| dc.description.abstract | The research was conducted to determine the breeding season of striped snakehead Channa striatus based
on gonadosomatic index, hepatosomatic index, fecundity, length-weight relationship, body weightfecundity
relationship and gonad weight-fecundity relationship. The objectives were evaluated through
sampling for six consecutive months from April to September, 2014 and samples were collected from local
natural water resources in Sylhet. During study, the range of mean values of length and weight of female
fish were recorded as 31.03±.70 to 36.64±3.04 cm and 264.31±11.74 to 410.03±75.87 g, respectively. The
highest mean GSI was 5.10±0.81 for female and 0.74±0.21 for male also showing the gonadal
development reached its peak in June. Hepatosomatic index implies energy storage for reproduction.
Lower somatic condition during the spawning season gives an indication that the somatic growth is limited
due to the development of gonads. The highest mean HSI was 0.81±0.05 in the month of September and
lowest mean value 0.67±0.17 was recorded in the month of June for female. In case of HSI in male, the
highest mean value was recorded in the month of April 0.84±0.03 and lowest value was shown in the
month of June 0.62±0.01. The GSI value was found to be inversely related with the HSI during the study
period, which indicates transformation of energy into ovary in form of vittelogenine. The fecundity was
found to range from 6,158 to 22,783 eggs, where the maximum fecundity 22,783 was observed in June.
Fecundity bears stronger relationship with gonad weight and body weight. The regression equation for
gonad weight and fecundity, body weight and fecundity was estimated as F=844.3 GW+3092 (r
=0.875)
and F= 63.88 BW-9678 (r
2
=0.501), respectively. The relationship between fecundity and gonad weight
was significant and the correlation coefficient between fecundity and body weight was also significant and
provided a positive correlation. The relationship of body length and weight of female was found
BW=23.40 BL–456.8 (r²=0.872) and male was found BW=28.93 BL-675.6 (r
2
=0.921), which was showed
significant correlation. The monthly values of GSI indicated that the main breeding season of C. striatus
was observed in the month of May to July where the peak breeding occurred in June in the natural habitat
of Sylhet.
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