International Journal of Aquaculture, 2013, Vol.3, No.12, 55
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62
http://ija.sophiapublisher.com
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Table 1 Embryonic development and accumulative temperature of
Thamnaconus modestus
Development hours
Development stages
Accumulated temperature (
℃
×h) Figure
Prey
-
cleavage stage
0
h
Fertilization
0
3
-
1
Cleavage stage
1
h 30 min
2
-
cell
31.50
3
-
2
1
h 55 min
4
-
cell
39.90
3
-
3
2
h 20min
8
-
cell
48.93
3
-
4
2
h 50 min
16
-
cell
59.43
3
-
5
3
h 25 min
32
-
cell
71.40
3
-
6
Blastula stage
6
h 20 min
High blastula
132.93
3
-
7
7
h 20 min
Low blastula
153.93
3
-
8
Gastrula stage
10
h
Early gastrula
210.00
3
-
9
15
h 30 min
Late gastrula
321.30
3
-
10
Neurula stage
16
h
Neural stage
336.00
3
-
11
17
h
Closure stage of blastopore
357.00
3
-
12
Organic forming stage
17
h 40 min
Formation of optic vesicle
371.07
3
-
13
22
h 35 min
Formation of eye lens
474.60
3
-
14
Tail-bud stage
25
h 30 min
Tail-bud stage
531.30
3
-
15
Muscular contraction stage 31 h
Formation of optic capsule
651.00
3
-
16
40
h
Muscular contraction
840.00
3
-
17
44
h
Heart pulsation
924.00
3
-
18
Hatching stage
48
h
Pre-hatch embryo
1000.00
3
-
19
50
h
50%
hatched
1050.00
3
-
20
Figure 2 Embryonic development of
T. modestus.
Stages and development information refer to Table 1