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Table 1.

Morphometric measurements used to determine different age classes of California sea lions

Age classNMass (kg)Standard length (cm)Curvilinear length (cm)Anterior foreflipper (cm)Canine* (mm)Incisor* (mm)
5-month pups 11 20.9±1.4 100.2±1.4 105.2±1.4 31.0±0.6 NA NA 
9-month pups 23.2±1.2 100.4±1.7 105.4±1.7 29.6±0.7 3.7±0.5 6.5±0.3 
Small juvenile 16 39.1±1.6 126.4±2.5 129.0±3.2 37.3±0.7 8.3±0.7 8.6±0.4 
Large juvenile 12 70.1±2.7 156.4±2.0 163.9±2.6 47.4±0.8 NA NA 
Sub-adult male 16 125.4±3.8 187.5±2.0 197.1±1.9 54.8±0.5 NA NA 
Adult female 37 86.7±2.1 165.4±2.0 173.2±2.2 48.2±0.7 NA NA 
Adult male 31 175.0±7.8 205.6±2.3 216.2±2.3 58.8±0.6 NA NA 
Age classNMass (kg)Standard length (cm)Curvilinear length (cm)Anterior foreflipper (cm)Canine* (mm)Incisor* (mm)
5-month pups 11 20.9±1.4 100.2±1.4 105.2±1.4 31.0±0.6 NA NA 
9-month pups 23.2±1.2 100.4±1.7 105.4±1.7 29.6±0.7 3.7±0.5 6.5±0.3 
Small juvenile 16 39.1±1.6 126.4±2.5 129.0±3.2 37.3±0.7 8.3±0.7 8.6±0.4 
Large juvenile 12 70.1±2.7 156.4±2.0 163.9±2.6 47.4±0.8 NA NA 
Sub-adult male 16 125.4±3.8 187.5±2.0 197.1±1.9 54.8±0.5 NA NA 
Adult female 37 86.7±2.1 165.4±2.0 173.2±2.2 48.2±0.7 NA NA 
Adult male 31 175.0±7.8 205.6±2.3 216.2±2.3 58.8±0.6 NA NA 

Values are means ± s.e.m.; NA, not available

*

Data from 9 month old pups (N=5) and small juveniles(N=9) captured on San Nicolas Island in March 2005

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