Quantitative (?morphological?) colour changes on prolonged black and white background adaptations of the minnowPhoxinus phoxinus (L.) and the effects of chromatic spinal section on these colour changes

Rostami, A.

doi:10.1007/bf00693605

Cited by 5 publications

(1 citation statement)

References 43 publications

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“…Seventy minnows were then selected for the experiment. After injection with noradrenaline to bring about pigment aggregation and anaesthetization with urethane a photograph of each fish was taken for future reference to show an area in front of the caudal fin (Ahmad, 1972). Marked animals were then placed in black aquaria for 2 wk to induce formation of new melanophores through quantitative ("morphological") colour change.…”

Section: Methods and Techniquesmentioning

confidence: 99%

Transitory colour changes in the new melanophores formed by quantitative colour change in the minnow Phoxinus phoxinus

Rostami

1974

Journal of Zoology

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Minnows (TeJeosiei: Phoxinus phoxinus (L.)) were exposed on a black background for varying periods to allow melanophore formation. The ages and times of appearance of melanophores were photographically determined. The background responses of the newly‐formed melanophores were assessed microscopically in fixed preparations of animals killed in liquid nitrogen at different time‐intervals. The results were interpreted according to the generally accepted belief that rapid and slow colour changes indicate nervous and hormonal mediation respectively. The age of the newly‐formed melanophores appeared to influence their background responses, the older melanophores being more responsive. It is suggested that the sensitivity to hormonal control develops first in the life of a pigment cell, to be followed later by sensitivity to nervous control. Nervous control, however, does not appear simultaneously for W/B and B/W adaptations but develops first for the latter. This differential development is considered to provide evidence for double innervation of melanophores.

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Section: Methods and Techniquesmentioning

confidence: 99%

Transitory colour changes in the new melanophores formed by quantitative colour change in the minnow Phoxinus phoxinus

Rostami

1974

Journal of Zoology

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The effects of drugs and ions on melanophore pigment movements and transmembrane potentials of stoneloach (Noemacheilus)

Collis

1984

J. Comp. Physiol.

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Studies on the colour-change mechanism in a fresh-water teleost,Nandus nandus (Ham.) I. Neural control

Jain

Bhargava

1979

J. Neural Transmission

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The existence and nature of chromatic fibres controlling the colour-change mechanism in the teleost, Nandus nandus has been studied by means of spinal sectioning at various vertebral levels of the animal between vertebrae 3 to 10. Spinal sectioning at or anterior to 5th vertebra completely eliminated the neural control of colour-change. As a result, the animal darkened to its maximum and the neural responses of different backgrounds were abolished. Spinal sectioning at or posterior to vertebra 6 did not affect the melanophores and at the same time did not interfere with the normal background responses of the animal. This study clearly shows that the chromatic fibres in this species run in the spinal cord and leave the latter at 5/6th vertebral level. Effect of adrenaline in the chromatic spinal-sectioned fish shows that the fibres innervating the melanophores are aggregating in nature and adrenergic in character. The results also suggest that the dispersed condition of pigment in the melanophores represents the "resting state" of the melanophores when they are under no stimulation.

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Quantitative (?morphological?) colour changes on prolonged black and white background adaptations of the minnowPhoxinus phoxinus (L.) and the effects of chromatic spinal section on these colour changes

Cited by 5 publications

References 43 publications

Transitory colour changes in the new melanophores formed by quantitative colour change in the minnow Phoxinus phoxinus

Transitory colour changes in the new melanophores formed by quantitative colour change in the minnow Phoxinus phoxinus

The effects of drugs and ions on melanophore pigment movements and transmembrane potentials of stoneloach (Noemacheilus)

Studies on the colour-change mechanism in a fresh-water teleost,Nandus nandus (Ham.) I. Neural control

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