Effects of stocking density on blood chemistry and amino enzymatic activity of juvenile Nile tilapia Oreochromis niloticus (Linnaeus, 1758) in hyperosmotic rearing condition
1 Aquaculture Department, College of Fisheries, Mindanao State University - Tawi-Tawi College of Technology and Oceanography, Sanga-Sanga, Bongao 7500, Tawi-Tawi, Philippines.
2 Institute of Aquaculture, College of Fisheries and Ocean Sciences, University of the Philippines Visayas, Miagao 5023, Iloilo, Philippines.
Research Article
GSC Biological and Pharmaceutical Sciences, 2020, 11(02), 036-043.
Article DOI: 10.30574/gscbps.2020.11.2.0120
Publication history:
Received on 29 April 2020; revised on 06 May 2020; accepted on 07 May 2020
Abstract:
Nile tilapia Oreochromis niloticus, a euryhaline species, is a good candidate for culture in estuarine areas in the Philippine archipelago. Thus, the effects of stocking density on plasma cortisol, blood glucose, plasma aspartate transaminase (AST), and plasma alanine transaminase (ALT) were determined. The group of juvenile Nile tilapia O. niloticus (14.67 ± 0.12 cm TL and 44.57 ± 0.48 g W) was subjected to three different stocking densities (6, 12 & 24/60 L) for 14 days in 15‰ rearing condition. The experiment was composed of three treatments with triplicated groups arranged in a completely randomized design (CRD). Highest stocking density affected the plasma cortisol, blood glucose, plasma AST and ALT of Nile tilapia by increasing its concentration level in the blood. These manifestations suggest that overcrowding in Nile tilapia affects the physiological function through hormonal secretion, glucose utilization, and protein catabolism of the species.
Keywords:
Cortisol; Aspartate transaminase; Alanine transaminase; Plasma; Glucose.
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Copyright © 2020 Author(s) retain the copyright of this article. This article is published under the terms of the Creative Commons Attribution Liscense 4.0
