Table 4.— Otolith increment deposition for known-age larval fish under experiments where various culture conditions were tested. 



below certain temperatures. In two other studies 

 where temperatures ranged from 24°C to 30°C 

 (Radtke and Dean 1982) and from 5.2°C to 11°C 

 (Neilson and Geen 1982), these temperatures af- 

 fected thegrowth rate and width of increments, but 

 did not alter the increment deposition rate 



Six studies looked at the relationship between 

 feeding and daily increment deposition. Jones (1984), 

 Geffen (1982), and Marshall and Parker (1982) 

 showed opposite effects of starvation on increment 

 deposition. Jones (1984) found that starvation of 

 young larvae for 2 wk resulted in deposition of only 

 one increment every other day. However, in addition 

 to lengthy starvation, the effect of short-term, in- 

 termittent periods of starvation was also studied and 



resulted in nondaily increment formation. Geffen 

 (1982) found that starvation interrupted deposition 

 in larval turbot, while Marshall and Parker (1982) 

 found that starvation for 2 wk had no effect on daily 

 deposition in sockeye salmon. Long-term starvation 

 experiments test for interruption of increment 

 deposition under extreme conditions. lb age larvae 

 in the field, it is important to determine the mini- 

 mum number of consecutive days of starvation need- 

 ed to affect increment deposition. Once these values 

 are known, it is important to determine whether field 

 larvae actually experience these levels of deprivation. 

 Three studies looked at feeding time or frequen- 

 cy on increment deposition. Neilson and Geen (1982) 

 found that feeding frequency could induce forma- 



97 



