This enterprise is designed to serve 'Ichthyology-practicing' students and the like, whether pursuing syllabus-oriented or competitive exam-oriented courses in India or other South-Asian countries. To maintain continuity with the contents of PART - 2, the light-emitting photophores and electric organs are elaborated in CHAPTER - 1 and CHAPTER - 3, respectively, of this 'PART - 3' of the SERIES. 'Biofluorescence' is another curious phenomenon...