Location: Natural Products Utilization Research
2016 Annual Report
Objectives
Objective 1: Develop management strategies to mitigate pre-harvest microbial-derived off-flavors in fish cultured in recirculating aquaculture systems (RAS) to reduce off-flavor delayed harvest.
Objective 2: Discover and develop management strategies to mitigate pre-harvest microbial-derived off-flavors in fish cultured in outdoor earthen ponds to reduce off-flavor delayed harvest.
Sub-objective 2.A.: Evaluate and identify the impact of split-pond production practices in reducing or enhancing the incidences and intensities of common pre-harvest off-flavors in channel catfish.
Sub-objective 2.B.: Further evaluation of biofloc technology (BFT) production systems for the benefits in managing common pre-harvest off-flavors in cultured finfish.
Sub-objective 2.C.: Evaluation of a biocontrol approach in reducing the abundance of common off-flavor producing cyanobacteria in catfish production ponds.
Approach
Develop management strategies to mitigate pre-harvest microbial-derived off-flavors in fish cultured in recirculating aquaculture systems (RAS) to reduce off-flavor delayed harvest. Discover and develop management strategies to mitigate pre-harvest microbial-derived off-flavors in fish cultured in outdoor earthen ponds to reduce off-flavor delayed harvest. Evaluate and identify the impact of split-pond production practices in reducing or enhancing the incidences and intensities of common pre-harvest off-flavors in channel catfish. Further evaluation of biofloc technology (BFT) production systems for the benefits in managing common pre-harvest off-flavors in cultured finfish. Evaluation of a biocontrol approach in reducing the abundance of common off-flavor producing cyanobacteria in catfish production ponds.
Progress Report
A relatively new design of outdoor, earthern aquaculture ponds referred to as partitioned aquaculture systems (PAS) or split-ponds is growing in acceptance and use by aquaculturists for the production of channel catfish in the southeastern United States. However, no previous research on the composition of phytoplankton communities and the occurrence and intensities of common off-flavors in catfish such as “earthy” and “musty” within split-ponds has been performed. Analysis of collected water samples during the first year of a two-year study have determined that the blue-green algae which cause earthy and musty off-flavors are present in split-ponds, and the abundance of these types of undesirable blue-green algae are similar to those observed in conventional earthen ponds (non-partitioned). In addition, many other types and abundances of phytoplankton observed to be present in the split-ponds were similar to those previously reported in conventional catfish ponds. Therefore, issues related to management practices for pond water quality (e.g., dissolved oxygen) and undesirable cyanobacteria are expected to be similar as those used for conventional ponds.
Accomplishments
None.
Review Publications
Schrader, K., Hamann, M.T., Mcchesney, J.D., Rodenburg, D.L., Ibrahim, M.A. 2015. Antibacterial activities of metabolites from Platanus occidenatalis (American sycamore) against fish pathogenic bacteria. Journal of Aquaculture Research and Development. http://dx.doi.org/10.4172/2155-9546.1000364.
Xie, Q., Li, S.-X., Liao, D.-F., Wang, W., Tekwani, B., Huang, H.-Y., Ali, A., ur Rehman, J., Schrader, K.K, Duke, S.O., Cantrell, C.L., Wedge, D.E. 2015. Bio-pesticidal and antimicrobial coumarins from Angelica dahurica (Fisch. Ex Hoffm). Natural Product Communications. 2016;10(3):294-306.
Bufalo, J., Cantrell, C.L., Jacob, M.R., Schrader, K.K., Tekwani, B.L., Kustova, T.S., Ali, A., Boaro, C.S.F. Antimicrobial and antileishmanial activities of diterpenoids isolated from the roots of Salvia deserta. Planta Medica. 2016;82:131-137.
