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The effects of elevated concentrations of dissolved inorganic phosphate in seawater on the growth and survival of juvenile abalone, Haliotis iris
Author(s) -
James Philip J,
Barr Neill G
Publication year - 2012
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2011.02847.x
Subject(s) - abalone , biology , juvenile , seawater , zoology , haliotis discus , phosphate , haliotis , fishery , ecology , biochemistry
eawater sampling from three abalone farms in New Zealand showed average ambient concentrations of dissolved inorganic phosphate (P i ) varying between 2.36 and 238 μM. The P i concentration within each system appeared to be directly linked to the percentage of water that was replaced each day. An experiment was conducted over 5 months to examine the effect of elevated P i concentrations on the growth of two juvenile abalone ( Haliotis iris ) size classes (small: average shell length=23.9 ± 0.1 and large: average shell length=61.9 ± 0.1 mm). Abalone from each size class were exposed to P i concentrations of; (a) natural incoming seawater (average 0.12 ± 0.12 μM), (b) 10.7 ± 1.3 μM, (c) 60.9 ± 5.8 μM and (d) 113.1 ± 5.6 μM. The results suggest that over the course of the 5‐month period of this experiment there was a significant negative impact on growth (shell length and wet weight) when the smaller size class of abalone were exposed to P i concentrations greater than 10.7 μM and for the large size class of abalone when exposed to greater than 60.9 μM P i . However, elevated P i concentrations did not significantly impact on abalone survival during the course of the experiment.