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Title: A study on growth, feed efficiency and hematological changes in Pearlspot, Etroplus suratensis (Bloch, 1790) in response to varied salinities in raceway-based culture system
Authors: Ezhilarasi, V
Felix, S
Moses, T L S Samuel
Selvaraj, S
Keywords: Carcass composition;Growth;Hematology;Salinity
Issue Date: Sep-2020
Publisher: NISCAIR-CSIR, India
Abstract: A 60 days experiment was conducted in raceway tanks to determine the impact of salinity on growth, survival, carcass composition and hematology of Etroplus suratensis fingerlings. The experimental unit consisted of three treatments viz., T1 (0 ppt), T2 (15 ppt), and T3 (25 ppt). Complete randomized design (CRD) was followed with each treatment in triplicate. A total of 1500 fingerlings were stocked in each tank with an average body weight of 22.43±0.88 g. The results of the present experiment showed that fishes reared in 15 ppt salinities has showed an improved growth performance in terms of specific growth rate (0.35±0.01 % day-1), feed conversion ratio (0.11±0.01), feed efficiency ratio (8.72±0.52) and protein efficiency ratio (0.20±0.01), compared to 0 ppt and 25 ppt. Similarly, fishes reared in lower salinity (0 to 15 ppt) showed a better proximate composition compared to higher salinity of 25 ppt. In addition, fishes reared in 15 ppt salinity showed higher levels of hemoglobin (7.63±0.08 gm dl-1), red blood cell (1.6±0.12 million cum m-1), white blood cell (253000±57735 cells cum m-1) and packed cell volume (21.63±0.08 %). Likewise, low levels of platelet, mean corpuscular volume (135.80±0.32 Fl), mean corpuscular hemoglobin (48.53±0.17 pg) and mean corpuscular hemoglobin concentration (35.46±0.20 gm %)) were observed in 15 ppt reared fishes. From the current study it is concluded that E. suratensis can be acclimatized to different water salinity and thereby it can be suggested as a potential candidate for farming at 15 ppt salinity.
Page(s): 1571-1579
ISSN: 2582-6727 (Online); 2582-6506 (Print)
Appears in Collections:IJMS Vol.49(09) [September 2020]

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