Figures & data
Figure 1 Callorhinchus milii egg case with outer pigmented egg case layer peeled back to expose the transparent inner layer still protecting the developing embryo and egg yolk.
Table 1 Details of Callorhinchus milii egg case collection and rearing conditions.
Figure 2 Map of New Zealand showing South Island study sites.
Table 2 Callorhinchus milii embryonic development times.
Figure 3 Predicted spawning dates for Callorhinchus milii in the Marlborough Sounds (Pelorus Sound and Queen Charlotte Sounds) for 2004. The peak spawning events appear to follow a roughly fortnightly cycle.
Figure 4 Predicted Callorhinchus milii embryonic development at differing spawning times for all four spawning sites. Marlborough Sounds embryos spawned in March, April and May hatch in late September (30 weeks), mid-November (32 weeks), and mid-December (33 weeks) respectively. Canterbury Bight embryos spawned in November, December and January hatch in late April (26 weeks), late May (25 weeks), and late July (29 weeks) respectively. Dunedin embryos spawned in November, December and March hatch in mid-June (32 weeks), late July (34 weeks), and mid-December (41 weeks) respectively. Te Waewae Bay embryos spawned in December, January and March hatch in late June (29 weeks), late August (34 weeks), and late November (38 weeks) respectively.
Figure 5 Monthly mean water temperatures at Callorhinchus milii spawning sites around New Zealand. Standard error bars are on Marlborough Sounds and Dunedin temperatures; there are no error bars for Canterbury Bight or Te Waewae Bay satellite sea surface temperature data.
Figure 6 Observed (‘x’) and predicted (lines) development times as functions of embryonic stage and water temperature. The predicted times are for integer temperatures between 9°C and 20°C.
