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Volume 47 Number 6 Volume 48 Number 1

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Research articles

ScienceAsia 48 (2022): 82-88 |doi: 10.2306/scienceasia1513-1874.2022.005

Effects of different substrates on the growth and composition of periphyton in the low saline groundwater system

K.S. Vijay Amirtharaja,*, B. Ahilanb, C.B.T. Rajagopalsamyc, Rosalind M. Georged, P. Jawahare

ABSTRACT:     The growth and composition of periphyton in low saline groundwater (5 ppt) were evaluated using 5 different substrates: split bamboo poles (SBP), green shade net (GSN), high density polyethylene (HDPE) sheets, low density polyethylene (LDPE) sheets, and polyvinyl chloride (PVC) pipes). The effect of substrate type, submersion time, and depth was evaluated. The average submersion depth of all the substrates was maintained at 88.27 cm, and this trial was conducted for 60 days. Chlorophyll a, dry weight, ash, ash free dry weight, and periphyton diversity were analyzed. The growth of periphyton in terms of chlorophyll a value on different substrates has revealed a higher mean value for bamboo substrate (6.82 ± 2.79 µg/cm2), followed by green shade net, HDPE, LDPE, and PVC with values of 5.24 ± 2.27 µg/cm2, 4.64 ± 2.06 µg/cm2, 4.51 ± 2.08 µg/cm2, and 3.10 ± 1.57 µg/cm2, respectively. The mean values of dry weight recorded were 1.81 ± 0.78 mg/cm2, 1.65 ± 0.70 mg/cm2, 1.29 ± 0.56 mg/cm2, 1.32 ± 0.57 mg/cm2, and 0.78 ± 0.45 mg/cm2 for SBP, GSN, LDPE, HDPE, and PVC substrates, respectively. In all substrates, there was a significant difference observed in the development of periphyton over time (p < 0.05). There was no significance (p > 0.05) observed in Chlorophyll a value with depth in all 5 different substrates.

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a Mariculture Research Farm Facility, Department of Aquaculture, Fisheries College and Research Institute, Thoothukudi 628105 India
b Dr.M.G.R Fisheries College and Research Institute, Ponneri 601204 India
c Department of Aquaculture, Dr. M.G.R. Fisheries College and Research Institute, Ponneri 601204 India
d Department of Fish Pathology and Health Management, Fisheries College and Research Institute, Thoothukudi 628008 India
e Tamil Nadu Dr. J. Jayalalithaa Fisheries University, Nagapattinam 611002 India

* Corresponding author, E-mail: vijayamirtharaj@tnfu.ac.in, ksvijay444@gmail.com

Received 19 Dec 2020, Accepted 28 Jun 2021