The embryonic and larval development of black skirt tetra, Gymnocorymbus ternetzi, are described under controlled laboratory conditions. In addition, major histomorphological changes and the allometric growth patterns during larval development have been described. The laboratory-reared broodstock, that is 1 similar to year of age, were spawned. Hatching occurred 2021 similar to h after spawning at 24 +/- 0.5 degrees C. The cleavage was finished in 2 similar to h and the early blastula stage occurred at 2:04 hours after spawning. The gastrulation started at 3:20 similar to hours and 30% epiboly was observed at 3:34 similar to hours after spawning. Eight-somite stage was observed at 08:33 hours. And embryonic developmental stage was completed at 21 similar to h after spawning. The newly hatched larvae were 1442 +/- 14.3 similar to mu m in mean total length (TL). The mouth opened at 3 days after hatching (DAH). The yolk sac had been totally absorbed and the larvae started to swim actively within 34 similar to days. Notochord flexion began at 11 DAH. The metamorphosis was completed and the larvae transformed into juveniles at 32 DAH. In this paper, the full developmental sequence from egg to juvenile of G. ternetzi is described for the first time.
The embryonic and larval development of black
skirt tetra, Gymnocorymbus ternetzi, are described
under controlled laboratory conditions. In addition,
major histomorphological changes and the allometric
growth patterns during larval development have
been described. The laboratory-reared broodstock,
that is 1 year of age, were spawned. Hatching
occurred 20–21 h after spawning at 24 ± 0.5°C.
The cleavage was finished in 2 h and the early blastula
stage occurred at 2:04 hours after spawning.
The gastrulation started at 3:20 hours and 30%
epiboly was observed at 3:34 hours after spawning.
Eight-somite stage was observed at 08:33 hours.
And embryonic developmental stage was completed
at 21 h after spawning. The newly hatched larvae
were 1442 ± 14.3 lm in mean total length (TL).
The mouth opened at 3 days after hatching (DAH).
The yolk sac had been totally absorbed and the
larvae started to swim actively within 3–4 days.
Notochord flexion began at 11 DAH. The metamorphosis
was completed and the larvae transformed
into juveniles at 32 DAH. In this paper, the full
developmental sequence from egg to juvenile of
G. ternetzi is described for the first time.
