Redox potential in freshwater and seawater culture ponds: determination methodology behavior
Keywords:
soils electro negativity, Ictalurus punctatus, Litopenaeus vannamei, pond cultureAbstract
Little is known about the behavior of oxidation-reduction potential in aquaculture ponds and its relation with yields. Such information may be useful in managing ponds by avoiding the production of reduced and potentially toxic substances. Difficulty in collecting a sample that allows the reading of the redox potential value within the desired range is a constraint. This study proposes a methodology that uses a sample collector adjusted to the needs of this type of work. The device was built with available materials, is easy to build and can be operated by a single person. The method allows the viewing of the sample for the introduction of the electrode in the desired range. The study was carried out in two properties in Santa Catarina state: a pond in a catfish farm and another in a marine shrimp farm. Redox potential behavior was observed for 50 days during a production cycle, when ponds were sampled in twelve sites. In both ponds, redox potential presented different behavior and distinct management may have influenced it. In the catfish pond, redox potential was stable, although negative, whereas in the shrimp pond, values were very low and tended to stabilize after 20 days of observation.
References
Avnimelech, Y., Mozes, N., Diab, S., Kochba,M. 1995 Rates of organic carbon and nitrogen degradation in intensive fish ponds. Aquaculture,134: 211 í 216.
Avnimelech, Y. 1999 On the use of microe l e c t r o d e s i n f i s h p o n d s e d i m e n t s Aquacultural Engineering, 21(2): 71-83.
Avnimelech, Y. e Ritvo, G. 2003 Shrimp and fish pond soils: processes and management.Aquaculture, 220: 549 í 567
Avnimelech, Y, Ritvo, G., Kochva, M. 2004 Evaluating the active redox and organic fractions in pond bottom soils: EOM, easily oxidized material. Aquaculture, 233: 283 í 292.
Boyd, C. E. 1995 Bottom soils, sediment, and pond aquaculture. Chapman and Hall, New York 348 p.
CHIEN, Y. 1989 The management of sediment in prawn ponds. In: Anais do III Simpósio brasileiro In: Anais do III Simpósio Brasileiro sobre Cultivo de Camarão. João Pessoa. v.1.p. 219-243.
Delgado, P.C., Avnimelech, Y., McNeil, R., Bratvold, D., Browdy, C. L., Sandifer, P. 2003 Physical, chemical and biological characteristics of distinctive regios in paddlewheel aerated shrimp ponds. Aquaculture, 217: 235
í 248.
Lahav, O., Ritvo, G., Slijper, I., Hearne, G., Cochva, M. 2004 The potential of using ironoxide-rich soils for minimizing the detrimental effects of H2 S in freshwater aquaculture systems.Aquaculture, 238: 263 í 281.
Lemonier, H., Bernard, E., Boglio, E., Goarant, C., Cochard, J. C. 2004 Influence of sediment characteristics on shrimp physiology: pH as principal effect. Aquaculture, 240: 297 í 312.
Meijer, L. E., Avnimelech, Y. 1999 On the use of micro-electrode in fish pond sediments.Aquacultural Engineering, 21: 71 í 83.
Peterson, E.L. 1999 Benthic shear stress and sediment condition. Aquacultural Engineering, 21,:85 í 111.
Ritvo, G., Samocha, T. M., Lawrence, A. L., Neill, W. H. 1998 Growth of Penaeus vannamei on soils from various farms, under laboratory conditions. Aquaculture, 163: 101 í 110.
Ritvo, G., Shitumbanuma, V., Dixon,J. B. 2004 Soil solution sulfide control by two iron-oxide minerals in a submerged microcosm. Aquaculture, 239: 217 í 235.
Seo, J., Boyd, C. E. 2001 Effects of bottom soil management practices on water quality improvement in channel catfish Ictalurus punctatus ponds. Aquacultural Engineering, 25: 83 í 97.
Steeby, J. A., Hargreaves, J. A., Tucker, C.S.,Kingsbury, S. 2004 Accumulation, organic carbon and dry matter concentration of sediment in commercial channel catfish ponds. Aquacultural Engineering, 30: 115 í 126.
Suplee, M. W., Cotner, J. B. 1996 Temporal changes in oxygen demand and bacterial sulfate reduction in inland shrimp ponds. Aquaculture,145: 141 í 158.
Vinatea, L. A. 2004 Princípios químicos de qualidade da água em aqüicultura. 2 ed. Editora da Universidade Federal de Santa Catarina :Florianópolis.
