International Journal of Marine Science 2016, Vol.6, No.44, 1-8
4
The ANOVA was applied and it revealed that there is no significant difference between the regression coefficients
of females and males. Hence the data for females and males were pooled together and a common length weight
relationship was fitted.
The equation in respect of pooled data is
Log W = -1.1283 + 2.4627 Log L(r = 0.91)………………………………….. (3)
Gonadal stages and maturity studies
A total of six stages were encountered during the study period viz, immature (stage I), maturing (stage II and III),
mature (stage IV), ripe (stage V) and spent (fig. 3). From the figure it could be noticed that the matured and ripe
specimens were observed almost round the year. The peak spawning activity was during December to April. The
juvenile must be recruited to the fishery during January to June.
Fig.3. Maturity stages of
S. guttatus
in north east coast of India
Growth parameters
The electronic length frequency analysis I (ELEFAN I) was used to estimate the asymptotic length (L∞), growth
constant K and t
0
. The observed parameters i.e., L∞, K and t
0
were found to be 64.6, 0.97 and -0.1329 respectively.
The Von Bertalanffy growth equation for the species can be written as follows
Lt = 64.6 [1- e
-0.97(t+0.1329)
]
The Von Bertalanffy growth curve is shown in figure 4.
Fig.4. Growth curve of
S. guttatus
in north east coast of India
