Stromateidae: F II A3
Hyperoglyphe antarctica (Carmichael, 1818)
Antarctic butterfish
Egg diameter in µm |
Number of oil globules |
Diameter of oil globule in µm |
Yolk texture |
Perivitelline space |
Position of oil globule at hatch |
Gut length at eye- pigment stage |
Myomeres |
1250-1345 |
1 |
360-410 |
segmented |
narrow |
stern |
55% of NL |
28-30 |
Egg: This egg (A) always needs to be hatched to confirm identification. At a stage, black pigment forms two lines on the embryo, and speckles the yolk and oil globule, making the latter look dark brown (B). Incubation can be as long as 86-94 hours (21°C).
Larva: The newly hatched larva has unpigmented eyes and an unformed mouth. Pigmentation includes a patchy white edge to the notochord dorsally, matched ventrally only near the tip (C). The white pigment persists to day 4, and the black pigment intensifies to a dense band along the notochord (G, G1 & G2). A larva was reared to 30 days (21°C), at which stage flexion appears to have just been completed (H). C & D: NH, E: 1 day, F: 2 days, G: 4 days, H: 30 days (21°C).
This species can be confused with FIIA5, which has less black pigment and more yellow pigment in the 1-4 day larva. The identification of this species is based on DNA barcoding, although the myomere count appears a little high for this species, listed as having 24-25 vertebrae by Horn (1984). Five hatched larvae have been sequenced, and a match was found with adult material in BOLD, collected off Australia.
The limited data indicate that this species spawns in winter (blue graph). The Park Rynie linked samples had 89% offshore, as would be expected of an offshore species that is trawled in 300m deep water (Haedrich, 1986). See Section 7.3 and Table 1 of the Introductory Notes, for more information on the linked samples.
linked samples |
Offshore |
Inshore |
Eggs |
16 |
2 |
Hits |
8 |
2 |