^"^ <? s*? >?P ^'? ^^^ S? ^*? ^^^ ..-P i^^ 



.\^ ^S- A- sV ^',- ^o>- ^^ 

 DEPTH (METERS) 



Figure 2.— Cumulative frequency distribution of juvenile and adult witch flounder by both fishing gears. Dash line: adults 

 (>30 cm); solid line: juveniles (<30 cm). A) No. 41.5 Yankee otter trawl, Division 4RS 1978-80 combined. B) No. 41.5 Yankee 

 otter trawl, Division 4R 1980. C) No. 36 Yankee shrimp trawl, Division 4R, 1980. D) No. 36 Yankee shrimp trawl, Division 

 3Ps, 1981. 



sets from two fishing gears for analysis of the north- 

 ern Esquiman Channel area of NAFO Division 4R 

 in 1980 takes into account biases in gear selectivity 

 (Fig. 3). In this study of the Gulf of St. Lawrence, 

 juveniles are more vulnerable to shrimp trawls as 

 Powles and Kohler (1970) showed in their study. 

 Low catches of adult witch flounder in all data sets 

 indicate that they are widely dispersed and not 

 readily accessible in any large numbers regardless 

 of fishing gears used. A discrete separation of adults 

 and juveniles does not exist. Although a large 

 percentage of adult witch flounder are found 



Figure 3.— Cumulative frequency distribution of juvenile and adult 

 witch flounder in the Northern Esquiman Channel area (north of 

 lat. 50°N). Catches of a No. 41.5 Yankee otter trawl and No. 36 

 Yankee shrimp trawl combined. Division 4R, 1980. 



100 

 90 

 80 



y- 



Z 70 



? 60 



UJ 



> 50 



i- 

 «t 



= 40 



z 



" 30 

 20 

 10 



-^ ^ ^ ^ ^ 



^' ^^ S" V -v t^ c^ '^ 



DEPTH (METERS) 



151 



