| dc.description.abstract | The Halda River of Bangladesh has immense importance as it is the only natural spawning ground of Indian
major carp species. The study was conducted for a period of 12 months from July 2013 to June 2014 in Halda
river at Garduara point in Chittagong districts of Bangladesh. Garduara point at the mouth of Boalia and Chengkhali
tributary of Halda river was selected by taking into consideration that the site will give shelter a large
number of fishes because it is the conjoined area where the Halda river meets with Boalia and Cheng khali
tributary. Sampling was done during full and new moon for two successive days in each month. A total of 53
fish species belonging to 18 families were identified. But the concerning fact was carp species of the Halda river
at Garduara point and 15 species were identified. Among them 5 were Not Threatened (NT), 2 Vulnerable (VU),
5 Endangered (EN) and 3 Exotic (EX). The Shannon-Weaver diversity index (H') ranged from 1.72 (in July) to
2.13 (in January), tiniest Margalef richness index was witnessed in November/December (1.05), while utmost
value observed in July (1.22), peak mean evenness value (0.79) was encountered in January and bottommost
(0.63) in July and the uppermost mean dominance value (0.85) was observed in January and lowest (0.7) in July.
The Shannon-Weaver and Pielou’s index was found to be significant among the seasons at 0.05% significance
level. But the Margalef and Simpson index was not significant among the seasons. The carp species of Halda
river at Garduara point found to be not evenly distributed. Among the Indian major carps encountered in the
study area, Catla catla found to be comprised 4.78% of the total biomass followed by Cirrhinus cirrhosus
5.74%, Labeo rohita 4.95% and Labeo calbasu 0.66%. The Halda river is used as breeding, nursing and feeding
ground by many fishes. So the proper management of this river is suggested. | en_US |
