10* 



10 



I 



10* 



IO 



I 

 ,o 3 



IO 



10 



I 

 IO 2 



10 



I 



IO* 



10 



I 



lot- 

 10 



MARCH 



B — _ 



APRIL 



~ 





MAY 

 NO Genyonemus in Somples 



F'™  m 





JUNE 

 NO Genyonemus in Samples 



JiL 



9 12 15 IO 21 & 27 30 O 3 6 9 12 15 18 21 24 27 30 O 3 6 9 12 15 18 21 24 27 30 O 3 6 9 12 15 B 21 24 27 30 



^ 



\ 

 </) 



I 



! 



! 



JULY 

 NO Genyonemus in Somples 



NO Gen y onemus in Somples 



AUGUS"! 



Ml 



SEPTEMBER 

 NO Genyonemus in Samples 



OCTOBER 

 NO Genyonemus in Samples 



NO Genyonemus in Samples 



O 3 6 9 12 15 18 21 24 27 30 O 3 6 9 12 15 18 21 24 27 30 O 3 6 9 12 15 18 21 24 27 30 O 3 6 9 12 15 18 21 24 27 3d 



IO J 



IO 2 



IO 



I 



IO 2 

 IO 



I 



IO 3 

 IO 2 



IO 



NOVEMBER 



riri_ 



DECEMBER 



JANUARY 



FEBRUARY 





3 6 9 12 15 18 21 24 27 30 O 3 6 9 12 15 18 21 24 27 30 3 6 9 12 15 18 21 24 27 30 O 3 6 9 12 15 18 21 24 27 30 



STANDARD LENGTH (mm) 



FIGURE 3.— Mean monthly concentrations of 10 larval size classes of white croaker, Genyonemus lineatus, in three water 

 column levels, March 1978-February 1979. Each monthly value represents a mean of 4 replicates from each of 4 transects 

 (total replicates = 16). 



During the course of the study, no relationship 

 between larval abundance and distribution and 

 tidal stage, sea state, or stage of the moon was 

 noted. 



Vertical length-frequency distributions of all 

 three species examined appear to be related to 

 mode of feeding of each larval species, develop- 

 ment during life history, and availability of food 



in the study area. The relationship between food 

 availability and survival of larval northern an- 

 chovy is well documented. Larval anchovy re- 

 quire cells of 40 /urn diameter in concentrations 

 near 30 particles/ml (Lasker 1975, 1978). Lasker 

 (1975) observed extensive feeding of anchovy lar- 

 vae at the chlorophyll maximum layer, and 

 Hunter and Thomas (1974) stated that anchovy 



899 



