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Table 1
Morphological development of the Aquitanian pike during the first 11 weeks post-hatching when reared at 12 °C (n = 15 larvae; reared individually in a petri dish), see Figure 5.
| Week | Mean total length (mm) | Description |
| T0 | 9.09 | Curved body (inclined head) resting on a voluminous, ovoid yolk sac, only pectoral fins differentiated from the protopterygia; diphycercal caudal: symmetrical protopterygia in relation to the terminal part of the notochord, pigmentation localized on dorsal surface and lateral line Mouth still closed |
| T1 | 11.76 | Mouth open, in terminal position Resorption of the yolk sac Development of the snout Yolk sac reabsorbed, but lipids (energy reserves) still present |
| T2 | 13.59 | Propterygia starts to atrophy at the ventral and dorsal surfaces (between anus and tip of notochord) Development of pelvic fin |
| T3 | 13.54 | All energy reserves consumed: end of the endogenous feeding period |
| T4 | 14.65 | Snout is formed, but its length is less than the eye diameter |
| T5 | 16.72 | Development of dorsal, anal and caudal fin rays (lower lobe) |
| T6 | 17.71 | Beginning of pigmentation at the base of dorsal, anal and caudal fin rays |
| T7 | 18.97 | Heterocercal caudal fin Upper caudal fin lobe: acute (notochord) Lower caudal fin lobe: rounded (rays) |
| T8 | 20.04 | The caudal fin has a three-lobed shape as a result of the progressive regression of the protopterygia. Upper lobe: begins to merge with upper rays Lower lobe: begins to separate into 2 parts |
| T9 | 20.93 | Snout length greater than eye diameter |
| T10 | 25.20 | Caudal fin separated from dorsal and anal fins (atrophied proto pterygia) |
| T11 | 27.85 | Homocercal caudal fin: upper lobe (raised notochord + rays) and lower lobe (rays) Anal and dorsal fins shaped and individualized Pectoral and pelvic fins formed |
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