Effects of Temperature and Stocking Density on the Ammonia Excretion Rate of Red Seabream, Pagrus major

An experiment was conducted to investigate the effects of temperature and stocking density on daily patterns and rates of total ammonia nitrogen (TAN) excretion in juvenile red seabream Pagrus major (mean body weight: 29.0 g) under fasting and feeding conditions. Fish were acclimated over 7 days und...

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Bibliographic Details
Published in:Ocean and polar research 2010, 32(1), , pp.63-71
Main Authors: Harwanto, Dicky, Oh, Sung-Yong, Kim, Chong-Kwan, Gultom, Victor David Nico, Jo, Jae-Yoon
Format: Article
Language:English
Subjects:
Marine
Pagrus major
해양학
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Summary:An experiment was conducted to investigate the effects of temperature and stocking density on daily patterns and rates of total ammonia nitrogen (TAN) excretion in juvenile red seabream Pagrus major (mean body weight: 29.0 g) under fasting and feeding conditions. Fish were acclimated over 7 days under four different temperatures (10, 15, 20, and 25 degree C) and at two different densities (5.5 and 11.0 kg m super(-3)). Each treatment had three replicates and a total of 216 fish were used. After 72 hours starvation, endogenous TAN excretion was measured for each temperature and density. To investigate exogenous TAN excretion, fish were handfed a commercial diet containing 51.6% crude protein twice a day for 7 days, at 08:00 and 16:00. Water was sampled from both inlets and outlets of chambers every 2 hours over a 24 hour period. Both endogenous and exogenous TAN excretion increased with increases in temperature and density (P
ISSN:1598-141X
2234-7313
DOI:10.4217/OPR.2010.32.1.063