Early Brood Development of Carp Fishes Utilizing Greenhouse Technology in Winter Seasons

Carp aquaculture is very popular in both seasonal and permanent ponds. Carp seeds are available for stocking in culture in late May and the ideal water temperature for carp gonad development is 28°C–32°C. The aim of this study was to develop the species’ broods in winter season by raising water temperature, utilizing the greenhouse concept. Two identical ponds, T1 (Greenhouse Pond, GHP) and T2 (Non-greenhouse pond, NGHP) each with three replications were used. Transparent polyethylene-sheet to a bamboo frame covered the T1, whereas no covering for T2. On December 1, 2020, 20 broods/pond stocked equally in the two ponds and reared until February 28, 2021. The mean water temperature of T1 was 28.67±0.49, 28.67±0.78, and 28.83±0.39°C in December, January, and February, respectively compared with T2 found to be 18.25±0.62, 18.58±0.52, and 18.92±0.51°C in December, January, and February, respectively. The average water temperature was 28.75°C and 18.58°C in T1 and T2, respectively. The statistical t-test revealed that the temperature in T1 notably increased in the winter than T2. About 90% of the broods matured within February in T1 while only 15% in T2. The growth of fish gonad was benefited from the usage of greenhouse technology in this study.