232 



Fishery Bulletin 97(2), 1999 



Figure 3 



Photomicrographs (transmitted white light) of the dorsal halves of transverse sections of hapuku otoliths from (Al an 85-cm 

 female, northern, readability 3, estimated age (mean of R,, R^ j and R^^' H'' years; C = core, S = sulcus, arrows indicate a 

 compound opaque band, circles indicate opaque bands; (Bl an 87-cm female. Cook Strait, readability 4, age 14.7 years; (C) a 106- 

 cm male. Cook Strait, readability 4, age 19.0 years; (D) an 121-cm male, Kaikoura, readability .5, age 45.7 years. Scale bars = 1 mm. 



brand (terramycin or engemycin) or dosage and the 

 width or intensity of the OTG mark. Four hapuiiu 

 injected with OTC in July-October showed an OTC 

 mark that fell within an opaque band, indicating that 

 opaque bands are formed in the austral winter- 

 spring. The remaining fish was injected in Decem- 



ber and had an OTC mark at the distal edge of an 

 opaque band, indicating that hyaline band forma- 

 tion begins in spring-summer. 



The OTC results from all five hapuku are consis- 

 tent with the deposition of one hyaline-opaque band 

 pair on the otolith each year The hapuku that had 



