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Table 2.

Morphological measurements of specimens, swimbladders and ossicles

SpeciesNSBOMean SL (mm)Mean TL (mm)Mean SBL (mm)rSBLrCL
A. seemanni Free 64.48±4.32 78.38±6.24 7.84±1.45 0.120 0.034 
B. raninus Free 55.04±2.64 69.15±3.28 7.96±0.41 0.145 0.033 
M. beninensis Free 104.62±14.96 123.27±17.38 8.86±1.45 0.084 0.050 
Pimelodella sp. Free 89.57±8.98 104.10±9.8 10.43±0.89 0.117 0.044 
S. schoutedeni Free 87.31±9.99 113.20±9.14 13.19±1.47 0.152 0.053 
T. taeniatus Free 132.80±5.84 146.40±7.00 14.39±0.54 0.109 0.035 
A. ranunculus Enc. 81.98±3.97 97.82±4.88 4.68±0.36 0.057 0.016 
C. sodalis Enc. 50.77±0.70 64.73±1.20 1.92±0.16 0.038 0.019 
D. urostriatum Enc. 73.17±0.83 92.07±1.71 3.15±0.14 0.043 0.011 
H. acipenserinus Enc. 68.10±1.65 74.46±2.08 1.09±0.03 0.016 0.011 
H. thoracatum Enc. 48.33±1.79 60.03±2.30 1.46±0.10 0.030 0.013 
SpeciesNSBOMean SL (mm)Mean TL (mm)Mean SBL (mm)rSBLrCL
A. seemanni Free 64.48±4.32 78.38±6.24 7.84±1.45 0.120 0.034 
B. raninus Free 55.04±2.64 69.15±3.28 7.96±0.41 0.145 0.033 
M. beninensis Free 104.62±14.96 123.27±17.38 8.86±1.45 0.084 0.050 
Pimelodella sp. Free 89.57±8.98 104.10±9.8 10.43±0.89 0.117 0.044 
S. schoutedeni Free 87.31±9.99 113.20±9.14 13.19±1.47 0.152 0.053 
T. taeniatus Free 132.80±5.84 146.40±7.00 14.39±0.54 0.109 0.035 
A. ranunculus Enc. 81.98±3.97 97.82±4.88 4.68±0.36 0.057 0.016 
C. sodalis Enc. 50.77±0.70 64.73±1.20 1.92±0.16 0.038 0.019 
D. urostriatum Enc. 73.17±0.83 92.07±1.71 3.15±0.14 0.043 0.011 
H. acipenserinus Enc. 68.10±1.65 74.46±2.08 1.09±0.03 0.016 0.011 
H. thoracatum Enc. 48.33±1.79 60.03±2.30 1.46±0.10 0.030 0.013 

Mean SL, TL and SBL values are given ± s.e.m. Enc., encapsulated swimbladder; Free, non-encapsulated swimbladder; N, number of specimens examined; O, number of ossicles in chain; rCL,relative length of chain of ossicles; rSBL, relative swimbladder length; SB,swimbladder; SBL, maximum swimbladder length; SL, standard length; TL, total length

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