On Australian aquaculture farms, early life stages of abalone are reared under controlled abiotic and biotic conditions in an attempt to optimize individual growth and reduce potential stressors. Yet, physiological responses to the rearing conditions are largely unknown. This study tests if commercial stocking densities, light conditions, and oxygen levels influence the oxygen consumption rate (ṀO2) of early life stages of Haliotis rubra and Haliotis laevigata hybrids at a standard commercial hatchery temperature of 16°C. Oxygen consumption rate of fertilized eggs and larvae in the trochophore, mid-veliger, and early benthic veliger stages were measured at densities from 100 to 2,400 individuals/ml, in light and dark conditions and oxygen levels of 100%–0% air saturation (%O2sat). Neither density nor light conditions affected ṀO2 of any of the tested life stages. Normoxic ṀO2 varied across developmental stage and was higher in the actively swimming mid-veliger stages (114.92 ± 2.68 pmol O2/ind/h) in comparison with less active earlier (49.48 ± 2.33 pmol O2/ind/h) and later life stages (65.90 ± 3.05 pmol O2/ind/h). Critical oxygen tensions, taken as the point at which animals could no longer maintain ṀO2, ranged from 22.7%± 2.7%O2sat in fertilized eggs to 14.0% ± 1.0% O2sat in mid-veliger larvae. These results suggest that current conditions in Australian abalone aquaculture farms should not negatively impact the development of early life stages of hybrid abalones.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither BioOne nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the BioOne website.
Vol. 35 • No. 3