V3I5P92

Comparative Assessment of Growth and Water Quality in Fry and Fingerlings of Labeo rohita Reared under Biofloc Technology 

Dr. Ankit Kumar^1*, Dr. Nageshwar Wast², Dr. Jyotsna Kumari³, Mr.  Shivam Kumar⁴, Miss Muskan Kumari⁵

Abstract

The present study was carried out to comparatively evaluate the growth performance and water quality dynamics of fry and fingerlings of Labeo rohita cultured under a biofloc-based zero water-exchange system. A total of 180 fish, equally distributed between fry and fingerling stages, were maintained under controlled indoor culture conditions. Important physicochemical parameters including temperature, pH, dissolved oxygen, ammonia, nitrite, nitrate and total suspended solids were monitored throughout the experimental period. Growth performance was assessed using specific growth rate (SGR), feed conversion ratio (FCR) and weight gain percentage (WG%).

The biofloc system showed progressive microbial development, which was reflected by a continuous increase in total suspended solids and nitrogenous metabolites during the culture period. Although dissolved oxygen and pH declined moderately, all parameters remained within acceptable limits for carp culture. Comparative analysis revealed that fingerlings performed better than fry in terms of growth and feed utilization efficiency. During the fry stage, SGR increased from 1.13 ± 0.21 to 1.87 ± 0.28 % day⁻¹, while FCR decreased from 2.18 ± 0.23 to 1.42 ± 0.28. In fingerlings, SGR increased from 1.48 ± 0.18 to 2.12 ± 0.25 % day⁻¹ and FCR declined from 1.98 ± 0.17 to 1.38 ± 0.22. Weight gain percentage also increased significantly in both stages (p < 0.001).

The findings indicate that biofloc technology provides a stable and productive culture environment for Labeo rohita and that fingerlings exhibit comparatively better adaptability and nutrient utilization efficiency under biofloc conditions. The study supports the use of biofloc technology as a sustainable and resource-efficient strategy for intensive carp aquaculture.

Keywords:

Biofloc technology; Labeo rohita; fry; fingerlings; growth performance; water quality; sustainable aquaculture