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ThesisItem Open Access Effect of Salinity and Ammonia on the Growth and Haematology of Catla catla (Hamilton, 1822)(SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA, 2020-12) MOHANA SWAPNA, NARRA; Ramana, T.V. (MAJOR); Balasubramanian, A; Neeraja, TThe present study was carried out to study the effect of salinity and ammonia (TAN - Total Ammonia Nitrogen) on the growth and haematology of Catla catla juveniles. Before start of study, lethal studies were conducted to determine the treatment level of Salinity and TAN. These studies revealed that 100 percent survival could be obtained in the salinity of 10 ppt and 20 ppm TAN. Accordingly, the study was designed to conduct in two phases for a period of 30 days each at different salinities [control (0 ppt), 3 ppt, 6 ppt and 9 ppt] and TAN levels [control (0 ppm), 10 ppm, 15 ppm and 20 ppm] in triplicates stocking with 10 fishes in each tank. Water quality parameters of the experimental tanks were estimated every day; while growth and haematological parameters were estimated on weekly basis. In salinity experiment, all growth parameters like length-weight, Specific Growth Rate (SGR), Protein Efficiency Ratio (PER) were in decreasing trend from 0 Author : MOHANA SWAPNA NARRA Title of the thesis : “Effect of Salinity and Ammonia on the Growth and Haematology of Catla catla (Hamilton, 1822)” Submitted for the Award of degree : Master of Fisheries Science in Fisheries Resource Management Faculty : Faculty of Fisheries Science Department : Department of Fisheries Resource Management Major advisor : Dr. T. V. RAMANA University : Sri Venkateswara Veterinary University, Tirupati Year of Submission : 2020 ppt to 9 ppt. However, Feed Conversion Ratio (FCR) values were found high at 0 ppt followed by 3 ppt, 6 ppt and 9 ppt. Similarly decreasing trend in haematological parameters viz., Total Erythrocyte count (TEC), Haemoglobin (Hb), Haematocrit (Ht) and Mean Corpuscular Haemoglobin Concentration (MCHC) was found from 0 ppt to 9 ppt though Total Leukocyte Count (TLC) showed an increasing trend. The maximum value of Mean Corpuscular Volume (MCV) was recorded at 3 ppt followed by 0 ppt, 6 ppt and 9 ppt. The alterations in growth parameters were attributed to the stress and reduced feed intake by fishes which were caused due to the hypertonic environment. The changes in the composition of blood were caused due to immunological activity, lymphopoiesis, reduction in erythrocyte counts and haemoglobin percentages. In second phase of ammonia study, growth factors like length and weight, SGR, PER were decreased with increase of TAN levels despite the FCR increased with TAN. These changes might be due to the low feed intake and utilization of high energy to overcome unfavourable conditions. In haematological parameters TEC, Hb, Ht and MCHC were low in 20 ppm compared to other two treatments 15 ppm, 10 ppm as well as control but TLC increased in 20 ppm which indicates the fish was in high stress level. MCV values were altered with peak at 10 ppm followed by 0 ppm, 20 ppm and 15 ppm and these alterations were due to the reduction in the Hb and Ht values.
