Lutjanidae: K III A9
Paracaesio xanthura (Bleeker, 1869) and Caesio caerulaurea Lacepede, 1801
Yellowtail false fusilier; blue-and-gold fusilier
|
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 |
|
840-910 |
1 |
145-190 |
clear |
*narrow |
bow |
42% of NL |
24-25 |
Egg: Black dots appear on the embryo, in 2 rows dorsally. On the oil globule, they are ventral, and usually densely packed, making the oil globule appear black on a white background (A1). The embryo has a pale yellow/amber hue on a white background. Incubation is up 35-40 hours. *The PVS can be wider than usual in some batches of eggs. These eggs often sink when about to hatch.
Larva: This larva was separated from the previous one (KIIIA8), by the absence of a line of black on the anal tube (B). At 4 days, the larva develops a dark line of pigment over the gut (D). C: 1 day, D: 2 days, E: 4 days (24°C).
Many attempts to rear this important egg, were unsuccessful. Sixteen larval DNA barcode sequences are currently available. Seven match 3 adult Paracaesio xanthura collected locally, while 4 match 2 Caesio sp. posted by SAIAB (T652 and T727, BOLD reference), and 9 have matched 5 locally collected Caesio caerulaurea. This latter identification is however, tentative, since 9 locally collected adult C. caerulaurea have barcoded as possibly two very closely related species that require further study. More larval and adult sequences will establish how much of this page should be combined with KIIIA8, and assist to separate out the Caesio mentioned above.
This was the 7th most common egg off Park Rynie. It showed a definite summer maximum, but was present throughout the year (blue graph). It was only seen once in the DHM samples, in June. At Park Rynie, the egg has shown an increasing presence, after being virtually absent in the first three years (white graph). In the Park Rynie linked samples, the eggs were dominant offshore (93%), indicating spawning slightly further offshore than the geelbek (LIIA6). See Section 7.3 and Table 1 of the Introductory Notes, for more information on the linked samples.
|
Linked samples |
Offshore |
Inshore |
|
Eggs |
24851 |
1752 |
|
Hits |
98 |
95 |