RICHARDSON: SPAWNING BIOMASS AND EARLY LIFE OF NORTHERN ANCHOVY 



JULY 1977 



A. TEMPERATURE CO AT 3m 



B SALINITY (%o) AT 3m 



C Engroulis mordox EGGS (No / lOm' ) 



46° 



44° 



42° 



128' 



128= 



r 



124° 



128° 



D. Engroulis mordox LARVAE (No. /lOm^ )E Engroulis mordox ADULTS (No. /tow) 



46° 



44' 



X = 3.0 mm 



T 



24 59 



• X. 



/ 



9«3 



X = 4.1mm 



X = 5.2mm 



X = 3 8mm 



X = 6.7 mm 



X - 16.0 mm 



42' 



• * • X • •! . 



9*50 2007 TBS 



1 * «N • 

 '|409« \ 4818 \ 

 , 3559 5606 



22J2 26« 



•X 



1649 



ORE 



 J0( u* 



/ / / I I 



6 OC 



X = 10 6 mm 



75^/ ^^^2, 



\ 



• f'\' '1 



•p 



•X 



/ 







X 

 40 



128° 



126° 



124° 



128° 



126= 



124' 



Figure 5. — Results from the July 1977 acoustic survey off Oregon and Washington: hydrography, Engraulis mordox eggs, larvae, 

 adults. Values for adult catches are based on a 30 min surface tow of a pelagic trawl. Dotted lines delimit east and west cruise track 

 boundary. On C andD,"X" indicates location of the only bongo samples taken during this cruise. On E,"X" indicates location of pelagic 

 trawl stations. Mean standard length of anchovy larvae on each transect is listed along the left margin of D. Data in C and D courtesy of 

 Methot (text footnote 111. Data in E from Smith (text footnote 10). 



northernmost transect in 1976. No eggs were 

 taken in regions of active upwelling and few were 

 taken nearshore over the continental shelf except 



at the 9 km station just north of the Columbia 

 River mouth in 1976 where a patch of warm, <16° 

 C, surface water occurred. The farthest offshore 



865 



