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ThesisItem Open Access Productivity and Nutritional Composition of Fish in Relation to Nutritional Quality of Fish Feeds in Some Commercial Fish Ponds of Shri Muktsar Sahib District of Punjab(Punjab Agricultural University, Ludhiana, 2021) Lovepreet Kaur; Sehgal, G.K.The present study evaluated productivity and nutritional composition of a cultured fish species, Labeo rohita (Ham.) in relation to nutritional quality of feeds and on-farm feeding practices in six commercial fish ponds of Shri Muktsar Sahib District of Punjab. The ponds were divided into two groups (3 in each group). The productivity of the pond group 1 was 6.25 to 7.5t ha-1 year-1 and in group 2, it was 4.0 to 5.6 t ha-1 year-1. Nutritional composition of the fish varied seasonally. The moisture content was minimum in summer and maximum in monsoon. Slightly higher moisture content was noticed in the fish from pond group 2 (78.05%) than from the group 1 (77.88%). Crude protein content (CP) was lowest in winter and highest in summer. The fish from the pond group 1 had significantly higher CP content (17%) than those from the group 2 (16.1%). The crude lipid content also remained higher in the fish from pond group 1 than those from the pond group 2 in monsoon and winter (2.01% and 1.80%, respectively). Carbohydrates were highest in summer and lowest in monsoon. There were non-significant differences in carbohydrates between the two groups of ponds. Ash was maximum during summer (2.55%) and minimum in monsoon (1.13%). The fish ash content from group 1 ponds was higher than from the group 2 in summer and monsoon but in group 1 in winter. Gross energy (GE) was highest in summer and lowest in winter. The GE of the fish from the pond group 1 was higher than of those from the group 2. Nonsignificant differences in air and water temperature occurred except in water temperature in winter when it was higher in group 2. Non-significant differences between the two groups of ponds existed in Secchi disc transparency, pH, dissolved oxygen, total alkalinity, and salinity. Significantly higher dissolved phosphorus was recorded in group 2 in summer and monsoon. The total phytoplankton was higher in group 1 than in group 2 ponds. The average values were 221.31×105/L and 196.46×106/L in groups 1 and 2, respectively. There were seasonal differences in zooplankton also. The total zooplankton number remained significantly higher in pond group 1. The average values were 402.29 No./L and 352.12 No./L in pond groups 1 and 2, respectively. Farmers of ponds 1 and 6 used de-oiled rice bran as fish feed. In ponds 2, 3, 4 and 5 formulated feeds were used. Nutritional composition of fish feeds varied seasonally. Non-significant differences in moisture occurred in monsoon and winter. In summer, it was higher in group 2. Non-significant differences in CP content occurred. Significantly higher CL occurred in group 1 ponds. Non-significant differences existed in carbohydrates. Significantly higher ash content was in group 1 ponds. Aflatoxins were detected in all the feeds given in all the six ponds. Daily ration size was 2% of body weight per day except in pond 3 where it was 3%. Feeding frequency and time of feeding was once in the morning. The feed dispensing method was broadcasting except in ponds 3 and 4 where perforated sacs/drums were used. Crude protein and crude lipid of feeds had major effect on nutritional composition of fish.
