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- Title
Water quality in a serial-use raceway and its effect on the growth of South African abalone, Haliotis midae Linnaeus, 1758.
- Authors
Naylor, Matthew A.; Kaiser, Horst; Jones, Clifford L. W.
- Abstract
To quantify the effects of serial-use of water on abalone growth and feed conversion, this study describes water quality in a serial-use raceway with seven passes. A flow index of 7.2-9.0 L h kg was estimated as the minimum value at which to grow 60-70 mm Haliotis midae, as weight gain (analysis of variance; F=13.9, P<0.0001) and feed conversion ratio (Kruskal-Wallis test; H=16.3, P=0.012) were significantly reduced at lower values. pH and dissolved oxygen concentration were positively correlated with the flow index (pH, r=0.99; P<0.001; dissolved oxygen, r=0.99; P<0.001), while free ammonia nitrogen (FAN) and nitrite were negatively correlated with the flow index (FAN, r=0.99, P<0.001; Nitrite, r=0.93, P<0.001). The concentration of nitrite increased throughout the experiment and may reflect the colonization of Nitrosomonas bacteria as water re-use increased. Based on comparisons with growth and toxicity tests, it is suggested that low pH combined with growth-limiting levels of FAN were the first variables limiting abalone growth in the serial-use raceway.
- Subjects
HALIOTIS midae; ABALONES; EFFECT of water quality on fishes; EFFECT of water levels on fishes; HYDROGEN-ion concentration; NITROSOMONAS
- Publication
Aquaculture Research, 2011, Vol 42, Issue 7, p918
- ISSN
1355-557X
- Publication type
Article
- DOI
10.1111/j.1365-2109.2010.02660.x