FECUNDITY OF GLOSSOGOBIUS GIURIS (HAM.) AND RELATIONSHIP BETWEEN FECUNDITY AND LENGTH-WEIGHT

Abstract

The fecundity of Glossogobius giuris (Hamilton) was estimated from 60 gravid females collected from local markets of Khulna during May to July 2005. Total length (TL), standard length (SL), total weight (W) and gonad weight (GW) were recorded and standard methods were used to calculate the fecundity and length-weight relationship. The fecundity of the species ranged from 39,173 (total length of 14.4 cm, body weight 22.79 g and egg weight 1.49 g ) to 557,892 (total length of 24.06 cm, body weight 104.56 g and egg weight 11.5 g). The mean fecundity was recorded as 280,315.89±102,223.51. The total gonad weight varied from 1.49 g to 11.5 g where the weight of the left lobe and right lobe of the ovary varied significantly (p<=0.05; t-value= - 2.536, equal variances assumed) from 0.7 g to 4.98 g and 0.71 g to 5.06 g respectively. The mean total egg weight was calculated at 5.99±1.82 g where the mean left lobe was calculated at 2.75±0.91 g and right lobe 3.17±0.90 g. The condition factor varied from 4.47 to 9.69 and the mean value was 8.09±0.72. The regression equation for total length and fecundity of the fish was estimated as F = 39,515.10 T – 531,548.17 (r = 0.683), Standard length and fecundity estimated as F = 50,366.48 S –502,295.20 (r = 0.664), Body weight and fecundity estimated as F = 4,430.22 W – 35,322.55 (r = 0.715), Gonad weight and fecundity estimated as F = 51,556.05 G – 28,762.62 (r =0.918), fecundity and condition factor estimated as F = 213,986.53 + 8,203.75 cf (r = 0.058). The diameter of the eggs of the left lobe varied from 5.3 to 8.6 µm with a mean of 7.4±0.6 µm while the right lobe varied from 5.1 to 8.9 µm with a mean of 7.2±0.8 µm. At 5% level of significance, log value of fecundity-gonad weight and fecundity-condition factor showed the most and the least significant relationship respectively.