Size‐related oxygen consumption and ammonia excretion of Eurasian perch (Perca fluviatilis L.) reared in a recirculating system
Identifieur interne : 000932 ( Main/Exploration ); précédent : 000931; suivant : 000933Size‐related oxygen consumption and ammonia excretion of Eurasian perch (Perca fluviatilis L.) reared in a recirculating system
Auteurs : Vlastimil Stejskal [République tchèque] ; Jan Kou Il [République tchèque] ; Olga Valentová [République tchèque] ; Jitka Hamá Ková [République tchèque] ; Tomáš Policar [République tchèque]Source :
- Aquaculture Research [ 1355-557X ] ; 2009-12.
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Abstract
Oxygen consumption (OC) and ammonia excretion rates (AE) of perch were measured under commercial‐like conditions (temperature 23.3 °C) in both fed (F) and feed‐deprived groups (D). Measurements were taken in triplicate in six sized batches of perch ranging from 44.8 to 336.2 g. The mean daily OC was 288.3–180.6 mg O2 kg−1 h−1 for group F fish ranging in size from 44.8 to 279.4 g body weight. The mean daily AE expressed as total ammonia nitrogen (TAN) was 13.8–5.2 mg TAN kg−1 h−1 in the same groups. Daily peaks of OC in group F perch were observed 6 h after the onset of feeding for each size group with relatively stable values up to the end of feeding. Peaks of daily AE in group F perch were observed 10 h after the onset of feeding in each size group, with a rapid decrease up to 16 h after onset. In group D, OC was 181.1–110.5 mg O2 kg−1 h−1 in the weight range 57.9–336.2 g. The daily mean AE was 1.7–0.5 TAN kg−1 h−1 in this group. No dramatic peaks of OC and AE were observed in group D perch.
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DOI: 10.1111/j.1365-2109.2009.02316.x
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Measurements were taken in triplicate in six sized batches of perch ranging from 44.8 to 336.2 g. The mean daily OC was 288.3–180.6 mg O2 kg−1 h−1 for group F fish ranging in size from 44.8 to 279.4 g body weight. The mean daily AE expressed as total ammonia nitrogen (TAN) was 13.8–5.2 mg TAN kg−1 h−1 in the same groups. Daily peaks of OC in group F perch were observed 6 h after the onset of feeding for each size group with relatively stable values up to the end of feeding. Peaks of daily AE in group F perch were observed 10 h after the onset of feeding in each size group, with a rapid decrease up to 16 h after onset. In group D, OC was 181.1–110.5 mg O2 kg−1 h−1 in the weight range 57.9–336.2 g. The daily mean AE was 1.7–0.5 TAN kg−1 h−1 in this group. 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