Stromateidae: F II A3

Hyperoglyphe antarctica (Carmichael, 1818)

Antarctic butterfish

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

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 (21C).

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 (21C), 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 (21C).

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