Egg concentration (eggs mL-1)

Mean normal larval hatch-out rate (%)

10

94 ± 2.0a

50

96 ± 0.0a

125

87 ± 3.0ab

250

77 ± 6.0b

375

39 ± 7.0c

500

15 ± 2.0d

a, b, c, d Similar superscripts indicate no significant difference (P > 0.05)
Table 1: Hatch-out rates (mean ± SEM) of H. midae larvae relative to egg concentration at fertilisation.