Salinity
induced changes in growth and gill structure of
freshwater
carp, Cyprinus carpio Linn.
G.
Singh1, M.D. Ansal2*, A.H. Shanthanagouda2,
V.I. Kaur1 and N. Bansal3
1Department of
Aquaculture, College of Fisheries, Guru Angad Dev Veterinary and Animal
Sciences University, Ludhiana-141 004, India
2Department of
Aquatic Environment, College of Fisheries, Guru Angad Dev Veterinary and
Animal Sciences University, Ludhiana-141 004, India 3Department of
Vety. Anatomy and Histology, College of Veterinary Sciences, Guru Angad Dev
Veterinary and Animal Sciences University, Ludhiana-141 004, India
*Corresponding
Author Email :
ansalmd@gmail.com
*ORCiD:
https://orcid.org/0000-0003-3511-983X
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Abstract
Aim:
The present study was carried out to evaluate salinity induced changes in the
growth and gill structure of cosmopolitan freshwater carp, Cyprinus carpio
(Linn.).
Methodology: Inland saline water (15 ‰ or g l-1) was
collected from the salt affected waterlogged areas of village Shajrana
(30.3346 0N, 74.1196 0E) in District Fazilka, Punjab (India) and diluted with
underground freshwater for preparing different salinity levels (2 to 10 ‰).
Fingerlings (10 ±2 cm) of C. carpio were exposed to 0 (control), 2, 4, 6, 8
and 10 ‰ salinity after gradual acclimatization with salinity increase @ 1 ‰
hr-1.
Results:
At the end of 120 days of rearing under saline conditions, 100% fish survival
was observed up to 6 ‰ salinity, while 86.66 and 70.00% survival was recorded
in 8 and 10 ‰, respectively. However, fish growth declined significantly at
all salinity levels (p≤0.05). Gill structure was also affected at all
salinity level, but pronounced changes were observed at salinity levels ≥ 6
‰, including lamellar oedema, epithelial lifting, lamellar hyperplasia,
hypertrophy, lamellar fusion, hyalinisation, aneurysm, blood congestion, etc.
Interpretation: The results offer
referral database to explore optimised economic production of common carp in
inland saline areas of the region at salinity levels below 6 ‰.
Key words: Carp, Gills, Growth, Production, Salinity, Survival
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