300 



FISHERY BULLETIN OF THE FISH AND WILDLIFE SERVICE 



Table 18. — Percentage composition of the stomach con- 

 tents of longJinc-cauglit yetloirfln tuna and of the 

 catches of the (i-foot Isaiics-Kiiid trairl on John R. 

 Manning crvise 20, equatorial Pacific, lS5Ji — Continued 



Organisms ' 



June 7— Con.: 



Myctophum evermanni 



Acanthuridae 



CoUybus drachme 



Braraidae -- 



Tetraodontidae 



Balistidae - 



Echeneldae .:--- 



Exocoetidae --. 



Larval flsh___. 



Unidentified fish 



June 9: 



Longline, station 36; trawl, station 37: 3 stomachs: 



Siphonophora 



Odontodactylus sp - 



Euphausiacea 



Funchalia taaningi 



Sergestes sp -- 



HcplophOTUS typus 



H. folittceus 



Unidentified Decapoda CMollusca)-- - 



Liocranchia reiyifiardti 



Unidentified Tunicata 



Pyrosomatidae 



Salpidae - 



Astronesthes sp 



Echiosioma tannen 



Photostomias sp _ 



Diaphus sp 



Hygophum reitihardti 



Lampany^tus pyrsobolus 



Myctoplndae - - 



Nomeidae 



Acantliuridae 



Favzania laevis 



Balistidae 



Larval fish 



Unidentified fish 



June 10: 



Longline, station 38; trawl station 39; 2 stomachs: 



Siphonophora 



Euphausiacea 



Sergestes orientalis _. 



Argonautidae 



Unidentified Decapoda (Mollusca) 



Unidentified Tunicata. 



Pyrosomatidae 



Salpidae -- - 



Vincigverria lucetia 



CeratoscopeUiS townsendi 



Lampanyctus sp _-_ -.- --- 



Unidentified Myctophidae __- - - 



Diaphus sp 



Katsuwonus pelamis 



Larval fish 



Unidentified fish 



Stomach 

 contents 



Trawl 

 catch 



19 

 2 

 9 

 4 

 2 



8 

 2 

 9 

 1 

 2 



10 

 2 



10 

 2 

 2 

 2 



13 



16 



1 



31 

 2 



7 

 4 



1 



16 



' Includes all organisms or groups of organisms comprising I percent or 

 more, by volume, of the stomach contents or of the trawl catches. 



catches obtained with the 6-foot Isaacs-Kidd trawl 

 with the stomach contents of albacore tuna, 

 Thimnus germo (Lacepede), captured by long- 

 line. The fishing method, localities, and catch data 

 for these cruises are described by Shomura and 

 Otsu (1956) . The 10 albacore stomachs preserved 

 on Manning cruise 22 were from fish averaging 

 73.3 cm. in fork length, whereas the 14 stomachs 

 preserved on Manning cruise 23 were from fish 

 averaging 101.2 cm. All trawl hauls were made 

 at night between 1900 and 2030 hours. 



Although the data are sparee and do not permit 

 a station-to-station comparison, when summarized 

 over the entire cruise as in tables 19 and 20, they 

 show certain major features in common with the 



yellowfin stomach contents-trawl catch compari- 

 son (table 18). Coelenterates and crustaceans 

 made up important percentages of the volume of 

 the trawl catches but, except for Ampliipoda 

 (cruise 23), wei-e relatively insignificant in the 

 stomach contents. Of the Mollusca, Pteropoda 

 were of some importance in the trawl collections 

 whereas Cephalopoda were largely missing; this 

 situation was just reversed in the albacore food, 

 where Pteropoda were absent and Cephalopoda 

 were very important. Among the Tunicata, the 

 Pyrosomatidae were an important part of the 



Table 19. — Percentage composition of stomach contents of 

 10 albacore taken by longline and of catches of the 

 6-foot Isaacs-Kidd traiol, Manning crvise 22, central 

 Pacific, September-October 1954 



Organisms • 



Siphonophora..- 



Unidentified M'-dusae 



lepas Jasicularis (larvae) 



Lepas sp 



Phronimidae 



l^nidentified Euphausiidae.. 



Thysanopoda sp 



FunchaUfi taaningi 



Hoplophorus QTimaldii. 



Unidentified Sergestidae 



Unidentified Crustacea 



Unidentified Pteropoda 



CoTolla SP-- 



Unidentified Decapoda 



Abraliopsi^ sp 



Pyrosomatidae -- 



Salpidae 



Unidentified Myctophidae.. 



Tarletonheania sp.. -- 



Scomberesocidae; 



Colalabia sp 



Total- 



Stomach 

 contents 



Trawl 

 catch 



90 



I Includes all organisms or groups of organisms comprising 1 percent or more, 

 by volume, of the stomach contents or of the trawl catches. 



Table 20. — Percentage composition of stomach contents of 

 H albacore caught by longline and of the catches of 3 

 trawl hauls made with the G-foot Isaacs-Kidd trawl, 

 Jolin R. Manning cruise 23, central North Pacific, De- 

 cember 1954 



Organisms ' 



Siphonophora 



Unidentified Medusae 



Chaeto^natha 



Annelida 



Unidentified Amphtpoda... 



Unidentified Cnistacea 



Unidentified Decapoda 



Onycote"'thidae 



Argona'itidae 



Unidentified Cephalopoda.. 



Pyrosomatidae. 



Salpidae 



Stemoptychidae 



AlepimuTus sp 



Unidentified Myctophidae. 



Lompadena sp 



Colalahis sp 



Unidentified Pisces. 



Total- 



Stomach 

 contents 



Trawl 

 catch 



97 



' Includes all organisms or groups of organisms comprising 1 percent or 

 more, by volume, of the stomach contents or of the trawl catches. 



