Coloration in Fishes

Different types of Coloration in fishes

1. Coloration in Fishes Submitted By : FoxtRot Romeo Submitted To : Dr. Sadhna Tripathi GOVERNMENT COLLEGE FOR WOMEN PARADE Department of Zoology

2. Table of Contents 1. INTRODUCTION 2. SOURCES OF COLOUR 2.1 Chromatophore 2.2 Iridiophore 3. CHROMATOPHORE RESPONSE 3.1 Physiological response 3.2 Morphological response 4. FACTORS AFFECTING COLOURATION 5. SIGNIFICANCE OF COLOURATION 5.1 Communication, Concealment, Disguise, and Advertisment

3. Introduction: Animal coloration is the general appearance of an animal resulting from the reception or emission of light from its surface. Coloration depends upon two important factors; the color and distribution of organism's biochromes,quality and quantity of light falling on the organism. There are several separate reasons why animals have evolved colors: Environment changes, Camouflage, disease, signaling, advertising, during life as well as mood etc.

4. COLORATION in fishes is primarily due to skin pigments in integuments,their rearrangement causes some species to exhibit right color while other show uniform shade Many species have general colouration and particularly characterstics marking in the form of bars.,stripes,spots and blotches.

5. Chromatophores Pigment cells are defined as cellular systems that effect coloration of the skin The chromatophores are found in the dermis layer of the skin They have pigments containing intracellular bodies called chromatophores

6. Fig. Structure of chromatophore

7. C h romatophores (contd) Fishes have only four biochromes,varied color patterns are obtained by mixing of these exsisting pigments in variable proportions Melanophores,Erythophores and Xanthophores are called the light absorbing chromatophores Iridiophores are called as the light reflecting chromatophores

8. Classification of Chromatophores Chromatophores Pigments Source Color Melanophores Melanin Diet Black/Brown Erythophores Carotenoids Diet Red/orange Xanthophores Carotenoids Diet Yellow Iridiophores Guanine Diet White

9. Chromatophore Response Physiological Response : ( Neural and Hormonal ) Redistribution of pigment organelles within the boundary of the cell. Morphological Response : Involve increase or decrease in number of 4 cells or the amount of pigment they contain.

10. Significance of color change in fishes Patterns of colouration and ability of the fish to change it, helps the fishes in various ways such as CONCEALMENT DISGUISE ADVERTISMENT

11. Concealment It provides protection to fish by concealment from the enemy (camouflage). Various kinds of concealing colour methods are : Obliterative coloration Variable colour resemblance Disruptive colouration

12. (Scomber scomber) (Canthigaster callistera ) Leptocephalus ( larvae of eel) Larve change in pencil like form (Obliterative Coloration) (Variable Color Resemblance)

13. (Angel Fish)

14. Disguise When an animal exhibits colour pattern, form or posture such that it resembles either an animal or plant or sometimes a lifeless object Deflective marks are important here, thought of deflecting the animal to more or less vital parts of body to some other parts

15. Amia (Bowfin) Chaetobon unimaculatus (Disguise)

16. Advertisement Some forms of colouration of fish appear to advertise or to reveal rather to conceal their presence. Warning colouration, threatning colouration, cleaning and indication of mating are its important types.

17. Serpent eel Ameca splendens

18. THANK YOU