Ranjana Kumari* & Arun Kumar
P.G. Department of Zoology, B.N.M. University, Madhepura, Bihar, India
Received : 10th December, 2019 ; Revised : 21st January, 2020
Abstract: Channa striatus (Bloch) has been gaining importance as a common nutrition rich fish. Mean RLG value was found to be highest in the size group of 5.0-10.0cm (0.55) and lowest in the size group of 21.1-25.0 cm. (0.46). The results reveal that the species fall in the carnivorous category. Gut content analysis reveal that zooplankton was the highest percentage (12.50) occurrence in July, insects was found to be highest (23.53%) in June. The highest percentage of crustaceans was observed in February (22), annelids was highest in April (7.40), molluscs occurred in April (3.70) and occurrence of fish in
the gut was in September (55.56). The highest percentage of plant matter noticed in January (15.09) andmucks and unidentified components was observed in December (23.26). Analysis of gut contentrevealed that in fry stages most dominant food item was zooplankton (68.52%), followed by insect (25.2%), annelids (5.01%),crustacean (1.02%) and plant matter (0.25%). In juvenile the most preferred food item being insects (31.16%), followed by trash fishes (30.82%), crustaceans (19.82%),
annelids (12.18%), plant matter (4%) and molluscs (2.02%). In adult, a strong positive selection was observed for fish (46.37%), insects (12.45%), mucks and unidentified material (12.04%), plant matter (10.12%), crustaceans (9.16%), annelids (6.84%) and molluscs (3.02%). Gastro somatic index (GSI) was ranged from 1.15 ±0.36 (August) to 5.14 ±1.76 (April) for males and that of female from 2.24 ±1.10 (December) to 9.52±3.91 (September).