Through direct manipulation of yolk sac volume (Vy), in the zebrafish Danio rerio, Vy and offspring size was positively correlated and the relationship was independent of geographical location, parental size or age and, most importantly, parental genetic factors. Larval survivorship, under a non‐feeding regime and up until hatch, was not significantly affected by the manipulation. Decreased Vy significantly decreased maximum standard length (LS), maximum body surface area (AB), time to yolk sac absorption, LS and AB at yolk sac absorption, and the LS and AB at starvation. The methodology of Vy adjustment will be useful for the studies of the interaction between early life‐history traits and offspring size, egg quality variables and early vertebrate development.

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High inspired oxygen fraction during anesthesia is associated with CSF hyperintensity in the basilar cisterns and the cerebral sulcal subarachnoid space on FLAIR imaging in children and young adults. Physicians should be aware of this finding to avoid misinterpreting this artifact as an abnormality.

These findings are consistent with the hypothesis that increased arterial oxygen tension and consequently increased CSF Po(2) resulting from administration of high Fio(2) during general anesthesia are responsible for the increased CSF signal intensity noted on brain FLAIR MR images.

No abstract