BOLZ and LOUGH: GROWTH OF LARVAL COD AND HADDOCK 



FIGURE 3. — Scanning electron micrograph of sagitta from 30-d- 

 old haddock larva, 9.5 mm SL. Note the 1-2 poorly defined 

 increments enclosed by the nuclear check (nc), the faint incre- 

 ments between the nuclear and yolk-sac (yc) check marks, and 

 the series of very thin increments (th) immediately encircling the 

 yolk-sac check. 



or 



UJ 



i — 



UJ 



2: 



(X 





400_ 



3oo_ 



200 



100_ 



SflGITTfl u; 



D = 19.351 - 83. 43, 



IPPJLLUS (©) 

 D = 7.37L - ID. 31 



ASTERJSCUS U) 



D = 8. OIL - 6B. 81 



10 15 



5TRNDRRD LENGTH (nn) 



FlGl RE 4.— Plot of otolith diameter: standard length fitted with linear regression lines for the three pairs of otoliths (sagitta, lapilli, and asterici) 



dissected from the inner ear of larval Atlantic cod. 



ber of increments equals days from hatch (Radtke 

 and Waiwood 1980; GjosaeterandTilseth 1982), cod 

 growth through the first 2 mo of life may best be de- 

 scribed by the exponential relationship: 



L 



4.82e - 0250 *, r = 0.92 



(1) 



where L 

 R 



standard length in mm, and 

 number of days (increments) from 

 hatch. 



The average growth rate of cod larvae was 0.18 mm/ 

 d through the first month and 0.28 mm/d through 2 



831 



