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Effects of electrode placement relative to the cardiac muscle on ECG pattern in carp [Cyprinus carpio L.]

100%

Klyszejko B., Dziaman R., Hajek G.

Acta Ichthyologica et Piscatoria

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2001

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tom 31

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nr 1

Effects of electrode placement on the ECG quality were studied in 200-1500 g individual weight carp. Out of 12 combinations of lead placement relative to the cardiac muscle, 3 were found to produce the most legible, reproducible ECG′s.

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The effect of MS-222 on the cardiac dnd respiratory function and behaviour of common carp, Cyprinus carpio L., during general anaesthesia

100%

Dziaman R., Klyszejko B., Hajek G.

Acta Ichthyologica et Piscatoria

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2005

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tom 35

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nr 2

Background. Assessments of the efficacy of anaesthetics are usually based on observations of fish behaviour or changes in blood parameters. In this study we attempted to assess the process of anaesthesia, caused by MS-222, based on the measurement of heartbeat and respiratory frequency. Materials and Methods. The effect of four concentrations of MS-222 (75, 100, 125, and 150 mg · L-1) on heartbeat and respiratory frequency of common carp, Cyprinus carpio L., were studied using ECG. Concurrently (during general anaesthesia) fish behaviour was also observed. Results. The behavioural reactions were similar for all four treatments. The first symptom was agitation followed by sedation, loss of equilibrium, and deep anaesthesia. Small differences were observed during initial contact of fish with the anaesthetic. The ECG analysis, however, revealed significant differences in heartbeat and respiratory frequencies related to the concentration used. Irrespective of the MS-222 concentration used, the recovery time was similar in all treatments and did not exceed 5 minutes. Conclusion. The ECG method can be an important and objective tool supplementing the data acquired during visual observations of responses to anaesthesia. Its major advantage is the comparativeness of data.

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Studies on the distribution, abundance, growth pattern and dietary habits of Brycinus nurse Ruppel, 1832 [Osteichthyes: Characidae] in the river Jamieson, Nigeria

80%

Ikomi R. B., Sikoki F. D.

Acta Ichthyologica et Piscatoria

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2001

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tom 31

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nr 1

Aspects of the ecology of Brycinus nurse Ruppel, 1832 in the River Jamieson, Nigeria were studied. B. nurse constituted 19.8% of the characid catch and was unevenly distributed in the river with perennial occurrence in the downstream station. Peak abundance was at the beginning of the dry season. Fish size ranged from 7.0 to 19.0 cm standard length and weighed 40.5-171.0 g. The growth pattern was allometric. Condition factor ranged from 1.99 to 2.65 and varied with individual length of fish. Condition factor was slightly higher during the wet season. B. nurse fed primarily on plant fragments and seeds and Hymenoptera while algae and various alate insets were of secondary importance. Immature aquatic insects were incidental food items. B. nurse was essentially both day and night time feeder with only quantitative variations in dietary habits in relationship to size and season.

Ograniczanie wyników

3 Acta Ichthyologica et Piscatoria

2 Dziaman R.

2 Hajek G.

2 Klyszejko B.

1 Ikomi R. B.

1 Sikoki F. D.

1 2005

2 2001

Effects of electrode placement relative to the cardiac muscle on ECG pattern in carp [Cyprinus carpio L.]

The effect of MS-222 on the cardiac dnd respiratory function and behaviour of common carp, Cyprinus carpio L., during general anaesthesia

Studies on the distribution, abundance, growth pattern and dietary habits of Brycinus nurse Ruppel, 1832 [Osteichthyes: Characidae] in the river Jamieson, Nigeria