Head angles and lower jaw depression of Chelus fimbriatus for three prey positions
| . | Head angle (degrees) . | . | . | . | ||
|---|---|---|---|---|---|---|
| Fish position . | Before gape . | During maximum gape . | At end of forward thrust . | Lower jaw depression with respect to the background (cm) . | ||
| On substratum | 2.4±1.7 | 2.35±1.14 | 2.35±1.16 | 1.59±0.19 | ||
| In front of head | 23.9±3.39 | 33.3±2.58 | 2.25±1.59 | 0.87±0.21 | ||
| Above head | 44.3±2.75 | 33.95±2.35 | 2.3±1.59 | 0.5±0.14 | ||
| . | Head angle (degrees) . | . | . | . | ||
|---|---|---|---|---|---|---|
| Fish position . | Before gape . | During maximum gape . | At end of forward thrust . | Lower jaw depression with respect to the background (cm) . | ||
| On substratum | 2.4±1.7 | 2.35±1.14 | 2.35±1.16 | 1.59±0.19 | ||
| In front of head | 23.9±3.39 | 33.3±2.58 | 2.25±1.59 | 0.87±0.21 | ||
| Above head | 44.3±2.75 | 33.95±2.35 | 2.3±1.59 | 0.5±0.14 | ||
Values are means ± S.D. (N=20).
Head angles were measured during three different stages of the forward thrust.