RICHARDSON: LARVAL FISHES OFF OREGON 



S 



c 



c 



o 



u 



.J 

 n 

 < 



a 



> 

 o 



< 





o 



> 0> 



CNcncN — 'O^o 00 



codcofN^io-— "^ ooo 



CO "1 "7 '~. 

 oivo'^'^oo- ooo 



CN 



■<T — — —^ 



0'-otv^rv!ot^ ooo 



— CO 



o^-^o■^ooo ooo 



O'^oW-^O'^ OO'^ 



O O (> o^^ 

 OCNCMiOuSoO OOO 



p CO 00 lO Ul UO CO 



— uSuSdcDcJuS ooo 



p p p p 

 oo — cmO — — ooo 



tj ooooooo ooo 



o 



ooooooo 



ooooooo ooo 



ooooooo 



ooooooo ooo 



— CO —^ —_ 



00^^•^0^^^-; ooo 



00 >o Of o. "9 "9 



O'^O^'COO— — ■— o 



ooooooo oo^o 



IT) in 

 OOOOCMOO cmoo 



O CO CO CO 



o CO o ■^' '^ o "^ 



ooo 



rs 

 O s cj. 





la:! 



- — C y 3 O) 



|SJ E a^ 

 > :" ^ -o -o -D 



CO ^ 3 4) 0) « 



■i^■t: o ^ ^ ^ 



■5 ^ c c c c 

 a.- o 4, (u (1) 



? S = -D "D T) 

 Oh tt, »! 3 3 3 



Table 3. 



taxa in the IKMT samples is probably due to 

 the greater volume of water filtered. 



Shallow vs. Deep Tows 



Shallow tows of the IKMT and bongos made 

 on the June and July-August cruises were com- 

 pared with the standard deep tows from the 

 same stations. Volume of water filtered was 

 approximately the same for each shallow and 

 deep pair. In shallow tows, positive samples (47 

 out of 64) yielded 20,629 fish larvae compared 

 with 18,087 larvae in 50 out of 64 samples from 

 deep tow pairs (Table 3). A total of 31 taxa were 

 taken; 17 occurred in both shallow and deep 

 samples, 3 occurred only in shallow samples, 

 and 11 were only in deep samples (Table 4). 

 Ninety-eight percent of all larvae were dis- 

 tributed in three families for shallow and deep 

 tows: 



Shallow tows: 



89.4% Engraulidae in 35.9% of all samples 

 5.7% Myctophidae in 31.2% of all samples 

 2.9% Osmeridae in 14.1% of all samples 



-Comparison of shallow and deep hauls from June and July- 

 August cruises according to gear. 



' IKMT = Isaacs-Kidd midwater trawl. 



701 



