Author(s): Dakua Sanjay, Santoshkumar Singh Abujam, Choudhury Parthankar, Biswas Shyama Prasad

Abstract: Length-weight relationship of Esomus danricus (Ham.) had been carried out from two different waterbodies of upper Assam during 2011-2013. The co-efficient of regression (b) was recorded as 1.007 in juveniles; 1.01 in males; 1.232 in females. The result reveals that females have better growth than males and juvenile. Again, the ‘b’ value was almost similar trend in all length groups of male while in case of female ‘b’ value was increasing with increase of length and recorded the highest 2.033 in >5 cm group. The finding indicates that both the sexes show allometric growth. Coefficient of correlation (r) shows more or less similar trend in all length groups’ irrespective male and female. Condition factor ‘K’ was found to be the highest (1.0198) in the 3-4 cm length group and that of the lowest (0.8141) in the >5 cm length group. In overall, the ‘b’ value of both sexes was also found to be similar trend in all the seasons and indicates that both the sexes did not follow the cube law (b=3). The lowest (0.789) ‘r’ was recorded in post-monsoon and highest (0.881) in pre-monsoon for males while the minimum (0.86) ‘r’ was observed in winter and the maximum (0.910) in pre-monsoon for females. Condition factor ‘K’ for male was found to be highest (1.344) in pre-monsoon and lowest (0.951) in winter, whereas for females it fluctuated from 0.876 (post-monsoon) to 1.238 (pre-monsoon).

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