Lampriformes: Trachipteridae: H I A2

Zu cristatus (Bonelli, 1820)

Scalloped ribbonfish

Egg diameter in m

Number of oil globules

Diameter of oil globule in m

Yolk texture

Perivitelline space

Position of oil globule at hatch

Gut length at eye- pigment stage








53% of NL

Ca 80

Egg: This egg has only been seen on four occasions in 25 years. The newly collected egg is illustrated in Plate A (arrowed, alongside a further advanced, spiky egg of CHIA1). No pigment was noted on the tiny embryo within the egg, but there were scattered black pigment spots on the yolk surface 4 days later, more dense near the embryo (A1). Incubation is at least 10 days (23C).

Larva description: The newly hatched larva has unpigmented eyes, with long dorsal and pelvic fin elements (B). Myomere split was 24 + 56. A1: 4 days PC, B: NH, D 13 days PC, 2 days post hatch (23C).

The most recent egg, collected in July 2008, had a lower myomere count of 65 (see box data above), and the hatched larva (Plate D) has been barcoded, matching Zu cristatus from New Zealand (DSLAR565-09 in BOLD). This suggests there might be at least two species in this egg catagory, and that the larva in Plate B is not Zu. Two of the 4 eggs were collected in November, 1 in February and 1 in July.