Asymmetry in Some Morphological Characters of Indian Oil Sardine, Sardinella Longiceps Valenciennes,1847 Collected from Muscat Waters on the Sea of Oman - page 02

 

Results

The results of asymmetry data analysis of the previously listed characters of Sardinella longiceps collected from the Muscat coastal area, in the mid-region of the Sea of Oman are shown in Table 1. The highest value was recorded for the number of pectoral fin ray and the lowest value for the postorbital length.

The percentage of the individuals showing asymmetry in the postorbital length character was the highest among the percentages recorded for the five characters (95.7% of the total fish studied) and the lowest percentage was for the individuals with asymmetry in eye diameter (71.6% of the total fish studied). Individuals of S. longiceps were grouped into length classes (Table 2). An increasing trend in the asymmetry value with fish length is obtained for preorbital and postorbital lengths.

 

Table 1: Squared coefficient asymmetry (CV2a) values and character means (Xx+1) of Sardinella longiceps

Charcter

CV2a

N

Character mean

% of individuals with asymmetry

Preorbital length

123.2

71

16.2

95.7

Postorbital length

55.0

71

23.1

97.2

Eye diameter

125.3

67

1.7

71.6

Number of Pectoral Fin ray

178.7

70 12.3

87.1

Head length

98.4

71

46.1

92.9