International Journal of Marine Science 2016, Vol.6, No.44, 1-8
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Morphometry
The morphometric measurements such as TL, FL, weight and the mean, SD value and morphometric relationship
are given in table 1 for both male and female. In the case of male the TL ranged between 21.5 cm and 67.1 cm.
The fork length was between 16.1 and 63.5 cm and the weight was in between 150 and 1750 gm. The linear
relationship between TL and FL was worked out to be FL = -1.49 + 0.88 TL(r = 0.98). In the case of female the
TL ranged between 26 and 63.1 cm and fork length 21-59 cm. The weight observed was between 200 and 2150
gm. The linear relationship between TL and FL was observed to be FL = 1.16 + 0.82 TL(r = 0. 99).
Sex ratio
A total of 1849 specimens consisting of 725 males and 1124 females were taken for sex ratio analysis. During the
period of study the male to female ratio was found to be 1:1.6(table 2). All the length groups from 15.1 to 66 were
represented by male however only 14 length groups i.e from 21.1-24.0 to 60.1-63.0 were represented by female.
Among the males it was noticed that the length group 39.1-42.0 cm contributed maximum followed by 36.1-39.0.
In the case of female also similar result was obtained. The length group 39.1-42 contributed maximum to the
population followed by 36.1-39.0. In the overall sex distribution in different length groups, one interesting pattern
could be noticed. Up to 33 cm fork length (i.e immature specimens) the males were more than females. From 33.1
cm onwards and up to 45 cm (i.e maturing specimens) female population was exactly one and half of the male
population in all the length groups. However 48 to 54 cm (i.e matured specimens) the female population
completely outnumbered the male population and the rate of enhance of female than male decreased gradually up
to 63 cm.
Length frequency study
The male specimens were recorded from 16.1 cm to 63.5 cm fork length and the percentage of male was more at
39.1-42.0 cm and 36.1-39.0 cm respectively, whereas the female specimens were recorded from 21 – 61.5 cm fork
length and the dominance was at 39.1-42.0 cm and 36.1-39 cm respectively (fig.2).
Fig.2. Length frequency of
S.guttatus
in north east coast of India
Length - weight relationship
The length – weight relationship for both sexes of
Scomberomorus guttatus
was analyzed and presented. The
equations derived are
Female: Log W= -1.1285 + 2.4644 Log L (r= 0.92)…………………………… (1)
Male: Log W= - 0.8331+2.2683 Log L (r = 0.91)…………………………… (2)
The ‘r’ value for both the sexes showed high degree of correlation.
