah Kaatz, & Jeff Malison HISTORY Yellow Perch are an important commercially raised cool water fish in the Midwest. Raised for food markets and stocking uses in outdoor ponds and recirculating water systems. Fillet prices range from $8.70 to $37.40/kg depending on market. Market size within 2 months is desirable. Issues with initial larvae feeding for commercial rearing in RAS. Issues with cold water temperatures during winter for outdoor rearing in ponds. Conduct pilot study to evaluate the effectiveness of combining early outdoor pond rearing with indoor RAS for yellow perch grow-out to meet the needs of the food fish market. NADF acquired Lake Mendota strain, pond raised, feed trained, fingerling (avg 27 mm) yellow perch (monosex female and mixed sex). Project conducted inside main Aquatic Barn in Bayfield, WI.

4/2/2009 49,394 L (3,000 gal) Grow-out system consisted of: Culture tanks: Four.4m³ (,500 L; 400 gal) Two 5.

8 m³ (0,757 L; 2,800 gal) Drum filter, fluidized sand biofilter, carbon dioxide stripping column w/fan, oxygen cone and UV

7 L/min (<% Total flow) Tanks were partially covered with foam board.

Photoperiod was controlled by timers and lights to provide 2-6 hours daily. Tanks were monitored daily.

2 4/2/ ,394 L (3,000 gal) Grow-out system consisted of: Culture tanks: Four.4m³ (,500 L; 400 gal) Two 5.7 m³ (5,693 L;,500 gal) Two 0.8 m³ (0,757 L; 2,800 gal) Drum filter, fluidized sand biofilter, carbon dioxide stripping column w/fan, oxygen cone and UV treatment unit. Average water flow was,480 L/min. Replacement water 4.7 L/min (<% Total flow) Tanks were partially covered with foam board. Fish were fed Nelson Silver Cup extruded feed (46% protein, 6% lipid) daily with automatic vibratory feeders. Photoperiod was controlled by timers and lights to provide 2-6 hours daily. Tanks were monitored daily. DO (mg/l), temperature (ºC), & total dissolved gases (%) were measured daily in each tank. ph was monitored daily in each tank. Ammonia-nitrogen (NH 3 -N), nitritenitrogen (NO 2 -N), and reactive phosphorous (PO 4 ) were measured weekly from water samples collected in the RAS sump. Yellow perch length and weights were measured monthly by obtaining 50 randomly sampled perch from each tank. 2

3 mg/l Celsius/ppm/mortality Celsius/ppm/mortality 4/2/ Mixed Sex Yellow Perch Water Quality and Mortality temp oxygen ph morts(x00) Days in RAS 25.0 Mono-sex Female Yellow Perch Water Quality and Mortality temp oxygen ph morts Days in RAS Measured Ammonia-nitrogen (NH 3 -N) and Nitrite-nitrogen (NO 2 -N) in the Yellow Perch RAS system NITRITE AS NITROGEN AMMONIA AS NITROGEN /7/06 2/4/06 2/2/06 2/28/06 /4/07 //07 /8/07 /25/07 2//07 2/8/07 2/5/07 2/22/07 3//07 3/8/07 3/5/07 3/22/07 3/29/07 4/5/07 4/2/07 4/9/07 4/26/07 5/3/07 5/0/07 5/7/07 5/24/07 5/3/07 6/7/07 Monitoring Dates 3

4 Weight (g) Length (mm) 4/2/2009 -Fish Performance Lake Mendota Yellow Perch Mixed Sex and Mono-Sex Monthly Length Increase Lake Mendota mixed sex Lake Mendota mono sex female November December January February March April Month -Fish Performance Lake Mendota Yellow Perch Mixed Sex and Mono-sex Monthly Weight Increase Lake Mendota mixed sex Lake Mendota mono sex female November December January February March April Month -Fish Performance Condition factors were considered excellent for both groups (monosex fish were.42 and.393 for mixed sex fish). Filet yield averaged 47.8% for all groups. Tank densities at harvest were 26 kg/m³ for mixed sex fish and 44 kg/m³ for mono-sex fish. Total mortality was 28% for mixed sex fish and 0.6% for monosex fish. 4

4/2/2009 -Estimated Production Costs Calculated system operating cost without capitol cost was $2,79/month based on commercial utility rates ($0.08/kw/hr) and estimated labor.

8 m 3 ) tanks. Total of 99 kg of feed at an average cost of $970 ($.06/kg) was used during the study. Total estimated production costs, not including capital & fingerling cost, was $4,90.

5 4/2/2009 -Estimated Production Costs Calculated system operating cost without capitol cost was $2,79/month based on commercial utility rates ($0.08/kw/hr) and estimated labor. The actual operating cost at NADF was $,432/month based on an electrical rate of $0.04/kw/hr. This translates into $0.83/L and approximately $3,940 for 6.3 months of operation for two 0,757 L (0.8 m 3 ) tanks. Total of 99 kg of feed at an average cost of $970 ($.06/kg) was used during the study. Total estimated production costs, not including capital & fingerling cost, was $4,90. Based on a market value of $5.50/kg(2.50/lb), the total approximate value of yellow perch raised in the system was $5,550. Conclusion Lake Mendota mono-sex female yellow perch can potentially outperform Lake Mendota mixed sex yellow perch in a 9ºC water RAS. 27 mm (5 inch) fall pond fingerlings can be finished successfully for market in approximately 90 days in a indoor RAS system. Additional research and replicated studies are needed to further investigate grow-out of various strains of yellow perch in RAS and the cost effectiveness of such systems. QUESTIONS?????????????? Contact Information: Gregory Fischer, Facility Manager gfischer@uwsp.edu NADF Webpage: 5