FISHERY BULLETIN: VOL. 70, NO. 4 



Juveniles and adult Diaphiis, separated from 

 micronekton hauls made on ETP I, have been 

 identified, with the cooperation of Robert Wis- 

 ner of Scripps Institution of Oceanography: 15 

 species were represented in the collection made 

 by Argo, David Starr Jordan, and Alaminos on 

 ETP I. D. pacificus was, by far, the most 

 abundant species, occurring in more collections 

 and in larger numbers than other species of 

 Diaphus. This species occurs in a broad coastal 

 belt, 600 to 800 miles wide, from lat 20°N to the 

 vicinity of the equator. Six species were taken 

 offshore, between lat 5° and 20°S, in the South 

 Pacific central water mass, including D. rolfbo- 

 lini Wisner, D. brachycephalus Taning, D. fra- 

 gilis Taning, D. jenseni Taning, D. schmidt 

 Taning, and D. spleMdidiis (Brauer). Five spe- 

 cies were taken in an oflfshore equatorial belt, 

 between lat 10°N and 5°S, including D. garmani 

 Gilbert, D. malayanus Weber, D. termophilus 

 Taning, D. lucidus Goode and Bean, and D. lut- 

 keni Brauer, the latter showing some admixture 

 with central water mass species. Species be- 

 longing to subgenus Diaphus, tentatively iden- 

 tified by Wisner as D. longleyi Fowler and D. 

 mollis-nanus complex had quite widespread dis- 

 tributions. 



Now that the species composition of adult 

 Diaphus has been clarified, life history series can 

 be determined for the more common kinds. 



Diogenichthys latematus (Garman) 

 (320 occurrences, 46,966 larvae) 



Larvae of D. latematus were outstandingly 

 abundant, making up 38.1 9f of the total fish 

 larvae obtained on ETP II. Almost twice as 

 many D. latematus larvae were taken in equiv- 

 alent coverage of the EASTROPAC region on 

 ETP II as on ETP I; 46,966 versus 24,315 lar- 

 vae. The number of collections that contained 

 D. laternatus larvae, however, was not much 

 different: 302 of 355 in ETP I as compared with 

 320 of 355 in ETP II. Almost one collection in 

 three from ETP II contained over 100 D. la- 

 tematus larvae, and 19 collections contained over 

 500 larvae. Of these larger collections, 13 of 19 

 were taken between lat 5° and 10 °N. As on 



ETP I, larvae of D. latematus were not taken in 

 collections made within the central water mass 

 of the South Pacific (Figure 13). 



Diogenichthys atlanticus (Taning) 

 (4 occurrences, 10 larvae) 



Larvae of this species were taken more fre- 

 quently on ETP I (29 occurrences, 92 larvae); 

 however, all but six of these occurrences were 

 in the portion of the ETP I pattern that was not 

 covered on ETP II. The four records on ETP II 

 were taken between lat 9° and 15°S, with two 

 occurrences in the transitional waters of the 

 Humboldt Current and only one occurrence off- 

 shore in the central water mass. Larvae of this 

 species were commonly taken on MARCHILE 

 VI off Chile (12 occurrences, 100 + larvae). 



Gonichthys tenuiculus (Garman) 

 (106 occurrences, 293 larvae) 



Larvae of Gonichthys had rather similar dis- 

 tributions and frequency of occurrences in the 

 two multivessel EASTROPAC surveys. The ma- 

 jority of larvae were obtained in the inner pat- 

 tern occupied by Rockaway, with highest fre- 

 quency of occurrences in an equatorial belt 

 between lat 5°N and 5°S (Figure 12). 



Hygophum atratum (Garman) 

 {66 occurrences, 521 larvae) 



The less extensive coverage on ETP II elim- 

 inated the area in which H. reinhardti (Liitken) 

 larvae were taken on ETP I, and only larvae of 

 H. atratum were observed in ETP II collections. 

 Larvae of H. atratum were spottily distributed, 

 occurring mostly in three clusters of stations: 

 1) between lat 15° and 20 °N in the Washington 

 pattern, 2) between lat 10° to 15°S in the Rock- 

 away pattern, and 3) an equatorial band between 

 lat 5°N and 5°S along long 119°, 112°, and 

 105°W. 



1188 



