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ThesisItem Open Access Effect of parasites and minerals on growth performance of Litopenaeus vannamei (Boone)(CCSHAU, Hisar, 2023-01) Khushbu; Gulati, RachnaOn the basis of cultural area, shrimp farmers were classified into three groups: small farmers having up to 2 ha area, medium farmers with 2 to 4 ha area and large farmers having above 4 ha area. Maximum shrimp farmers procured shrimp seed of size post larvae PL 9-11from Tamil Nadu (60%) followed by West Bengal (25%) and Andhra Pradesh (15%) at price ranges between 0.50-0.60₹. Shrimp farmers stocked their ponds at different densities: less than 40 (70%), 40-60 (26%), above 60 (4%) numbers/m2. The shrimp farmers raised two crops (65%), more than two (35%) every year. The majority of shrimp farmers physically checked the soil and water quality characteristics of the ponds on weekly (35%) and monthly basis (65%). Fifty eight percent shrimp farmer faced poor feed conversion ratio (>1.5) and forty percent good FCR (<1.5). Farmers generally engaged farm consultants (87%) from adjacent shrimp farms and two laborers per hectare are employed from surrounding villages and other states and they were paid 8000-15000₹/labor/month. In 90-120 days, the average shrimp harvest yielded 5000 kg to 9000 kg/ha/crop.The total and operational cost was 3164561, 3051033.03, 2930496.03₹ and 2461473.00, 2379772.00 and 2305630₹ for small, medium and larger farmer. Benefit cost ratio for small, medium and large farmers was 1.05, 1.15 and 1.23. Bacterial disease was maximum recorded at Faridabad (17%) followed by Fatehabad (14%), Gurugram (13%), Jind(11%), Bhiwani (11%), Dadri (7%), Kaithal (6%) , Hisar (4%) and Jhajjhar (4%) and least number of bacterial disease was encountered at Rohtak shrimp culture pond (2%). The plankton analysis of shrimp culture ponds of Haryana recorded that varied between 50000-126,000/m3. Maximum concentration of nickel, zinc, copper, cobalt and chromium was at Guroothi (0.307ppm), Meham (1.680ppm), Bangaon (0.840ppm), Bangaon(0.560ppm), Kalayat (0.812ppm) and Kherilamba (3.225ppm). Growth performance of shrimp revealed that pathogenicity of Enterocytozoonhepatopenaei varied with different challenge methods in L. vannamei. EHP challenge via oral and injection in HP were more potent in reducing the growth of shrimps. It indicated that significantly higher Litopenaeusvannameiweight was recorded in healthy shrimp of control at all days of exposure and lesser increase in weight was recordedin oral (1.33g to 2.85g) and injection in hepatopancreas (1.44g-2.84g)method of EHP infection. The weight of shrimps was significantly higher (11.73 g) in control (0 ppm) and it decreased to 8.47, 7.88, 5.30, 3.83, 3.37, 3.12g with an increase in zinc sulphate dose from 0.5 to 1, 2, 4, 6 and 8 ppm. The weight of shrimps was significantly lower (11.73g) in control (102ppm) and it increased to 12.21, 12.90, 16.83g with an increase in calcium oxide dose from 200-600ppm. But at concentration higher than 600ppm weight of shrimps was significantly decrease 6.64, 5.29g at 700ppm and 800ppm. The results on the growth performance of shrimp revealed that higher doses of potassium chloride showed toxicity against L. vannamei. The weight of shrimps was significantly lower (11.73g) in control (155ppm) and it increased to 14.18, 14.99, 18.34, 23.23g with an increase in magnesium sulphate dose from 200-700 ppm. The weight of shrimps was significantly higher (11.73 g) in control (852ppm) and it increased to 13.33, 14.14, 17.49, 22.38 with an increase in sodium chloride dose from 1000 to 2000, 4000, 6000 and 8000 ppm. he LC50 values (concentration at which 50 percent mortality occur in L. vannamei) along with regression statistics for zinc sulphate, calcium oxide, potassium chloride, magnesium sulphate and sodium chloride was 0.71,720, 505.5,1 284 and 8565.4ppm. The weight of shrimps was significantly higher (7.89 g) in Azolla based feed than commercial feed (6.55g).
