Reprinted from THE AMERICAN JOURNAL OF PHYSIOLOGY, Vol. 44, No. 3 



October, 1917 



CONTRIBUTIONS FROM THE BERMUDA BIOLOGICAL STATION FOR 



RESEARCH. NO. 71. 



INTEGUMENTARY PHOTOSENSITIVITY IN A MARINE 

 FISH, EPINEPHELUS STRIATUS BLOCK 



HOVEY JORDAN 

 Received for publication July 21, 1917 



CONTENTS 

 I. Introduction 



A. Literature 259 



B. Purpose of experiments 260 



C. Material and methods 261 



II. Description of experiments 263 



A. Reactions of normal fishes 264 



1. To light and dark fields 264 



2. To regional stimulation 264 



B. Reactions of blinded fishes 265 



1. To light and dark fields 265 



2. To regional stimulation 266 



3. Photodynamic nature of the responses 267 



C. Exhaustion of the photoreceptors 268 



D. Location of the photoreceptors 269 



III. Conclusions 271 



IV. Discussion 271 



V. Bibliography 274 



I. INTRODUCTION 



A. Literature 



Experimental evidence, although it is not extensive, has consistently 

 indicated that the integuments of fresh-water fishes are photosensitive, 

 but that those of the strictly marine members in this class, on the 

 other hand, are insensitive to light. Parker ('09) states that the follow- 



259 



THE AMERICAN JOURNAL OF PHYSIOLOGY, VOL. 44, NO. 3 



