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Fig. 1 Shell length, age and ventilatory behaviour in Lymnaea. (A) The
growth of snails (as measured by shell length) was linear between 3.5–13
weeks of age (post-hatching). Snails were maintained in standard conditions
and a cohort (N=33) of randomly selected snails from the over 200
snails in the aquarium were measured weekly. The snails displayed continuous
shell growth at a rate of 0.25 mm day–1. Based on this growth
curve adults (2.5 cm) and juveniles (1.5 cm) are approximately 13 and 8 weeks
old, respectively. (B) Increased aerial respiration in hypoxia. Both adult
(N=43 each) and juvenile snails significantly (P<0.01 in
both cases) increase their total breathing time when exposed to the hypoxic
environment. However in both eumoxia and hypoxia the total breathing time in
adults was significantly greater (P<0.001) than in juveniles.
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