Length-weight relationship and Condition factor of three freshwater eel fish species from Khan Sahib River, Tamil Nadu, India

The length-weight relationships (LWRs) and condition factor ( K n ) for three freshwater fish species of Mastacembelidae (Synbranchiformes) lies in the Khan Sahib River is presented. Fishes were collected monthly from October 2017 to September 2018 using trap and drag nets of mesh sizes between 3.5 to 10 mm. The estimated parameters of ‘ a’ and ‘ b’ for the freshwater eels were ranged from − 4.101 to − 4.596 and 2.625 to 2.751, respectively. The mean and standard (Mean ± SE) relative condition factor ( K n ) value ranged from 0.13 ± 0.01 to 0.34 ± 0.07 for Mastacembelus armatus , 0.14 ± 0.003 to 0.33 ± 0.08 for Macrognathus siamensis and 0.16 ± 0.01 to 0.26 ± 0.02 for Macrognathus aral . This work has provided a primary data base and calls for further studies of Mastacembelidae for deriving sustainable fishery strategies.