Table 1.
Egg and embryonic development Hyphessobrycon eques reared at a mean temperature of 28 °C

Stage	Elapsed time	Characters	Fig. 2.
Zygote period
Fertilization	0 hr 00 min
Cell cleave period
32 cell	2 hr 00 min	4 8 array of blastomeres	A
64 cell	2 hr 30 min	8 8 array of blastomeres	B
Blastula period
Morula	3 hr 00 min	The number of blastomeres were increased and this size became smaller, blastomeres were overlapped.	C
Blastula	3 hr 30 min	Marginal cell was expanded slopingly to vegetal pole.	D
Gastrula period
Gastrulation	4 hr 00 min	Blastula came down and cover the yolk.	E
Embryoric period
	5 hr 00 min	Blastopore closure	F
	6 hr 30 min	Head development
	7 hr 00 min	Formation of optic vesicles and Kupffer's vesicles	G
	8 hr 30 min	13 17 myotomes, formation of auditory vesicles, disappear Kupffer's vesicles	H
	11 hr 00 min	20 25 myotomes, tale seperated	I
	11 hr 30 min	26 28 myotomes, Formation of primordial finfold	J
Beginning of heart beating	13 hr 30 min	30 32 myotomes, Heartbeat has begin, tale become sharpen and longer	K
	14 hr 30 min	35 38 myotomes, Motion observed, Blood flow observed	L
	15 hr 00 min	70 75 myotomes	M
Hatching	16 hr 00 min	Haching is beginning; Head headonapical part of egg membrane	N