IJMS -2016v6n42 - page 12

International Journal of Marine Science 2016, Vol.6, No.42, 1-8
5
Table 2 Length–length relationship comparisons of total length (TL), fork length (FL) and standard length (SL) for
.
I, isometric; PA, positive allometry; R2, coefficient of determination
N
Y=a Xb
R2
Relationship
Male
73
TL=1.44FL0.96
0.99
PA
73
TL=1.70SL0.95
0.99
PA
73
FL=0.7 TL1.03
0.99
I
73
SL=0.58TL1.04
0.99
I
73
SL=0.84FL1.00
0.99
I
Female
105
TL=1.38FL0.97
0.99
PA
105
TL=1.68SL0.95
0.99
PA
105
FL=0.73TL1.02
0.99
I
105
SL=0.59TL1.04
0.99
I
105
SL=0.82FL1.01
0.99
I
Sexes combined
104
TL=1.27FL0.98
0.92
PA
104
TL=1.47SL0.97
0.93
PA
104
FL=1.21TL0.94
0.92
PA
104
SL=0.98TL0.95
0.93
PA
104
SL=0.91FL0.99
0.96
PA
Undifferentiated sexes
282
TL=1.14FL1.00
0.99
I
282
TL=1.36SL0.99
0.99
PA
282
FL=0.91TL0.99
0.99
PA
282
SL=0.75TL1.00
0.99
I
282
SL=0.84FL1.01
0.99
I
The growth of the eight morphometric characters are relative to the total length of male
S. Dumerili
shown
isometric growth in the case of BDD1/TL, LPD2/TL, PD1/TL and PD2/TL. The remaining morphometric
characters were shown to have positive allometry growth. For female, PD1/TL and PD2/TL were shown to have
isometric growth and the remaining morphometric characters were shown to have positive allometry.
During the present studies, seven meristic characters have been counted. These characters have definite number
and count, sometimes they variate and falls under some specific range. The specimens of
S. dumerili
collected
from Gulf of Gabes, Tunisia have the following set of meristic characters: D1 VI-VII, D2 I/29-35, A III 18-21, P
19-20, V I 5, LGR 13-21 and LL 140-180.
The relationship between total, standard and fork lengths are given in Table 2 for
S. dumerili
. The values for
coefficient of determination (R
2
) for all the length-length parameters of male, female, combined sexes and
undifferentiated sexes were > 0.9.
3 Discussion
The results of the present study revealed that the variation between the means of all 8 morphometric characters
studied of
S. dumerili
were found to be not significant (t-test; p>0.05) between male and female. Thus, it is not
possible to observe phenotypic variation between the two sexes. Specific research works were performed regarding
morphometric characteristics of male and female of different species of fish such as, Lashari et al. (2004),
Narejo et al. (2000), Narejo (2010) and Dars et al. (2012) and their results found to be in agreement with our results.
To accept the statement that morphometric can distinguish between different species of fish given by Minos et al.
(1995), Cavalcanti et al. (1999), Sabadin et al. (2010), Díazde—Astrloa et al. (2011) and Zhan and Wagn (2012),
morphometric data of another
Seriola
species need to be available for comparison.
In case of the male of
S. dumerili
the growth of LPD2, PD1 and PD2 were shown to have isometric growth. The
decimal value of the coefficient b was very small and considered 1. On the other hand, the female showed isometric
growth for the characters PD1 and PD2. The growth of the remaining morphometric characters of both male and
1...,2,3,4,5,6,7,8,9,10,11 13,14,15,16
Powered by FlippingBook