HAIR CELL ORIENTATION PATTERNS ON THE SACCULES OF JUVENILE AND ADULT TOADFISH, OPSANUS-TAU

Saccules from 10 adult (five female, five male) toadfish (Opsanus tau), 13.5-26 cm standard length, were examined for individual/sexual variation in the hair cell orientation pattern. In addition, sac cules from two juveniles (5 and 6 cm standard length) were compared with those of the adults to determine whether maturational differences exist in the hair cell orientations. The hair cell orientation pattern is unlike any reported previously for this species or its congener, O. beta. There are no major differences between the hair cell orientations of males and females, nor between the juveniles and the adults. A slight individual variation is present in the proportion of hair cells oriented in a particular direction in a specific area of the sensory epithelium. Potential ramifications of this hair cell orientation pattern are discussed with regard to development and auditory processing.