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