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Energetics of Resting Metabolism in an Indian Major Carp (catla Catla Ham.)

S.C. Chakraborty
Department of Fisheries Technology, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

M. Das
Department of Aquaculture, BAU, Mymensingh 2202, Bangladesh

A. K. Sarker
Department of Chemistry, BAU, Mymensingh 2202, Bangladesh

M.A. Kafi
Department of Fisheries Technology, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh

Abstract/ Executive Summary:

Resting metabolism in Indian major carp, Catla catla Ham. fingerlings was investigated. For this purpose a water reconciliatory system in the laboratory was used. The metabolic energy losses were determined by the indirect method of oxygen consumption by the fish and was then multiplied by an oxycalorific coefficient. Five metabolism chambers in the experimental system were used where there were two same treatment runs in quadruplicate of mean total weight of fish fingerlings of 109.5, 110.4, 112.8 and 111.6g/chamber. The water temperature in the system was 28±0.5°C. The mean metabolic rate in the replicates showed no significant variation (p>0.05) and was found to be 151.66, 153.9t 150.25, 152.74 mg O/kg/h respectively. This showed an equivalent energy loss 5.40, 5.52, 5.51 and 5.56 KJ/chamber/day (35.60,35.92,36.67 and 36.40 KJ/kg/day) respectively.

Keywords: Resting metabolism, Catla catla, Energetics

Location: Bangladesh Agricultural University

Start Date: 00-03-1995

End Date: 00-08-1995

Program Area: Animal Health and Management

Commodity: Carp fish

Objectives:

To determine the pattern and amotmt of loss of energy in Catla catla through resting metabolism in metabolism chamber.

Methodology:

Ten fishes in four replicates (each fish weighing 10 - 11 g) in metabolism chambers were randomly selected from the acclimation pool by a scoop net and weighed by a sensitive balance and then released in the metabolism chamber. Two days before the start of the experiment, fishes in chambers were not fed. The metabolism chambers were named as A, B, R, C and D. The chamber 'R' was used as reference to determine the dissolved oxygen content in the system water and had no fish in it. Whereas, the other four chambers A, B, C and D contained fish. A constant water flow rate of 30 L/h through the flow meter was maintained in all metabolism chambers during direct monitoring of oxygen consumption. After the first day in unfed condition for acclimation in the chambers, fish were subjected to measure the resting metabolic rate for another three unfed days. Twenty four hours hourly measurement of oxygen consumption by the fish in metabolism chambers was done directly by an oxygen probe (CheckMate, Mettler Toledo Ltd.) set inside the flowing water in cuvette in the system. The oxygen consumption by fish in each chamber was directly measured as mg/l. The values were expressed as mg O/kg/h using formula. The values were then converted into energy (KJ) by multiplying with suitable oxycalorific equivalent. An oxycalorific value of 13.56J/mg 0₂ oxygen was used in determining the resting metabolic rate in this case for starved fish. Hourly mean values over 24h period were calculated in order to obtain the pattern of daily resting metabolic rate and the total amount of energy lost in this respiration.

Source of Information: Bangladesh J. Fish. Res., 3(1): 87-93, 1999

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The water temperature in the system was 28±0.5°C. The mean metabolic rate in the replicates showed no significant variation (p>0.05) and was found to be 151.66, 153.9t 150.25, 152.74 mg O/kg/h respectively. This showed an equivalent energy loss 5.40, 5.52, 5.51 and 5.56 KJ/chamber/day (35.60,35.92,36.67 and 36.40 KJ/kg/day) respectively.

Knowledge Management: Journal