International Journal of Marine Science 2016, Vol.6, No.37, 1-5
3
dimensions according to Valentine et al. (1973):
CV
2
a
= (S r-l X 100/X r + l)
2
Where S r-l is the standard deviation of signed differences and X r + l is the mean of the character, which is
calculated by adding the absolute scores for both sides and dividing by the sample size.
Table 1 Squared coefficient of asymmetry (CV
2
a
) value and character means (X
r+1
) of
Chlorurus sordidus
and
Hipposcarus harid
2 Results
The results of asymmetry data analysis of the otolith length, width of
C. sordidus
and
H. harid
collected from
Hurghada, Red Sea coast of Egypt are shown in Table 1. The results showed that the level of asymmetry of the
otolith length was higher than that of the otolith width. For
C. sordidus
and for both otolith variables, the lowest
and highest values are found in the fish total length groups 150-170 mm and 240-260 mm. The asymmetry
coefficient has zero value for other length groups. In both species, the results showed that asymmetry was
correlated with fish length (Table 2).
Table 2 Squared coefficient of asymmetry and character means by size of
Chlorurus sordidus
and
Hipposcarus harid
The percentage of the individuals showing asymmetry in the otolith length character was the highest among the
percentages obtained for the two otolith characters in both species (Table 1).
3 Discussion
Abnormal swimming and behaviour in some fish individuals resulted in interference with the sound localization
Character
CV
2
a
N
Character mean
% of individuals with asymmetry
Chlorurus sordidus
Otolith length
14.049
30
5.214
6.6
Otolith width
10.436
30
3.377
6.6
Hipposcarus harid
Otolith length
15.190
30
6.109
16.7
Otolith width
11.962
30
4.048
3.3
Character
CV
2
a
N
Character mean
% of individuals with asymmetry
Chlorurus sordidus
Otolith length
150-170
0.032
7
5.60
0
180-200
0
5
5.67
3.33
210-230
0.040
16
6.11
3.33
240-260
0.093
2
6.60
0
Otolith width
150-170
0
7
3.78
0
180-200
0
5
3.66
3.33
210-230
0
16
4.00
3.33
240-260
0.058
2
3.94
0
Hipposcarus harid
Otolith length
160-170
0.504
2
5.91
0
180-200
0.913
5
5.82
20
210-230
0
16
6.20
6.25
240-260
0.967
2
6.6
0
Otolith width
150-170
0
2
3.76
0
180-200
0
5
3.84
20
210-230
0
16
4.20
6.25
240-260
1.639
2
3.94
0
