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Table 1.

Mean (±s.d.) relative mass of each extraocular muscle (muscle mass as percentage of total eye mass) in the opah, Lampris guttatus(N=7) and the chub mackerel, Scomber japonicus(N=5)

Extraocular muscleLampris guttatus (%)Scomber japonicus (%)
Lateral rectus 11.70±1.04 4.81±0.83 
Superior rectus 4.33±0.58 1.64±0.49 
Inferior rectus 4.27±0.66 1.51±0.55 
Medial rectus 10.27±0.98 2.68±0.68 
Superior oblique 4.56±0.62 1.56±0.22 
Inferior oblique 4.92±0.28 1.70±0.71 
Extraocular muscleLampris guttatus (%)Scomber japonicus (%)
Lateral rectus 11.70±1.04 4.81±0.83 
Superior rectus 4.33±0.58 1.64±0.49 
Inferior rectus 4.27±0.66 1.51±0.55 
Medial rectus 10.27±0.98 2.68±0.68 
Superior oblique 4.56±0.62 1.56±0.22 
Inferior oblique 4.92±0.28 1.70±0.71 

In both species, the lateral rectus muscle is significantly larger than all other extraocular muscles (ANOVA, P<0.05) and the medial rectus is significantly larger than the other four extraocular muscles (ANOVA, P<0.05). The mean relative mass of each extraocular muscle is significantly greater in opah than in chub mackerel (two-sample t-test, P<0.05)

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