author(s)
Kamei Lanthaimeilu and Dr. Pampa Bhattacharjee

abstract
The Relative gut length (RGL) and Gastro-somatic index (Ga.SL) of Trichogaster fasciata and Pethia conchonius were observed and the correlation ‘r’, regression constant ‘a’ and ‘b’ and coefficient of determination ‘R²â€™ were also analyzed to find out the relationship between gut length and body length. The regression equation for both the species is Y=124.868+8.205SL (T. fasciata) and Y=84.747+4.104SL (P. conchonius). The highest value of RGL and Ga.SI was observed in large size group fishes, except in T. fasciata. The present study reveals that both the species changes their feeding habits from carni-omnivorous to herbi-omnivorous as it increase in size but in P. conchonius it is found that feeding habit again changes from herbi-omnivours to carni-omnivorous. The feeding intensity is inversely related with the gonadal development which means that the Ga.SI decreases accordingly.