Effect of different stocking density on growth, survival on Litopenaeus vannamei (Boone, 1931) in summer and monsoon crop in province of Gujarat States in India

A shrimp Pacific White shrimp, Litopenaeus vannamei growth performance study during summer (S) and monsoon (M) was taken up for 120 days. The stocking density was 30, 40, 50, 60, 70 and 80pc/m2 in six different treatments with three replicate. Experiment was conducted in 18 commercial culture pond having 0.5 ha size. The initial average body weight of shrimp post larvae during summer and monsoon crop at stocking was 0.06±0.01g and 0.06±0.04g, respectively. The data revealed significant (p<0.05) difference in mean growth during summer and monsoon crop at different stocking densities with individual final weights of 26.08±0.05 followed by 23.84±0.27, 19.94±0.07, 18.24±0.43, 16.92±0.23 and 14.61±0.49g and yields of 3721.5±68.4, 4440.5±125.1, 4548.05±56.9, 4948.4±96.4, 5064.8±82.1 and 4792.4±211.4 kg/pond at 30, 40, 50, 60, 70 and 80 shrimp/m2, respectively. In contrast, there were statistically significant differences in mean growth and final yields during the monsoon crop. Final mean weights were 34.46±0.24 followed by 31.2±0.31, 28.46±0.12, 25.89±0.35, 20.86±0.11 and 18.20±0.42 g and yields were 5091.6±57.6 followed by 6143.6±67.15, 7457.6±100.9, 7905.06±283.2, 7799.2±277.3 and 7292.6±165.1 kg/pond at 30, 40, 50, 60, 70 and 80 shrimp/m2, respectively. Better performance of shrimp was recorded in monsoon crop, average water temperatures was 26.17±0.15°C with compare to summer 29.86±0.11°C with low production. Larger shrimp were associated with lower stocking density in both the season while higher stocking density @70 shrimp/m2 (summer crop) and 60 shrimp/m2 (monsoon) produced higher yields.