Effect of Salinity and Ammonia on the Growth and Haematology of Catla catla (Hamilton, 1822)
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Date
2020-12
Authors
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
The 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.
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